CA2628492A1 - Radio frequency wave reducing material and methods for manufacturing same - Google Patents
Radio frequency wave reducing material and methods for manufacturing same Download PDFInfo
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- CA2628492A1 CA2628492A1 CA002628492A CA2628492A CA2628492A1 CA 2628492 A1 CA2628492 A1 CA 2628492A1 CA 002628492 A CA002628492 A CA 002628492A CA 2628492 A CA2628492 A CA 2628492A CA 2628492 A1 CA2628492 A1 CA 2628492A1
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- layer
- electrically conductive
- internal
- laminated structure
- panels
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0001—Rooms or chambers
- H05K9/0003—Shielded walls, floors, ceilings, e.g. wallpaper, wall panel, electro-conductive plaster, concrete, cement, mortar
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
- E04B9/045—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like being laminated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24008—Structurally defined web or sheet [e.g., overall dimension, etc.] including fastener for attaching to external surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24777—Edge feature
Abstract
An improved radio frequency wave attenuating wall (ceiling or floor) or door materi comprises a laminated structure having as an integral part thereof one or more layers of a viscoelastic material (106) which also functions as a glue and one or more electrically conducting layers (110). An electrically conducting material such as tape or a formed metal channel provides an electrical connection between the electrically conducting material and an exposed outer surface of the laminated structure. In one embodiment the electrically conducting material is paint. In one embodiment, standard wallboard, typically gypsum, comprises the external surfaces of the laminated structure and one more conductive layers are constructed between the gypsum exterior. In one embodiment, the conducting layer material is selected to provide physical security in addition to radio frequency wave attenuation. The construction is such that acoustical attenuation is also achieved
Description
RADIO FREQUENCY WAVE REDUCING MATERIAL
AND METHODS FOR MANUFACTURING SAME
CROSS REFERENCE TO RELATED APPLICATIONS
This application is related to U.S. Patent Application Number 10/658,814 filed on September 8, 2003, by Kevin J. Surace and Marc U. Porat, entitled "Acoustical Sound Proofing Material and Methods for Manufacturing Same", which is.incorporated by reference herein in its entirety.
FIELD OF THE INVENTION
This invention relates to materials for improving the security of rooms and buildings and in particular to novel laminated construction materials which reduce radio frequency ("RF") signal transmission compared to the RF signal transmission through normal building materials thereby to prevent undesired RF signal transmission from or into the protected room or building.
BACKGROUND OF THE INVENTION
The security of information, such as that transmitted by radio frequency waves, is emerging as a privacy, economic, security, and anti-terrorism issue. In spite of security technologies such as data encryption, information may be surreptitiously obtained by sensing the emissions of keyboards, wireless mouse pointing devices, computer monitors, security systems and such. Unintended listeners may receive the emissions of telephone systems outside the user's premises.
.Employees may make calls with cell phones and inadvertently transmit background sounds or conversations. Some restaurants, theaters, churches and other public places want to prevent cell pi~ones~ orpagers~'rom being used. In some cases the information represented by the signals may not be important, but the signals themselves interfere with nearby sensitive equipment. Thus it is important in many circumstances to contain emissions within, and/or to prevent emissions from penetrating, a certain room or building.
Prior solutions have typically used electrically conducting materials, such as wire mesh or sheet metal, to enclose the volume of interest. The conducting materials are mechanically and electrically connected together and then grounded.
Installation is done by building an enclosure a,layer at a time.
For example, one method in use today is to weld steel plates together on six sides of a room, with an opening for a door, typically steel. This method is labor intensive, requires a highly trained labor force, may require heavy duty material handling equipment, and the resulting structure slowly loses its RF shielding ability ove.r time as small cracks develop in the welds due to building motion and/or settling.
In areas requiring high security it is also desirable to be able to detect attempts to penetrate the protected area to, for example, install a secret listening or viewing device.
Accordingly, what is needed is a new material and a new method of construction to reduce the transmission of RF signals into or out of an enclosure which allows easier construction, does not deteriorate over time, and is tamper resistant. The ability to simultaneously reduce acoustic energy (i.e. sound) transmission from or into the enclosure is also desirable.
TI4E,"t'NVEiTTION
In accordance with this invention, a new laminated structure and associated manufacturing process is provided which significantly improves the ability of a wall, ceiling, floor or door to reduce the transmission of RF waves from or into a room.
As an added feature, the materials of this invention resist tampering.
The materials of the laminated structure of this invention are similar to those described in the aforementioned U.S. Patent Application Number 10/658,814, but with the center material (FIG. 1 and FIG. 2 of the application 10/658,814) specified to be elect,ri.cally conductive. As described in application 10/658,814, the outermost materials of the laminated structure of this invention (sometimes hereinafter referred to as a "panel".or "stack") may be gypsum, wood, or other suitable materials. Relative to the laminated structure described in application 10/658,814, one embodiment of the present invention further comprises a conductive tape which is in electrical contact with the electrically conductive center material and which extends beyond at least one end of the laminated structure by an amount which will allow the tape to be wrapped around at least one end or edge of the structure and attached to an exterior surface of the structure. When the resulting structure, which in one embodiment is typically provided in 4 x 8 foot sheets, is attached to electrically conductive metal studs by electrically conductive screws (typically metal) which penetrate the conductive center material, the panel is thereby electrically connected to the metal studs. The metal studs are electrically connected to ground potential.
In accordance with an embodiment of the invention, a strip of electrically conductive tape is used to cover the seam where two adjacent panels come together. The electrically conductive tape covering the seam is in electrical contact with the electrically conductive tape extending from the abutting edge of each panel (this last tape is further connected with the õ , ,,,,,.,. ... .....:. :....~ i, ,...:1 ~. ....~F,. ,i, elecricaly conductive center material). As a result electrical connection is provided between all of the panels so connected, as well as to the metal studs. The electrically conductive materials of the panels so connected are at essentially the same potential and when grounded or held at a fixed potential the net effect is to mitigate any impinging RF
waves. _ Walls and ceilings are typically constructed using panels having gypsum outer layers; floors and doors are typically constructed with panels having wood for the outer layers. Of course, other appropriate materials can be used for the outer layers if desired.
Another embodiment of the invention provides for room construction using wood instead of metal studs or floor joists.
The panels-are installed on the wooden studs in a similar fashion to their installation on metal studs as described above, but with one or more shorting bars located on the studs at one or more predetermined locations such that the metal screws attaching the panels to the studs will penetrate the one or more shorting bars, which in turn are grounded. In one embodiment the screws are wired together across the back side of the panels.
In another embodiment the panels are installed in at least two courses (i.e. two or more layers) wherein the panels of the second (outer) course are staggered so as to cover up the seams between the pairs of abutting panels of a first inner course.
The metal screws attaching the second course panels also penetrate the conductive layer of the panels of the first course, thereby electrically connecting all panels. By covering the seams between panels of the first course, the second course of panels prevents RF signals from leaking through the seams.
While in one embodiment tape is used to cover all seams in the multi-layer structure of panels, alternative embodiments of this invention using two or more layers of panels omit the additional strip of conductive tape between panels of the first . 4 .~... .,r.r, .r..u, ,r..rlt = 1~ .E ~F .. ..
cours or.romi' t t ~ additional strip of conductive tape between panels of the second course, or omit the additional strip of conductive tape between the panels of the first and second courses.
As an added benefit of this invention, the panel.s of this invention not only attenuate RF signals but also attenuate acoustic signals.
If desired, three or more courses of panels can be used as part of a wall or ceiling or floor and the additional strips of conductive tape which cover the seams between abutting panels of each course can be omitted selectively from one or more of the courses.
An advantage of this invention is that the panels are all electrically connected together and to ground and seams between adjacent panels in each layer of panels are sealed either by electrically conductive=tape or by an additional course of panels placed over the seams or by both tape and the additional course of panels.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention will be described in more detail in conjunction with the following detailed description taken together with the drawings.
FIG. 1 shows a laminated structure fabricated in accordance with this invention for reducing the transmission of RF through the structure.
FIG. 2 shows another embodiment of a laminated panel fabricated in accordance with this invention and a method for attachment of the panel to a metal stud.
FIG. 3 shows a method for attaching adjoining panels to a metal stud.
FIG. 4 shows a method of attaching panels to a conductive, grounded shorting bar and non-conducting studs.
FIG. 5 shows a method of attaching multiple courses of panels to metal studs.
n,,.te if., r 11 :Ir 0r ..., .. ; I :.. 14t. ~c FIGs. 6rgh 6H are graphs showing the attenuation ability of the laminated panels of this invention as a function of the frequency of the signals being attenuated.
FI.G. 7 shows an embodiment of this invention for elect-rically contacting a cut edge on a panel.
DETAILED DESCRIPTION OF THE INVENTION
Definition of terms:
DCID 6/9 A directive from the Director of the Central Intelligence (DCI) titled:
Physical Security Standards for Sensitive Compartmented Information Facilities PSA Pressure sensitive adhesive.
RF Radio frequency waves.
SCIF Sensitive Compartmented Information Facility: An accredited area, room, group of rooms, buildings, or installation where Sensitive Compartmented Information ("SCI") may be stored, used, discussed, and/or processed. SCIF performance requirements and design details are given in DCID 6/9.
WIFI "Wireless fidelity": popular term for a high-frequency wireless local area network (WLAN).
PANEL A laminated structure constructed in accordance with the present invention.
The panel may be further attached to a structure defining a room or a wall.
The structure of FIG. 1 is an example of the laminated structure of one embodiment of the present invention. The layers in the structure will be described from the top to the bottom with the structure oriented horizontally as shown. It should be understood, however, that the laminated structure of this invention will be oriented vertically when placed on vertical walls and doors, as well as horizontally or even at an angle when placed on ceilings and floors. Therefore, the reference to top and bottom layers is to be understood to refer only to these layers as oriented in FIG. 1 and not to the actual use "6f-Ehis s'tr'u"ct'ure wherein this structure may be placed vertically, horizontally, or at an angle between vertical and horizontal. A detailed discussion of the method of construction and the materials of the laminated structure of FIG. 1 and various alternative embodiments is given in the aforementioned U.S. Patent Application Number 10/658,814 and is not repeated here.
In FIG. 1, a portion of two adjacent panels 100-1 and 100-2 is shown. Note that the spaces shown between the layers and the edges of the panels are for illustrative purposes only.
References to the "center material" or "center layer", as in layer 110 of FIG. 1, are understood to mean the "electrically conductive layer" of the laminated layers of a panel, whether or not this layer is physically in the center. For example, in some embodiments the conductive layer is last in the stack of layers. As described in U.S. Patent Application Number 10/658,814, top layer 102 is glued to a center layer 110 using a thin viscoelastic adhesive 106. The material of layer 110 is selected for its electrical conduction properties. In one embodiment, the conductive material of center layer 110 is a sheet of metal, such as silicon steel plus copper. In other embodiments center layer 110 can be a copper alloy or aluminum, or a steel sheet with an adjacent copper wire mesh, mu metal or the like. The thickness of the conductive layer 110 may be as thin as foil or up to about a half-inch thick, selected for a certain purpose depending upon the degree of rigidity, acoustic damping, RF signal transmission reduction or physical security desired. In one embodiment the conductive center layer 110 is conductive paint or conductive adhesive.
A conductive tape 122, such as 3M-1345 obtained from 3M
Manufacturing, is attached to the center layer. The tape that is preferred for use with this invention to seal the cracks between abutting panels is 3M-1345 tape which is described by 3M
as "embossed tin-plated copper foil shielding tape". As described in the 3M data sheet, this tape "consists of an emboss'bd""1'-oux~':'~' 'd4e'adsoft tin-plated copper foil backing and an aggressive pressure-sensitive acrylic adhesive. The edges of the embossed pattern pressed into the foil cut through the adhesive layer to establish reliable metal-to-metal contact between the backing and the application substrate." This tape is available in standard and custom widths and lengths. Widths vary from 1/4 inch to 23 inches. This tape is intended for use in "applications requiring excellent electrical conductivity from the application substrate through the adhesive to the foil backing. Common uses include grounding and EMI shielding in equipment, components, shielded rooms ...[and similar structures]. The tin plating on the copper coil backing facilitates soldering and improves resistance to oxidation and discoloration." The 3M data sheet reports that "typical shielding effectiveness (far field) is in the range of 75dB to 95dB (30 MHz to 1 GHz)."
In accordance with this invention, the tape applied to the edges of the panels is long enough to extend completely along (i.e. to "span") each edge of a panel (such as the edge which extends perpendicular to the plane of the paper in FIG. 1) and is sufficiently wide such that a portion (122-2 and 122-3) of the tape 122 extends out from the edge far enough to be pulled around to the top surface of layer 102 as shown in FIG. 1. The conductive tape 122 may have on one surface thereof a PSA for convenience of construction. The PSA provides for the electrically conductive material of the tape to make electrical contact with a portion of a surface of electrically conductive layer 110 by rolling or otherwise applying pressure to the tape.
The conductive tape is applied to and extended along at least the major (longer) edges of a panel. In some embodiments the conductive tape is applied to all edges. In another embodiment conductive tape 122 is replaced by a metal channel or strip.
The channel or strip is sized to extend along an edge of a panel in electrically conductive contact with the center conductor 110 with a portion of the channel strip extending out from the edge a'nd ~'~ie"i'g"''tben'C""~'~"o contact the front surface, as described above and in FIG. 1 in conjunction with tape. The formed metal channel or strip is fastened to the layers of the structure using rivets, screws, PSA, or other electrically conductive attachment means.
If desired, a slight indentation can be provided in the portion of the surface of electrically conductive layer 110 to which the tape 122 or metal channel/strip is attached to make the outer surface of the tape 122 or metal channel/strip flush with the adjacent surface of layer 110.
A thin layer of viscoelastic glue 114 is applied to the lower surface of center layer 110 so as to attach the center layer 110 to,the bottom laminated layer 118. In one embodiment layers 114 and 118 are omitted so that layer 110 is visible and is one external side of the panel 100.
Upon installation, for example attaching 4 x 8 foot panels side by side to a wall, another layer 126 of conductive tape is affixed over the seam between the panels as shown in FIG. 1.
Tape 126 electrically connects the tapes 122 of adjoining panels. Of course, in'an actual structure, the tapes 122 of abutting panels will ideally be in physical contact.
The dimensions of a room utilizing panels constructed according to the invention may not be'the same as the dimensions of one or more panels. Panels may be cut to any arbitrary size.
However, such cutting exposes an edge of the laminated structure without conductive tape 122. Referring to FIG. 2, conductive tape 122 is applied to extend over and along the edge exposed by cutting the panel so as to cover completely this edge. The edges 122-3 and 122-4 of the tape 122 are bent ninety degrees (90 ) back over the panel 100 so as to electrically connect these edges to the edge-adjacent portions of the front and back surfaces of the panel 100. An electrically conductive metal screw 204 is inserted through the top portion 122-3 of tape 122, conductive layer 110, and metal stud 206, as shown in FIG. 2. A
portion 122-4 of tape 122 may extend far enough across the bott'om "o~'1'1ay~(110 in some embodiments) for screw 204 to penetrate this portion of tape 122. The center portion 122-2 of tape 122 electrically contacts the edge of center layer 110 exposed by cutting.
In one embodiment, stud 206 may be of a nonconductive material and screws 204 may be grounded by other means, such as an electrically conductive strip of material 402 (FIG. 4) extending along the face of the nonconductive stud 206 but in electrical contact with screw 204 and electrically grounded or held at a fixed potential.
FIG. 3 illustrates one installation of two panels 100-1 and 100-2 shown mounted with adjacent edges of the two panels 100-1 and 100-2 abutting and attached to a single metal stud 304. A
metal screw 204-1 attaches the laminated panel 100-1 to stud 304. Screw 204-1 penetrates center layer 110-1, thus completing an electrical connection between the center layer 110-1 and the grounded stud 304. The space shown between the edges of panels 100-1 and 100-2 is for ease of explanation and, of course, does not exist in the actual structure.
Panel 100-2 is similarly attached to stud 304 by means by metal screw 204-2. Metal screw 204-2 again penetrates through electrically conductive tape 126 and through panel center layer 110-2 of panel 100-2 extending into metal stud 304. Thus the center layer 110-1 of panel 100-1 is electrically connected via electrically conductive metal screw 204-1, electrically conductive metal stud 304 and electrically conductive metal screw 204-2 to center layer 110-2 of panel 100-2 and the two panels will be at the same electrical potential. In addition, electrically conductive tape 126 is placed over the two edges 103-1 and 103-2 of panels 100-1 and 100-2. While screws 204-1 and 204-2 are shown as having their heads external to tape 126, in an alternative embodiment these screws will have their heads covered by tape 126 and in some embodiments the heads will be countersunk into the panels 100-1 and 100-2 so that the tops of the heads are flush with the surfaces of these panels. Tape 126 wb eii1''ief1at"over these countersunk heads. Electrically conductive tapes 122-1 and 122-2 of the panels 100-1 and 100-2 will be in electrically conducting contact with each other when the panels 100-1 and 100-2 are mounted on stud 304 such that edges 103-1 and 103-2 are in physical contact with each other (i.e. directly abut). The structure of FIG. 3 thus ensures that panels 100-1 and 100-2 are electrically grounded and at the same electrical potential thereby to effectively reduce if not eliminate RF transmissions through these panels from one side to the other.
Referring to FIG. 4, in one embodiment wood studs 404 shown in side view are substituted for metal studs. A grounded conductive shorting bar 402 is arranged behind panels 100-1 and 100-2 and at least one metal screw 204 per panel 100 connects the center layer 110 (not shown) to shorting bar 402. In another embodiment at least one metal screw 204 per panel 100 is wired to ground.
In an alternative embodiment to that shown in FIG. 4, the grounded conductive shorting bar 402 can be replaced by a vertical electrically conductive shorting bar (not shown) placed along each wooden stud such that screws 204-la through 204-1g through panel 100-1 go through the electrically conductive shorting bar running parallel to and attached to the stud 404-2.
In this case, a separate electrical connection connecting each of the individual electric shorting bars can be provided although in one embodiment such electrical connection is inherently provided by center layer 110 of each panel 100.
Furthermore, as shown in FIG. 4, a plurality of metal screws 204-1a through 204-lg are used to attach panel 100-1 to center stud 404-2. Likewise, a similar plurality of electrically conductive metal screws 204-2a through 204-2g are used to attach panel 100-2 to the same stud 404-2. As shown in FIG. 4, panels 100-1 and 100-2 are attached to stud 404-2 such that the directly adjacent edges of these panels covered respectively by tapes 202-1 and 202-2 mounted along the edges of t~he 'f,i' ,n e pa'f'r"E'' as~ "t~~"~~~ribed above, directly abut and therefore are in electrically conductive.contact with each other. To ensure, however, that these tapes 202-1 and 202-2 are at the same potential, the electrically conductive screws 204-la through 204-1g and 204-2a through 204-2g connect the tapes 202-1 and 202-2 to the center layers,110-1 and 110-2 within panels 100-1 and 100-2 respectively via grounding bars. Grounding bars 402 mounted horizontally across the studs 404-1, 404-2 and 404-3 as shown in FIG. 4 are perpendicular to each of the studs 404-1 through 404-3 and ensure that the panels such as 100-1 and 100-2 are at essentially the same electrical potential at all points within the panels.
Although not shown in FIG. 4, electrically conductive tape 126 can be placed over the seam between panels 100-1 and 100-2 shown in FIG. 4 to extend along the edge portions of tapes 202-1 and 202-2 which are visible in FIG. 4 so as to cover these edge portions and the electrically conductive screws 204-la through 204-lg and 204-2a through 204-2g.
Referring to FIG. 5, an alternative construction is shown.
To further attenuate any RF which might escape through the seams between two panels assembled, for example, in accordance with FIG. 3, two courses 502 and 503 of panels are utilized. A first course 502 of panels is secured to a stud assembly (per FIG. 1 or FIG. 3) using screws 204. Tape 126 (shown over a seam between screws 204-3 and 204-4) is applied ove'r each seam and also over the heads of countersunk screws-in the middles of the second, outer, course of panels as shown in FIG. 5. In one embodiment tape 126 is omitted from the first course 502 of panels. The second, outer course 503 of panels is'secured over the first course 502. The screws 204 of the second course 503 are at least long enough to penetrate the center layer 110 of the panels of the first, inner, course 502, thereby providing an electrical connection between the two courses. The first course 502, having previously been physically and electrically connected to the studs, provides a grounding connection for the 'r P ,~ _;~ n~='r. 11.n ._. ,,..ik.. ...=f ,.a _ _. ~ ~~.
second cot~~se'3 3." In one embodiment, the screws 204 of the second course are long enough to also make a direct electrical connection with the studs 205-1, 205-2 and 205-2 and to assist in holding both courses on the studs. Conductive tape 126 is applied over the seams of adjacent panels in the second course 503. In one embodiment tape 126 is omitted.
Alternatively, tape 126 can be applied over all seams of both the first course 502 and the second course 503 if desired.
The tape 126 when so applied will be pressed by the compressive forces generated by screws 126 being extended into the underlying studs such that the resulting structure is sufficiently rigid to provide structural integrity and to attenuate if not eliminate all RF transmissions through the wall.
In some embodiments other construction is used instead of studs. For example, the invention may be practiced by placing panels which have wood or other appropriate material for their outer layers upon foam, the foam being over a concrete floor. A
foam thickness of 1-4 to '-~ inch is recommended. The panels are electrically connected to each other using in one embodiment electrically conductive strips of material placed on or in the foam as well as to the walls, all of which are held at a fixed potential, typically ground, thus providing the RF shielding effect. The foam improves the attenuation of sound. Other structures for electrically grounding the floor panels will be obvious to those skilled in the electrical arts.
The center material 110 of each panel may be selected not only for electrical properties but for physical strength as well. For example, a center material made of a certain thickness of sheet steel provides resistance to a blast, bullets, or other projectiles. Such a material also resists secretive drilling of a hole for the insertion of a sensing device, or at least makes such a penetration obvious upon inspection.
"fH eIamiri'gt"Z~'ff'-'structure described provides a panel which may be handled by two people. Depending upon the material selected for center layer 110, the panel may be cut with a conventional circular saw using blades intended for cutting wood. An RF attenuating room constructed using panels produced by practicing the invention is easier to construct and enjoys a lower total cost than equivalent solutions available today.
The laminated structure of the invention is consistent with some embodiments of the invention disclosed in U.S. Patent Application Number 10/658,814. Accordingly, panels constructed according to the present invention will attenuate sound as described in application 10/658,814.
Table 1 shows the estimated RF and acoustic attenuation provided by enclosures constructed using panels constructed in accordance with the present invention.
Table 1.
Assembly RF attenuation Acoustic Acoustic method of room Standard standard Achieved using achieved using single studs double studs Single layer up to 95 dB $TC 54 STC 66 of panels for walls, ceiling and floor Double up to 120 dB STC 60 STC 74 overlapping panels for walls, ceiling and floor Panels constructed in accordance with the present invention, using a minimum 0.011 inch thick steel plate for center material 110, are believed to be compliant with DCID6/9.
While the invention has been described in conjunction with complete panels as manufactured at the plant, in practice, panels will have to be cut on site to fit the particular sizes intended to be covered. When this is done, tape will not exist on the edge on the panel which is exposed by the cut. While FIG. 2, described above, shows one solution to this problem, another solution is shown in FIG. 7. As shown in FIG. 7, a cond'ucive'"cor'c~ 11 7''' fabricated of a mixture of butyl and nickel-coated carbon slivers or nickel filings inserted into the butyl up to about 80o by weight, is placed on the exposed metal edge of the internal electrically-conductive metal layer 110 in the panel. Once the butyl cord containing adequate conductive filings has been placed over the edge, a conductive tape 122 can then be placed over both the butyl cord and the remainder of the edge exposed by the cut. Each conductive tape 122 has one or two edge portions such as portions 122-1 and 122-3 which extend beyond the panel edge and thus can be,folded over onto the adjacent portions of the surfaces of the panel. When two panels so cut are then abutted against each other as shown in FIG. 7 (the space between the panels and the conductive tapes 122 on the edges of the panels is exaggerated for illustrative purposes) then a third conductive tape 126 can be placed over the seam between the panels 100-1 and 100-2 to electrically contact the bent edges 122-3 and 122-4 of the conductive tape on the edges thereby to ensure that the entire structure is at a fixed potential such as electrical ground. Such a structure then is highly effective in preventing the transmission of RF
signals.
The,conductive cord has been found by experiment to require approximately 80% by weight of the conductive metal filings such as conductive nickel filings or nickel-coated carbon slivers in order to be electrically conductive and thereby ensure that the internal electrically conductive metal layer 110 is at approximately the same potential (preferably ground) as the electrically conductive tape 122. Other electrically-conductive metals can also be used, if desired, in cord 127. As a result, the invention is capable of being used with cut panels as well as with prefabricated panels having the conductive tape already in contact with the internal electrically conductive layer 110.
As described above, a portion of the edge-connected conductive tape will extend beyond the panel for ease of electrical contact.
e 'etfe'ctiVeri'ess of this invention in reducing the transmissi.on of RF signals through walls is shown in FIGs. 6A
through 6H. FIGs. 6A through 6H show the attenuation as a function of frequency of the RF signal varying from 19 MHz to 10 GHz for different structures identified at the top of each figure. Thus, FIG. 6A shows the attenuation for a laminated panel with no seams and horizontal antenna polarity to range from 80 dB at approximately 20 MHz to 100 dB just below 200 MHz and then dropping to between 60 to 70 dB at 1 GHz. Beyond 1 GHz the attenuation is shown to be relatively flat with negative and positive spikes as a function of frequency.
FIG. 6B shows the attenuation for a laminated panel with no seams and vertical antenna polarity. The attenuation varies from approximately 76 dB at 20 MHz to as high as over 100 dB in the range of 100 MHz to about 180 MHz dropping in a spike back to 80 dB at 200 MHz and then remaining between 90 and 110 dB
until approximately 800 MHz thereafter dropping to approximately ~
70 dB between 1 GHz and 10 GHz.
FIG. 6C shows the RF signal attenuation for a laminated panel with a seam along the manufactured panel edges and horizontal antenna polarity. This structure shows attenuation varying from a little better than 80 dB at 20 MHz down to about 40 dB in the range of about 4-1/2 GHz to 7 GHz.
FIG. 6D shows the RF signal attenuation for a laminated panel with a seam along the manufactured panel edges with a vertical antenna polarity which has the attenuation varying from a little over 70 dB at 20 MHz to approximately 80 to 90 dB in the range o.f 100-200 MHz and then dropping to approximately between 50 dB and 60 dB in the 1 GHz to 10 GHz range.
FIG. 6E shows the RF.signal attenuation for a laminated panel with the seam along field modified panel edges and horizontal antenna polarity. The attenuation varies from between 50 dB and 60 dB for a frequency of 20 MHz to as high as 90 dB for a frequency of 200 MHz and then drops to a value of appr'ox'ima't" ely"'3"5 d$,'''attenuation for 2 GHz climbing to approximately 70 dB attenuation for between 9 GHz and 10 GHz.
FIG. 6F shows the RF signal attenuation associated with a laminated panel with a seam along field modified panel edges and vertical antenna polarity. The attenuation varies from 70 dB at 20 MHz to as high as 100 dB at approximately 200 MHz and then drops with certain spikes to as low as approximately 43 dB
between 3 and 4 GHz.
FIG. 6G shows the RF signal attenuation associated with a two-layer system of laminated panels, one continuous and one with a seam along field modified panel edges and with horizontal antenna polarity. The attenuation is shown to be much better using this structure than in some of the previous structures, varying from approximately 89 dB attenuation at 20 MHz to as high as 120 dB at 300 MHz and dropping to between 50 dB and 60 dB in the range of 2 GHz to 3 GHz and then rising again to approximately 82 dB or 83 dB at 10 GHz.
FIG 6H shows the RF signal attenuation associated with a two-layer system of laminated panels structured in accordance with this invention, one a continuous panel covering a seam in an underlying layer of panels created by abutting two field modified panel edges (such as shown in FIGs. 2 and 7) using vertical antenna polarity. The attenua.tion varies from about 77 dB at 20 MHz up to a peak of between 105 to 120+ dB at approximately 150 mHz to 170 MHz with some gradual drop to within the range of 52 dB to 70 dB for signals with a frequency of 1 GHz to 10 GHz.
As can be seen from FIGs. 6A to 6H, the structure of this invention significantly attenuates RF signals in frequency ranges commonly used with many types of communication systems.
The present disclosure is to be taken as illustrative rather thanas limiting the scope, nature, or spirit of the subject matter claimed below. Numerous modifications and variations will become apparent to those skilled in the art after studying the disclosure, including use of equivalent ~'uncori~IJ'~'~r'"11s'tructural substitutes for elements described herein, and/or use of equivalent functional steps for steps described herein. ~Such variations are to be considered within the scope of what is contemplated here. For example, while the described structures are shown as rectangular in shape, structures with other shapes, such as circular, hexagonal or other polygonal shapes can also be used, if required or appropriate. This invention is not limited to any particular shape.
Thus the invention is not limited to the embodiments described above.
The following claims are not to be taken as limiting Applicant's right to claim disclosed, but not yet literally claimed subject matter by way of one or more further applications including those filed pursuant to 35 U.S.C. 120 and/or 35 U.S.C. 251.
AND METHODS FOR MANUFACTURING SAME
CROSS REFERENCE TO RELATED APPLICATIONS
This application is related to U.S. Patent Application Number 10/658,814 filed on September 8, 2003, by Kevin J. Surace and Marc U. Porat, entitled "Acoustical Sound Proofing Material and Methods for Manufacturing Same", which is.incorporated by reference herein in its entirety.
FIELD OF THE INVENTION
This invention relates to materials for improving the security of rooms and buildings and in particular to novel laminated construction materials which reduce radio frequency ("RF") signal transmission compared to the RF signal transmission through normal building materials thereby to prevent undesired RF signal transmission from or into the protected room or building.
BACKGROUND OF THE INVENTION
The security of information, such as that transmitted by radio frequency waves, is emerging as a privacy, economic, security, and anti-terrorism issue. In spite of security technologies such as data encryption, information may be surreptitiously obtained by sensing the emissions of keyboards, wireless mouse pointing devices, computer monitors, security systems and such. Unintended listeners may receive the emissions of telephone systems outside the user's premises.
.Employees may make calls with cell phones and inadvertently transmit background sounds or conversations. Some restaurants, theaters, churches and other public places want to prevent cell pi~ones~ orpagers~'rom being used. In some cases the information represented by the signals may not be important, but the signals themselves interfere with nearby sensitive equipment. Thus it is important in many circumstances to contain emissions within, and/or to prevent emissions from penetrating, a certain room or building.
Prior solutions have typically used electrically conducting materials, such as wire mesh or sheet metal, to enclose the volume of interest. The conducting materials are mechanically and electrically connected together and then grounded.
Installation is done by building an enclosure a,layer at a time.
For example, one method in use today is to weld steel plates together on six sides of a room, with an opening for a door, typically steel. This method is labor intensive, requires a highly trained labor force, may require heavy duty material handling equipment, and the resulting structure slowly loses its RF shielding ability ove.r time as small cracks develop in the welds due to building motion and/or settling.
In areas requiring high security it is also desirable to be able to detect attempts to penetrate the protected area to, for example, install a secret listening or viewing device.
Accordingly, what is needed is a new material and a new method of construction to reduce the transmission of RF signals into or out of an enclosure which allows easier construction, does not deteriorate over time, and is tamper resistant. The ability to simultaneously reduce acoustic energy (i.e. sound) transmission from or into the enclosure is also desirable.
TI4E,"t'NVEiTTION
In accordance with this invention, a new laminated structure and associated manufacturing process is provided which significantly improves the ability of a wall, ceiling, floor or door to reduce the transmission of RF waves from or into a room.
As an added feature, the materials of this invention resist tampering.
The materials of the laminated structure of this invention are similar to those described in the aforementioned U.S. Patent Application Number 10/658,814, but with the center material (FIG. 1 and FIG. 2 of the application 10/658,814) specified to be elect,ri.cally conductive. As described in application 10/658,814, the outermost materials of the laminated structure of this invention (sometimes hereinafter referred to as a "panel".or "stack") may be gypsum, wood, or other suitable materials. Relative to the laminated structure described in application 10/658,814, one embodiment of the present invention further comprises a conductive tape which is in electrical contact with the electrically conductive center material and which extends beyond at least one end of the laminated structure by an amount which will allow the tape to be wrapped around at least one end or edge of the structure and attached to an exterior surface of the structure. When the resulting structure, which in one embodiment is typically provided in 4 x 8 foot sheets, is attached to electrically conductive metal studs by electrically conductive screws (typically metal) which penetrate the conductive center material, the panel is thereby electrically connected to the metal studs. The metal studs are electrically connected to ground potential.
In accordance with an embodiment of the invention, a strip of electrically conductive tape is used to cover the seam where two adjacent panels come together. The electrically conductive tape covering the seam is in electrical contact with the electrically conductive tape extending from the abutting edge of each panel (this last tape is further connected with the õ , ,,,,,.,. ... .....:. :....~ i, ,...:1 ~. ....~F,. ,i, elecricaly conductive center material). As a result electrical connection is provided between all of the panels so connected, as well as to the metal studs. The electrically conductive materials of the panels so connected are at essentially the same potential and when grounded or held at a fixed potential the net effect is to mitigate any impinging RF
waves. _ Walls and ceilings are typically constructed using panels having gypsum outer layers; floors and doors are typically constructed with panels having wood for the outer layers. Of course, other appropriate materials can be used for the outer layers if desired.
Another embodiment of the invention provides for room construction using wood instead of metal studs or floor joists.
The panels-are installed on the wooden studs in a similar fashion to their installation on metal studs as described above, but with one or more shorting bars located on the studs at one or more predetermined locations such that the metal screws attaching the panels to the studs will penetrate the one or more shorting bars, which in turn are grounded. In one embodiment the screws are wired together across the back side of the panels.
In another embodiment the panels are installed in at least two courses (i.e. two or more layers) wherein the panels of the second (outer) course are staggered so as to cover up the seams between the pairs of abutting panels of a first inner course.
The metal screws attaching the second course panels also penetrate the conductive layer of the panels of the first course, thereby electrically connecting all panels. By covering the seams between panels of the first course, the second course of panels prevents RF signals from leaking through the seams.
While in one embodiment tape is used to cover all seams in the multi-layer structure of panels, alternative embodiments of this invention using two or more layers of panels omit the additional strip of conductive tape between panels of the first . 4 .~... .,r.r, .r..u, ,r..rlt = 1~ .E ~F .. ..
cours or.romi' t t ~ additional strip of conductive tape between panels of the second course, or omit the additional strip of conductive tape between the panels of the first and second courses.
As an added benefit of this invention, the panel.s of this invention not only attenuate RF signals but also attenuate acoustic signals.
If desired, three or more courses of panels can be used as part of a wall or ceiling or floor and the additional strips of conductive tape which cover the seams between abutting panels of each course can be omitted selectively from one or more of the courses.
An advantage of this invention is that the panels are all electrically connected together and to ground and seams between adjacent panels in each layer of panels are sealed either by electrically conductive=tape or by an additional course of panels placed over the seams or by both tape and the additional course of panels.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention will be described in more detail in conjunction with the following detailed description taken together with the drawings.
FIG. 1 shows a laminated structure fabricated in accordance with this invention for reducing the transmission of RF through the structure.
FIG. 2 shows another embodiment of a laminated panel fabricated in accordance with this invention and a method for attachment of the panel to a metal stud.
FIG. 3 shows a method for attaching adjoining panels to a metal stud.
FIG. 4 shows a method of attaching panels to a conductive, grounded shorting bar and non-conducting studs.
FIG. 5 shows a method of attaching multiple courses of panels to metal studs.
n,,.te if., r 11 :Ir 0r ..., .. ; I :.. 14t. ~c FIGs. 6rgh 6H are graphs showing the attenuation ability of the laminated panels of this invention as a function of the frequency of the signals being attenuated.
FI.G. 7 shows an embodiment of this invention for elect-rically contacting a cut edge on a panel.
DETAILED DESCRIPTION OF THE INVENTION
Definition of terms:
DCID 6/9 A directive from the Director of the Central Intelligence (DCI) titled:
Physical Security Standards for Sensitive Compartmented Information Facilities PSA Pressure sensitive adhesive.
RF Radio frequency waves.
SCIF Sensitive Compartmented Information Facility: An accredited area, room, group of rooms, buildings, or installation where Sensitive Compartmented Information ("SCI") may be stored, used, discussed, and/or processed. SCIF performance requirements and design details are given in DCID 6/9.
WIFI "Wireless fidelity": popular term for a high-frequency wireless local area network (WLAN).
PANEL A laminated structure constructed in accordance with the present invention.
The panel may be further attached to a structure defining a room or a wall.
The structure of FIG. 1 is an example of the laminated structure of one embodiment of the present invention. The layers in the structure will be described from the top to the bottom with the structure oriented horizontally as shown. It should be understood, however, that the laminated structure of this invention will be oriented vertically when placed on vertical walls and doors, as well as horizontally or even at an angle when placed on ceilings and floors. Therefore, the reference to top and bottom layers is to be understood to refer only to these layers as oriented in FIG. 1 and not to the actual use "6f-Ehis s'tr'u"ct'ure wherein this structure may be placed vertically, horizontally, or at an angle between vertical and horizontal. A detailed discussion of the method of construction and the materials of the laminated structure of FIG. 1 and various alternative embodiments is given in the aforementioned U.S. Patent Application Number 10/658,814 and is not repeated here.
In FIG. 1, a portion of two adjacent panels 100-1 and 100-2 is shown. Note that the spaces shown between the layers and the edges of the panels are for illustrative purposes only.
References to the "center material" or "center layer", as in layer 110 of FIG. 1, are understood to mean the "electrically conductive layer" of the laminated layers of a panel, whether or not this layer is physically in the center. For example, in some embodiments the conductive layer is last in the stack of layers. As described in U.S. Patent Application Number 10/658,814, top layer 102 is glued to a center layer 110 using a thin viscoelastic adhesive 106. The material of layer 110 is selected for its electrical conduction properties. In one embodiment, the conductive material of center layer 110 is a sheet of metal, such as silicon steel plus copper. In other embodiments center layer 110 can be a copper alloy or aluminum, or a steel sheet with an adjacent copper wire mesh, mu metal or the like. The thickness of the conductive layer 110 may be as thin as foil or up to about a half-inch thick, selected for a certain purpose depending upon the degree of rigidity, acoustic damping, RF signal transmission reduction or physical security desired. In one embodiment the conductive center layer 110 is conductive paint or conductive adhesive.
A conductive tape 122, such as 3M-1345 obtained from 3M
Manufacturing, is attached to the center layer. The tape that is preferred for use with this invention to seal the cracks between abutting panels is 3M-1345 tape which is described by 3M
as "embossed tin-plated copper foil shielding tape". As described in the 3M data sheet, this tape "consists of an emboss'bd""1'-oux~':'~' 'd4e'adsoft tin-plated copper foil backing and an aggressive pressure-sensitive acrylic adhesive. The edges of the embossed pattern pressed into the foil cut through the adhesive layer to establish reliable metal-to-metal contact between the backing and the application substrate." This tape is available in standard and custom widths and lengths. Widths vary from 1/4 inch to 23 inches. This tape is intended for use in "applications requiring excellent electrical conductivity from the application substrate through the adhesive to the foil backing. Common uses include grounding and EMI shielding in equipment, components, shielded rooms ...[and similar structures]. The tin plating on the copper coil backing facilitates soldering and improves resistance to oxidation and discoloration." The 3M data sheet reports that "typical shielding effectiveness (far field) is in the range of 75dB to 95dB (30 MHz to 1 GHz)."
In accordance with this invention, the tape applied to the edges of the panels is long enough to extend completely along (i.e. to "span") each edge of a panel (such as the edge which extends perpendicular to the plane of the paper in FIG. 1) and is sufficiently wide such that a portion (122-2 and 122-3) of the tape 122 extends out from the edge far enough to be pulled around to the top surface of layer 102 as shown in FIG. 1. The conductive tape 122 may have on one surface thereof a PSA for convenience of construction. The PSA provides for the electrically conductive material of the tape to make electrical contact with a portion of a surface of electrically conductive layer 110 by rolling or otherwise applying pressure to the tape.
The conductive tape is applied to and extended along at least the major (longer) edges of a panel. In some embodiments the conductive tape is applied to all edges. In another embodiment conductive tape 122 is replaced by a metal channel or strip.
The channel or strip is sized to extend along an edge of a panel in electrically conductive contact with the center conductor 110 with a portion of the channel strip extending out from the edge a'nd ~'~ie"i'g"''tben'C""~'~"o contact the front surface, as described above and in FIG. 1 in conjunction with tape. The formed metal channel or strip is fastened to the layers of the structure using rivets, screws, PSA, or other electrically conductive attachment means.
If desired, a slight indentation can be provided in the portion of the surface of electrically conductive layer 110 to which the tape 122 or metal channel/strip is attached to make the outer surface of the tape 122 or metal channel/strip flush with the adjacent surface of layer 110.
A thin layer of viscoelastic glue 114 is applied to the lower surface of center layer 110 so as to attach the center layer 110 to,the bottom laminated layer 118. In one embodiment layers 114 and 118 are omitted so that layer 110 is visible and is one external side of the panel 100.
Upon installation, for example attaching 4 x 8 foot panels side by side to a wall, another layer 126 of conductive tape is affixed over the seam between the panels as shown in FIG. 1.
Tape 126 electrically connects the tapes 122 of adjoining panels. Of course, in'an actual structure, the tapes 122 of abutting panels will ideally be in physical contact.
The dimensions of a room utilizing panels constructed according to the invention may not be'the same as the dimensions of one or more panels. Panels may be cut to any arbitrary size.
However, such cutting exposes an edge of the laminated structure without conductive tape 122. Referring to FIG. 2, conductive tape 122 is applied to extend over and along the edge exposed by cutting the panel so as to cover completely this edge. The edges 122-3 and 122-4 of the tape 122 are bent ninety degrees (90 ) back over the panel 100 so as to electrically connect these edges to the edge-adjacent portions of the front and back surfaces of the panel 100. An electrically conductive metal screw 204 is inserted through the top portion 122-3 of tape 122, conductive layer 110, and metal stud 206, as shown in FIG. 2. A
portion 122-4 of tape 122 may extend far enough across the bott'om "o~'1'1ay~(110 in some embodiments) for screw 204 to penetrate this portion of tape 122. The center portion 122-2 of tape 122 electrically contacts the edge of center layer 110 exposed by cutting.
In one embodiment, stud 206 may be of a nonconductive material and screws 204 may be grounded by other means, such as an electrically conductive strip of material 402 (FIG. 4) extending along the face of the nonconductive stud 206 but in electrical contact with screw 204 and electrically grounded or held at a fixed potential.
FIG. 3 illustrates one installation of two panels 100-1 and 100-2 shown mounted with adjacent edges of the two panels 100-1 and 100-2 abutting and attached to a single metal stud 304. A
metal screw 204-1 attaches the laminated panel 100-1 to stud 304. Screw 204-1 penetrates center layer 110-1, thus completing an electrical connection between the center layer 110-1 and the grounded stud 304. The space shown between the edges of panels 100-1 and 100-2 is for ease of explanation and, of course, does not exist in the actual structure.
Panel 100-2 is similarly attached to stud 304 by means by metal screw 204-2. Metal screw 204-2 again penetrates through electrically conductive tape 126 and through panel center layer 110-2 of panel 100-2 extending into metal stud 304. Thus the center layer 110-1 of panel 100-1 is electrically connected via electrically conductive metal screw 204-1, electrically conductive metal stud 304 and electrically conductive metal screw 204-2 to center layer 110-2 of panel 100-2 and the two panels will be at the same electrical potential. In addition, electrically conductive tape 126 is placed over the two edges 103-1 and 103-2 of panels 100-1 and 100-2. While screws 204-1 and 204-2 are shown as having their heads external to tape 126, in an alternative embodiment these screws will have their heads covered by tape 126 and in some embodiments the heads will be countersunk into the panels 100-1 and 100-2 so that the tops of the heads are flush with the surfaces of these panels. Tape 126 wb eii1''ief1at"over these countersunk heads. Electrically conductive tapes 122-1 and 122-2 of the panels 100-1 and 100-2 will be in electrically conducting contact with each other when the panels 100-1 and 100-2 are mounted on stud 304 such that edges 103-1 and 103-2 are in physical contact with each other (i.e. directly abut). The structure of FIG. 3 thus ensures that panels 100-1 and 100-2 are electrically grounded and at the same electrical potential thereby to effectively reduce if not eliminate RF transmissions through these panels from one side to the other.
Referring to FIG. 4, in one embodiment wood studs 404 shown in side view are substituted for metal studs. A grounded conductive shorting bar 402 is arranged behind panels 100-1 and 100-2 and at least one metal screw 204 per panel 100 connects the center layer 110 (not shown) to shorting bar 402. In another embodiment at least one metal screw 204 per panel 100 is wired to ground.
In an alternative embodiment to that shown in FIG. 4, the grounded conductive shorting bar 402 can be replaced by a vertical electrically conductive shorting bar (not shown) placed along each wooden stud such that screws 204-la through 204-1g through panel 100-1 go through the electrically conductive shorting bar running parallel to and attached to the stud 404-2.
In this case, a separate electrical connection connecting each of the individual electric shorting bars can be provided although in one embodiment such electrical connection is inherently provided by center layer 110 of each panel 100.
Furthermore, as shown in FIG. 4, a plurality of metal screws 204-1a through 204-lg are used to attach panel 100-1 to center stud 404-2. Likewise, a similar plurality of electrically conductive metal screws 204-2a through 204-2g are used to attach panel 100-2 to the same stud 404-2. As shown in FIG. 4, panels 100-1 and 100-2 are attached to stud 404-2 such that the directly adjacent edges of these panels covered respectively by tapes 202-1 and 202-2 mounted along the edges of t~he 'f,i' ,n e pa'f'r"E'' as~ "t~~"~~~ribed above, directly abut and therefore are in electrically conductive.contact with each other. To ensure, however, that these tapes 202-1 and 202-2 are at the same potential, the electrically conductive screws 204-la through 204-1g and 204-2a through 204-2g connect the tapes 202-1 and 202-2 to the center layers,110-1 and 110-2 within panels 100-1 and 100-2 respectively via grounding bars. Grounding bars 402 mounted horizontally across the studs 404-1, 404-2 and 404-3 as shown in FIG. 4 are perpendicular to each of the studs 404-1 through 404-3 and ensure that the panels such as 100-1 and 100-2 are at essentially the same electrical potential at all points within the panels.
Although not shown in FIG. 4, electrically conductive tape 126 can be placed over the seam between panels 100-1 and 100-2 shown in FIG. 4 to extend along the edge portions of tapes 202-1 and 202-2 which are visible in FIG. 4 so as to cover these edge portions and the electrically conductive screws 204-la through 204-lg and 204-2a through 204-2g.
Referring to FIG. 5, an alternative construction is shown.
To further attenuate any RF which might escape through the seams between two panels assembled, for example, in accordance with FIG. 3, two courses 502 and 503 of panels are utilized. A first course 502 of panels is secured to a stud assembly (per FIG. 1 or FIG. 3) using screws 204. Tape 126 (shown over a seam between screws 204-3 and 204-4) is applied ove'r each seam and also over the heads of countersunk screws-in the middles of the second, outer, course of panels as shown in FIG. 5. In one embodiment tape 126 is omitted from the first course 502 of panels. The second, outer course 503 of panels is'secured over the first course 502. The screws 204 of the second course 503 are at least long enough to penetrate the center layer 110 of the panels of the first, inner, course 502, thereby providing an electrical connection between the two courses. The first course 502, having previously been physically and electrically connected to the studs, provides a grounding connection for the 'r P ,~ _;~ n~='r. 11.n ._. ,,..ik.. ...=f ,.a _ _. ~ ~~.
second cot~~se'3 3." In one embodiment, the screws 204 of the second course are long enough to also make a direct electrical connection with the studs 205-1, 205-2 and 205-2 and to assist in holding both courses on the studs. Conductive tape 126 is applied over the seams of adjacent panels in the second course 503. In one embodiment tape 126 is omitted.
Alternatively, tape 126 can be applied over all seams of both the first course 502 and the second course 503 if desired.
The tape 126 when so applied will be pressed by the compressive forces generated by screws 126 being extended into the underlying studs such that the resulting structure is sufficiently rigid to provide structural integrity and to attenuate if not eliminate all RF transmissions through the wall.
In some embodiments other construction is used instead of studs. For example, the invention may be practiced by placing panels which have wood or other appropriate material for their outer layers upon foam, the foam being over a concrete floor. A
foam thickness of 1-4 to '-~ inch is recommended. The panels are electrically connected to each other using in one embodiment electrically conductive strips of material placed on or in the foam as well as to the walls, all of which are held at a fixed potential, typically ground, thus providing the RF shielding effect. The foam improves the attenuation of sound. Other structures for electrically grounding the floor panels will be obvious to those skilled in the electrical arts.
The center material 110 of each panel may be selected not only for electrical properties but for physical strength as well. For example, a center material made of a certain thickness of sheet steel provides resistance to a blast, bullets, or other projectiles. Such a material also resists secretive drilling of a hole for the insertion of a sensing device, or at least makes such a penetration obvious upon inspection.
"fH eIamiri'gt"Z~'ff'-'structure described provides a panel which may be handled by two people. Depending upon the material selected for center layer 110, the panel may be cut with a conventional circular saw using blades intended for cutting wood. An RF attenuating room constructed using panels produced by practicing the invention is easier to construct and enjoys a lower total cost than equivalent solutions available today.
The laminated structure of the invention is consistent with some embodiments of the invention disclosed in U.S. Patent Application Number 10/658,814. Accordingly, panels constructed according to the present invention will attenuate sound as described in application 10/658,814.
Table 1 shows the estimated RF and acoustic attenuation provided by enclosures constructed using panels constructed in accordance with the present invention.
Table 1.
Assembly RF attenuation Acoustic Acoustic method of room Standard standard Achieved using achieved using single studs double studs Single layer up to 95 dB $TC 54 STC 66 of panels for walls, ceiling and floor Double up to 120 dB STC 60 STC 74 overlapping panels for walls, ceiling and floor Panels constructed in accordance with the present invention, using a minimum 0.011 inch thick steel plate for center material 110, are believed to be compliant with DCID6/9.
While the invention has been described in conjunction with complete panels as manufactured at the plant, in practice, panels will have to be cut on site to fit the particular sizes intended to be covered. When this is done, tape will not exist on the edge on the panel which is exposed by the cut. While FIG. 2, described above, shows one solution to this problem, another solution is shown in FIG. 7. As shown in FIG. 7, a cond'ucive'"cor'c~ 11 7''' fabricated of a mixture of butyl and nickel-coated carbon slivers or nickel filings inserted into the butyl up to about 80o by weight, is placed on the exposed metal edge of the internal electrically-conductive metal layer 110 in the panel. Once the butyl cord containing adequate conductive filings has been placed over the edge, a conductive tape 122 can then be placed over both the butyl cord and the remainder of the edge exposed by the cut. Each conductive tape 122 has one or two edge portions such as portions 122-1 and 122-3 which extend beyond the panel edge and thus can be,folded over onto the adjacent portions of the surfaces of the panel. When two panels so cut are then abutted against each other as shown in FIG. 7 (the space between the panels and the conductive tapes 122 on the edges of the panels is exaggerated for illustrative purposes) then a third conductive tape 126 can be placed over the seam between the panels 100-1 and 100-2 to electrically contact the bent edges 122-3 and 122-4 of the conductive tape on the edges thereby to ensure that the entire structure is at a fixed potential such as electrical ground. Such a structure then is highly effective in preventing the transmission of RF
signals.
The,conductive cord has been found by experiment to require approximately 80% by weight of the conductive metal filings such as conductive nickel filings or nickel-coated carbon slivers in order to be electrically conductive and thereby ensure that the internal electrically conductive metal layer 110 is at approximately the same potential (preferably ground) as the electrically conductive tape 122. Other electrically-conductive metals can also be used, if desired, in cord 127. As a result, the invention is capable of being used with cut panels as well as with prefabricated panels having the conductive tape already in contact with the internal electrically conductive layer 110.
As described above, a portion of the edge-connected conductive tape will extend beyond the panel for ease of electrical contact.
e 'etfe'ctiVeri'ess of this invention in reducing the transmissi.on of RF signals through walls is shown in FIGs. 6A
through 6H. FIGs. 6A through 6H show the attenuation as a function of frequency of the RF signal varying from 19 MHz to 10 GHz for different structures identified at the top of each figure. Thus, FIG. 6A shows the attenuation for a laminated panel with no seams and horizontal antenna polarity to range from 80 dB at approximately 20 MHz to 100 dB just below 200 MHz and then dropping to between 60 to 70 dB at 1 GHz. Beyond 1 GHz the attenuation is shown to be relatively flat with negative and positive spikes as a function of frequency.
FIG. 6B shows the attenuation for a laminated panel with no seams and vertical antenna polarity. The attenuation varies from approximately 76 dB at 20 MHz to as high as over 100 dB in the range of 100 MHz to about 180 MHz dropping in a spike back to 80 dB at 200 MHz and then remaining between 90 and 110 dB
until approximately 800 MHz thereafter dropping to approximately ~
70 dB between 1 GHz and 10 GHz.
FIG. 6C shows the RF signal attenuation for a laminated panel with a seam along the manufactured panel edges and horizontal antenna polarity. This structure shows attenuation varying from a little better than 80 dB at 20 MHz down to about 40 dB in the range of about 4-1/2 GHz to 7 GHz.
FIG. 6D shows the RF signal attenuation for a laminated panel with a seam along the manufactured panel edges with a vertical antenna polarity which has the attenuation varying from a little over 70 dB at 20 MHz to approximately 80 to 90 dB in the range o.f 100-200 MHz and then dropping to approximately between 50 dB and 60 dB in the 1 GHz to 10 GHz range.
FIG. 6E shows the RF.signal attenuation for a laminated panel with the seam along field modified panel edges and horizontal antenna polarity. The attenuation varies from between 50 dB and 60 dB for a frequency of 20 MHz to as high as 90 dB for a frequency of 200 MHz and then drops to a value of appr'ox'ima't" ely"'3"5 d$,'''attenuation for 2 GHz climbing to approximately 70 dB attenuation for between 9 GHz and 10 GHz.
FIG. 6F shows the RF signal attenuation associated with a laminated panel with a seam along field modified panel edges and vertical antenna polarity. The attenuation varies from 70 dB at 20 MHz to as high as 100 dB at approximately 200 MHz and then drops with certain spikes to as low as approximately 43 dB
between 3 and 4 GHz.
FIG. 6G shows the RF signal attenuation associated with a two-layer system of laminated panels, one continuous and one with a seam along field modified panel edges and with horizontal antenna polarity. The attenuation is shown to be much better using this structure than in some of the previous structures, varying from approximately 89 dB attenuation at 20 MHz to as high as 120 dB at 300 MHz and dropping to between 50 dB and 60 dB in the range of 2 GHz to 3 GHz and then rising again to approximately 82 dB or 83 dB at 10 GHz.
FIG 6H shows the RF signal attenuation associated with a two-layer system of laminated panels structured in accordance with this invention, one a continuous panel covering a seam in an underlying layer of panels created by abutting two field modified panel edges (such as shown in FIGs. 2 and 7) using vertical antenna polarity. The attenua.tion varies from about 77 dB at 20 MHz up to a peak of between 105 to 120+ dB at approximately 150 mHz to 170 MHz with some gradual drop to within the range of 52 dB to 70 dB for signals with a frequency of 1 GHz to 10 GHz.
As can be seen from FIGs. 6A to 6H, the structure of this invention significantly attenuates RF signals in frequency ranges commonly used with many types of communication systems.
The present disclosure is to be taken as illustrative rather thanas limiting the scope, nature, or spirit of the subject matter claimed below. Numerous modifications and variations will become apparent to those skilled in the art after studying the disclosure, including use of equivalent ~'uncori~IJ'~'~r'"11s'tructural substitutes for elements described herein, and/or use of equivalent functional steps for steps described herein. ~Such variations are to be considered within the scope of what is contemplated here. For example, while the described structures are shown as rectangular in shape, structures with other shapes, such as circular, hexagonal or other polygonal shapes can also be used, if required or appropriate. This invention is not limited to any particular shape.
Thus the invention is not limited to the embodiments described above.
The following claims are not to be taken as limiting Applicant's right to claim disclosed, but not yet literally claimed subject matter by way of one or more further applications including those filed pursuant to 35 U.S.C. 120 and/or 35 U.S.C. 251.
Claims (58)
1. A laminated structure used for constructing RF
attenuating walls, floors, or ceilings comprising:
two external layers of a material;
at least one internal electrically conductive constraining layer;
two or more internal layers of a viscoelastic glue separated by said at least one internal electrically conductive constraining layer; and an electrically conductive tape in electrical contact with said electrically conductive constraining layer and extending out from at least one edge of said structure.
attenuating walls, floors, or ceilings comprising:
two external layers of a material;
at least one internal electrically conductive constraining layer;
two or more internal layers of a viscoelastic glue separated by said at least one internal electrically conductive constraining layer; and an electrically conductive tape in electrical contact with said electrically conductive constraining layer and extending out from at least one edge of said structure.
2. A laminated structure as in claim 1, wherein the constraining layer comprises metal.
3. A laminated structure as in claim 1, wherein said two external layers each comprise a selected thickness gypsum board layer.
4. A laminated structure as in claim 3, wherein said glue comprises a viscoelastic material capable of damping sound.
5. A laminated structure as in claim 4, wherein said internal metal layer comprises a sheet metal layer of selected thickness.
6. A laminated structure as in claim 5, wherein said internal metal layer comprises a sheet metal layer of selected thickness selected to re'sist physical tampering.
7. A laminated structure as in claim 5, wherein said sheet metal layer of selected thickness comprises galvanized steel.
8. A laminated structure as in claim 1, wherein at least one of said two external layers comprises a selected thickness wood layer.
9. A laminated structure as in claim 8, wherein said glue comprises a viscoelastic material capable of damping sound.
10. A laminated structure as in claim 9, wherein said internal metal layer comprises a sheet metal layer of selected thickness.
11. A laminated structure as in claim 10, wherein said internal metal layer comprises a sheet metal layer of selected thickness selected to resist physical tampering.
12. A laminated structure as in claim 10, wherein said sheet metal layer of selected thickness comprises galvanized steel.
13. A laminated structure having four edges used for constructing RF attenuating walls, floors, or ceilings comprising:
at least one internal layer of a selected material;
two internal layers of a viscoelastic glue, one such layer on each side of said internal layer;
at least one additional layer of material on the exposed side of each internal layer of viscoelastic glue;
and an external conductive tape which is in electrical contact with the internal constraining layer extending along at least one of said edges and having a portion of said tape extending out from said at least one edge.
at least one internal layer of a selected material;
two internal layers of a viscoelastic glue, one such layer on each side of said internal layer;
at least one additional layer of material on the exposed side of each internal layer of viscoelastic glue;
and an external conductive tape which is in electrical contact with the internal constraining layer extending along at least one of said edges and having a portion of said tape extending out from said at least one edge.
14. A laminated structure as in claim 13, wherein the constraining layer comprises metal.
15. A laminated structure as in claim 13, wherein at least one of said two external layers comprises a selected thickness gypsum board layer.
16. A laminated structure as in claim 15, wherein said glue comprises a viscoelastic material capable of damping sound.
17. A laminated structure as in claim 16, wherein said internal metal layer comprises a sheet metal layer of selected thickness.
18. A laminated structure as in claim 17, wherein said internal metal layer comprises a sheet metal layer of selected thickness selected to resist physical tampering.
19. A laminated structure as in claim 17, wherein said sheet metal layer of selected thickness comprises galvanized steel.
20. A laminated structure as in claim 13, wherein at least one of said two external layers comprises a selected thickness wood layer.
21. A laminated structure as in claim 20, wherein said glue comprises a viscoelastic material capable of damping sound.
22. A laminated structure as in claim 21, wherein said internal metal layer comprises a sheet metal layer of selected thickness
23. A laminated structure as in claim 22, wherein said internal metal layer comprises a sheet metal layer of selected thickness selected to resist physical tampering.
24. A laminated structure as in claim 22, wherein said sheet metal layer of selected thickness comprises galvanized steel.
25. The method of forming a laminated structure capable of being used for constructing RF attenuating walls, floors, or ceilings which comprises:
providing a layer of first material having two surfaces, said layer of first material being electrically conductive and capable of attenuating RF signals;
placing a layer of viscoelastic glue onto one surface of said layer of first material;
placing a layer of a second material over said viscoelastic glue;
pressing said layer of second material against said layer of viscoelastic glue and said layer of first material for a selected time;
drying said layer of second material, said layer of first material and said viscoelastic glue; and attaching an electrically conductive tape to at least one edge of said layer of first material such that a portion of said electrically conductive tape can be bent to attach to at least a portion of one surface of said structure.
providing a layer of first material having two surfaces, said layer of first material being electrically conductive and capable of attenuating RF signals;
placing a layer of viscoelastic glue onto one surface of said layer of first material;
placing a layer of a second material over said viscoelastic glue;
pressing said layer of second material against said layer of viscoelastic glue and said layer of first material for a selected time;
drying said layer of second material, said layer of first material and said viscoelastic glue; and attaching an electrically conductive tape to at least one edge of said layer of first material such that a portion of said electrically conductive tape can be bent to attach to at least a portion of one surface of said structure.
26. The method of claim 25, including:
providing an internal layer of material or multiple layers of selected materials;
forming a layer of viscoelastic glue on each of what are to be internal surfaces of two or more laminar structures;
placing two or more such laminar structures with the two or more to-be internal surfaces adjacent said internal layer or said multiple layers;
pressing the composite structure formed in the preceding step at a selected pressure for a selected time;
and drying the composite structure being pressed.
providing an internal layer of material or multiple layers of selected materials;
forming a layer of viscoelastic glue on each of what are to be internal surfaces of two or more laminar structures;
placing two or more such laminar structures with the two or more to-be internal surfaces adjacent said internal layer or said multiple layers;
pressing the composite structure formed in the preceding step at a selected pressure for a selected time;
and drying the composite structure being pressed.
27. The method of claim 25 wherein said first material comprises a metal layer, and said second material comprises a gypsum layer.
28. The method of claim 25 wherein said first material comprises a tamper-resistant metal layer, and said second material comprises a gypsum layer.
29. The method of claim 25 wherein said first material comprises a metal layer, and said second material comprises a wood layer.
30. The method of claim 25 wherein said first material comprises a tamper-resistant metal layer, and said second material comprises a wood layer.
31. The method of claim 27 wherein said internal layer comprises a metal layer selected from the group consisting of galvanized steel, stainless steel, aluminum, titanium, and a composite of two or more metals.
32. The method of claim 27 wherein said metal layer comprises galvanized steel.
33. The method of claim 28 wherein said internal layer comprises a metal layer selected from the group consisting of galvanized steel, stainless steel, aluminum, titanium, and a composite of two or more metals.
34. The method of claim 28 wherein said metal layer comprises galvanized steel.
35. The method of claim 29 wherein said internal layer comprises a metal layer selected from the group consisting of galvanized steel, stainless steel, aluminum, titanium, and a composite of two or more metals.
36. The method of claim 29 wherein said metal layer comprises galvanized steel.
37. The method of forming a laminated structure having four edges used for constructing RF attenuating walls, floors, or ceilings which comprises:
providing a layer of first material having two surfaces;
placing a layer of viscoelastic glue onto one surface of said layer of first material;
placing a layer of an electrically conductive second material, which is 1/100th to 1/2 the thickness of the first material over said viscoelastic glue;
pressing said layer of second material against said layer of viscoelastic glue and said first material for a selected time;
drying said layer of second material, said layer of first material and said viscoelastic glue; and attaching an electrically-conductive tape to the edge of a portion of the electrically conductive second material such that a portion of the tape extends beyond the edge.
providing a layer of first material having two surfaces;
placing a layer of viscoelastic glue onto one surface of said layer of first material;
placing a layer of an electrically conductive second material, which is 1/100th to 1/2 the thickness of the first material over said viscoelastic glue;
pressing said layer of second material against said layer of viscoelastic glue and said first material for a selected time;
drying said layer of second material, said layer of first material and said viscoelastic glue; and attaching an electrically-conductive tape to the edge of a portion of the electrically conductive second material such that a portion of the tape extends beyond the edge.
38. The method of claim 37 wherein said first material comprises a gypsum layer, and said second material comprises a metal layer.
39. The method of claim 37 wherein said first material comprises wood, and said second material comprises metal.
40. The method of forming a laminated structure having at least one edge used for constructing RF attenuating walls, floors, or ceilings which comprises:
providing a layer of an electrically conductive first material having two surfaces;
placing a layer of viscoelastic glue onto one surface of said layer of first material;
placing a layer of a second material over said viscoelastic glue;
pressing said layer of second material against said layer of viscoelastic glue and said first material for a selected time;
drying said layer of second material, said layer of first material and said viscoelastic glue; and attaching an electrically-conductive tape to an edge of said electrically conductive first material such that a portion of said tape extends beyond said edge.
providing a layer of an electrically conductive first material having two surfaces;
placing a layer of viscoelastic glue onto one surface of said layer of first material;
placing a layer of a second material over said viscoelastic glue;
pressing said layer of second material against said layer of viscoelastic glue and said first material for a selected time;
drying said layer of second material, said layer of first material and said viscoelastic glue; and attaching an electrically-conductive tape to an edge of said electrically conductive first material such that a portion of said tape extends beyond said edge.
41. The method of claim 40 wherein the two exterior layers are symmetric, made of the exact same type of material, and having the exact same density and thickness.
42. The method of claim 40 wherein the two exterior layers are non-symmetric, made of other than the exact same type of material, and having other than the exact same density and thickness.
43. The method of claim 40 wherein the two or more interior layers are symmetric, made of the same type of material, and having the same density and thickness.
44. The method of claim 40 wherein the two or more interior layers are non-symmetric, made of other than the exact same type of material, and having other than the same density and thickness.
45. A laminated structure used for constructing RF
attenuating walls, floors, or ceilings which comprises:
a layer of first electrically conductive material having two surfaces;
a layer of viscoelastic glue on one surface of said layer of first material;
a layer of a second material over said viscoelastic glue; and an electrically conductive tape attached to said electrically conductive material such that a portion of said electrically conductive tape is capable of being contacted on an exposed surface of said structure.
attenuating walls, floors, or ceilings which comprises:
a layer of first electrically conductive material having two surfaces;
a layer of viscoelastic glue on one surface of said layer of first material;
a layer of a second material over said viscoelastic glue; and an electrically conductive tape attached to said electrically conductive material such that a portion of said electrically conductive tape is capable of being contacted on an exposed surface of said structure.
46. A panel for use in floors or ceilings so as to attenuate RF transmissions, said panel comprising:
at least one internal electrically conductive layer, wherein said structure has been cut such that an edge of said internal electrically conductive layer is exposed;
a conductive cord placed along said exposed edge of said internal electrically conductive layer; and a conductive tape placed over the edge of said laminated structure exposed by said cutting, thereby to provide electrical contact between an external portion of said structure and said internal electrically conductive layer through said tape and said electrically conductive cord.
at least one internal electrically conductive layer, wherein said structure has been cut such that an edge of said internal electrically conductive layer is exposed;
a conductive cord placed along said exposed edge of said internal electrically conductive layer; and a conductive tape placed over the edge of said laminated structure exposed by said cutting, thereby to provide electrical contact between an external portion of said structure and said internal electrically conductive layer through said tape and said electrically conductive cord.
47. The structures in Claim 46 wherein said electrically conductive cord comprises a cord including a sufficient number of electrically conductive particles such that said cord is electrically conductive from one surface to the other.
48. The structure as in Claim 47 wherein said cord comprises butyl containing a selected number of electrically conductive particles.
49. The structure as in Claim 48 wherein said electrically conductive particles comprise particles coated with a selected metal thereby to be electrically conductive.
50. The structure as in Claim 49 wherein said metal comprises nickel and said nickel particles comprise a sufficient percentage by weight of the electrically conductive cord to provide electrical conduction through the cord.
51. The structure as in Claim 50 wherein said nickel particles comprise approximately 80% by weight of the total weight of said cord.
52. A structure for use in attenuating RF transmissions from one side to the other of the structure comprising:
two or more panels placed side by side such that the edges of each panel abut;
a second layer of panels placed over said first layer of panels such that each panel in the second layer covers the seam between adjacent panels in the first layer;
wherein each panel comprises at least one internal electrically conductive layer; and an electrically conductive tape in electrical contact with said internal electrically conductive layer in each panel and extending out from the edge of the panel and over a selective surface of the panel so as to allow electrical contact to the internal electrically conductive layer to be made from the external surface of the panel.
two or more panels placed side by side such that the edges of each panel abut;
a second layer of panels placed over said first layer of panels such that each panel in the second layer covers the seam between adjacent panels in the first layer;
wherein each panel comprises at least one internal electrically conductive layer; and an electrically conductive tape in electrical contact with said internal electrically conductive layer in each panel and extending out from the edge of the panel and over a selective surface of the panel so as to allow electrical contact to the internal electrically conductive layer to be made from the external surface of the panel.
53. The structure as in Claim 52 wherein said electrically conductive tape extends out from an edge of the panel and is bent back into contact with an external surface of the panel directly adjacent said edge.
54. The structure as in Claim 53 including a second electrically conductive tape placed on the first layer of panels over the edge between abutting panels and in electrical contact with the portion of said electrically conductive tape from each panel which has been exposed on the surface of each panel adjacent said edge.
55. The structure as in Claim 54 wherein each panel in said second layer of panels is in electrical contact with the internal electrically conductive layers in each of the panels in the first layer of panels.
56. The structure as in Claim 55 wherein electrically conductive screws are used to mount each of the panels in the first layer of panels onto support structures, said electrically conductive screws electrically contacting both the electrically conductive tape folded over the external surface of each panel adjacent the edge of each panel and also in electrical contact with the internal electrically conductive layer and further in electrical contact with a selected electrical potential.
57. The structure as in Claim 56 including electrically conductive screws extending through each panel in the second layer of panels so as to make electrical contact with the internal electrically conductive layer in the second layer of panels and then extending through an underlying panel in the first layer of panels so as to electrically connect the internal electrically conducting layer in the panel in the second layer to the internal electrically conducting layer in the underlying panel.
58. The structure as in Claim 56 wherein the selected electrical potential is ground.
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Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7063767B1 (en) * | 2002-02-08 | 2006-06-20 | Proteus Technical Solutions, Inc. | Process for creating a durable EMI/RFI shield between two or more structural surfaces and shield formed therefrom |
US7181891B2 (en) * | 2003-09-08 | 2007-02-27 | Quiet Solution, Inc. | Acoustical sound proofing material and methods for manufacturing same |
US8495851B2 (en) * | 2004-09-10 | 2013-07-30 | Serious Energy, Inc. | Acoustical sound proofing material and methods for manufacturing same |
US7921965B1 (en) | 2004-10-27 | 2011-04-12 | Serious Materials, Inc. | Soundproof assembly and methods for manufacturing same |
US7798287B1 (en) | 2005-01-20 | 2010-09-21 | Serious Materials, Inc. | Acoustical ceiling panels |
US8029881B2 (en) | 2005-11-04 | 2011-10-04 | Serious Energy, Inc. | Radio frequency wave reducing material and methods for manufacturing same |
US20080086957A1 (en) * | 2006-10-04 | 2008-04-17 | Averill Ronald C | Noise-attenuating laminate composite wallboard panel and methods for manufacturing same |
US20080171179A1 (en) * | 2007-01-11 | 2008-07-17 | Quiet Solution, Llc | Low embodied energy wallboards and methods of making same |
US7987645B2 (en) * | 2007-03-29 | 2011-08-02 | Serious Materials, Inc. | Noise isolating underlayment |
US9388568B2 (en) | 2007-04-06 | 2016-07-12 | Pacific Coast Building Products, Inc. | Acoustical sound proofing material with improved fracture characteristics and methods for manufacturing same |
US8424251B2 (en) * | 2007-04-12 | 2013-04-23 | Serious Energy, Inc. | Sound Proofing material with improved damping and structural integrity |
US7883763B2 (en) * | 2007-04-12 | 2011-02-08 | Serious Materials, Inc. | Acoustical sound proofing material with controlled water-vapor permeability and methods for manufacturing same |
US8397864B2 (en) | 2007-04-24 | 2013-03-19 | Serious Energy, Inc. | Acoustical sound proofing material with improved fire resistance and methods for manufacturing same |
US8181738B2 (en) * | 2007-04-24 | 2012-05-22 | Serious Energy, Inc. | Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same |
US10174499B1 (en) | 2007-05-01 | 2019-01-08 | Pacific Coast Building Products, Inc. | Acoustical sound proofing material for architectural retrofit applications and methods for manufacturing same |
US20080286609A1 (en) * | 2007-05-15 | 2008-11-20 | Surace Kevin J | Low embodied energy wallboards and methods of making same |
US20100101457A1 (en) * | 2007-05-25 | 2010-04-29 | Surace Kevin J | Low embodied energy sheathing panels and methods of making same |
US7908818B2 (en) * | 2008-05-08 | 2011-03-22 | Serious Materials, Inc. | Methods of manufacturing acoustical sound proofing materials with optimized fracture characteristics |
US20090000245A1 (en) * | 2007-06-28 | 2009-01-01 | Tinianov Brandon D | Methods of manufacturing acoustical sound proofing material |
US9387649B2 (en) * | 2007-06-28 | 2016-07-12 | Pacific Coast Building Products, Inc. | Methods of manufacturing acoustical sound proofing materials with optimized fracture characteristics |
US7914914B2 (en) * | 2007-06-30 | 2011-03-29 | Serious Materials, Inc. | Low embodied energy sheathing panels with optimal water vapor permeance and methods of making same |
US7799410B2 (en) * | 2007-06-30 | 2010-09-21 | Serious Materials, Inc. | Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same |
US8337993B2 (en) | 2007-11-16 | 2012-12-25 | Serious Energy, Inc. | Low embodied energy wallboards and methods of making same |
US8590272B2 (en) | 2010-06-07 | 2013-11-26 | Georgia-Pacific Gypsum Llc | Acoustical sound proofing materials and methods of making the same |
JP6030494B2 (en) * | 2013-04-19 | 2016-11-24 | 大成建設株式会社 | Electromagnetic shielding film mounting tool for electromagnetic shielding window, electromagnetic shielding window using the same, and construction method of electromagnetic shielding window |
CA2975883C (en) | 2015-02-05 | 2023-09-26 | National Gypsum Properties, Llc | Sound damping wallboard and method of forming a sound damping wallboard |
AR102144A1 (en) * | 2015-10-01 | 2017-02-08 | Consejo Nac De Investig Científicas Y Técnicas (Conicet) | REINFORCED AND ISOLATED RESIN PANEL FOR PROTECTION OF STRUCTURES AGAINST EXPLOSIONS |
CA2988547C (en) | 2016-12-15 | 2021-01-26 | Certainteed Gypsum, Inc. | Plaster boards and methods for making them |
CA3077209C (en) | 2017-09-26 | 2023-02-14 | Certainteed Gypsum, Inc. | Plaster boards having internal layers and methods for making them |
CN111433421B (en) | 2017-09-28 | 2022-02-15 | 瑟登帝石膏公司 | Plasterboard and preparation method thereof |
EP3688245B1 (en) | 2017-09-30 | 2023-03-22 | Certainteed Gypsum, Inc. | Tapered plasterboards and methods for making them |
US10674645B2 (en) * | 2018-07-20 | 2020-06-02 | Event Secure, Inc. | Modular EMF/RF shielded enclosures |
US11056870B2 (en) | 2018-09-20 | 2021-07-06 | United States Gypsum Company | Magnetic decorative trim with DC power transmission |
US11559968B2 (en) | 2018-12-06 | 2023-01-24 | Gold Bond Building Products, Llc | Sound damping gypsum board and method of constructing a sound damping gypsum board |
CA3090925C (en) * | 2019-08-23 | 2023-04-04 | Cpg International Llc | Sound damping railing |
CA3121091A1 (en) | 2020-06-05 | 2021-12-05 | Gold Bond Building Products, Llc | Sound damping gypsum board and method of constructing a sound damping gypsum board |
Family Cites Families (131)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3092250A (en) | 1963-06-04 | Pressure sensitive adhesive tape in which the adhesive | ||
US2811906A (en) | 1955-02-21 | 1957-11-05 | Clifford P Chappell | Method of forming a floor or surface covering |
US3160549A (en) | 1960-12-29 | 1964-12-08 | Minnesota Mining & Mfg | Vibration damping structures |
US3215225A (en) | 1961-11-29 | 1965-11-02 | Korfund Dynamics Corp | Laminated acoustic panels with outer metal layers, fibrous core and viscoelastic damping layer |
US3399104A (en) | 1964-07-28 | 1968-08-27 | Monsanto Res Corp | Vibration damping composition and laminated construction |
US3424270A (en) | 1965-05-12 | 1969-01-28 | Us Plywood Champ Papers Inc | Viscoelastic sound-blocking material with filler of high density particles |
US3336710A (en) | 1965-09-24 | 1967-08-22 | Rohr Corp | Fire resistant wall panel |
US3462899A (en) | 1968-02-26 | 1969-08-26 | Philip E Sherman | Wooden dual panel sound insulating structures |
US3642511A (en) | 1968-10-10 | 1972-02-15 | Morris I Cohn | Method of treating wollastonite with acid and the pigment product formed thereby |
US3579941A (en) | 1968-11-19 | 1971-05-25 | Howard C Tibbals | Wood parquet block flooring unit |
US3828504A (en) | 1971-05-25 | 1974-08-13 | K Spang | Concrete structural member with high internal damping |
US4003752A (en) | 1974-05-22 | 1977-01-18 | Asahi Kasei Kogyo Kabushiki Kaisha | Magnesia cement composition, process of its manufacture, and composite comprising same |
US4112176A (en) | 1974-07-08 | 1978-09-05 | U.S. Rubber Reclaiming Co., Inc. | Ground rubber elastomeric composite useful in surfacings and the like, and methods |
CA1085880A (en) | 1977-10-13 | 1980-09-16 | Samuel Cukier | Foaming agents for gypsum board manufacture |
US4259220A (en) | 1978-12-06 | 1981-03-31 | H. B. Fuller Company | Hot melt adhesive for elastic banding |
US4719261A (en) | 1978-09-22 | 1988-01-12 | H. B. Fuller Company | Hot melt adhesive for elastic banding and method for utlizing the same |
DE2947607C2 (en) | 1979-11-26 | 1985-01-24 | Fa. Carl Freudenberg, 6940 Weinheim | Airborne sound-absorbing cladding for a wall or ceiling |
JPS5687912A (en) | 1979-12-20 | 1981-07-17 | Toshiba Corp | Elastic surface wave filter |
US4412255A (en) | 1981-02-23 | 1983-10-25 | Optical Coating Laboratory, Inc. | Transparent electromagnetic shield and method of manufacturing |
US4375516A (en) | 1982-03-02 | 1983-03-01 | Armstrong World Industries, Inc. | Rigid, water-resistant phosphate ceramic materials and process for preparing them |
US4474840A (en) * | 1981-08-27 | 1984-10-02 | The Gates Corporation | Method of selective bonding of textile materials |
US4759164A (en) | 1982-06-10 | 1988-07-26 | Abendroth Carl W | Flooring system |
US4487793A (en) | 1982-12-27 | 1984-12-11 | Armstrong World Industries, Inc. | Vinyl covered sound absorbing structure |
JPS60102310U (en) | 1983-12-16 | 1985-07-12 | 株式会社ブリヂストン | Vibration damping and sound insulation board |
US5644880A (en) | 1984-02-27 | 1997-07-08 | Georgia-Pacific Corporation | Gypsum board and systems containing same |
US4941207A (en) | 1984-05-01 | 1990-07-10 | Nihon Musen Kabushiki Kaisha | Structure for wireless communication in an electromagnetically shielded building |
CA1234472A (en) | 1984-12-04 | 1988-03-29 | Francis J. Mortimer | Suspended ceiling tile refurbishing system |
JPH0416253Y2 (en) | 1985-01-30 | 1992-04-13 | ||
US4618370A (en) | 1985-09-03 | 1986-10-21 | Millmaster Onyx Group, Inc. | Foam generating compositions |
US4678515A (en) | 1985-09-03 | 1987-07-07 | Stepan Company | Foam generating compositions |
US4685259A (en) | 1986-02-14 | 1987-08-11 | Peabody Noise Control, Inc. | Sound rated floor system and method of constructing same |
US4778028A (en) | 1986-11-03 | 1988-10-18 | General Electric Company | Light viscoelastic damping structure |
US4786543A (en) | 1987-10-06 | 1988-11-22 | Don Ferm | Ceiling tile of expanded polystyrene laminated with embossed vinyl sheet |
US4806703A (en) | 1988-01-11 | 1989-02-21 | The Curran Company | Panel system for EMI shielded enclosures |
JPH0673935B2 (en) * | 1988-04-01 | 1994-09-21 | ニチアス株式会社 | Damping material and soundproof structure using damping material |
US5240639A (en) | 1988-04-07 | 1993-08-31 | Stepan Company | Foaming agent |
US4956321A (en) | 1988-06-16 | 1990-09-11 | Armstrong World Industries, Inc. | Surface pacified wollastonite |
US5026593A (en) | 1988-08-25 | 1991-06-25 | Elk River Enterprises, Inc. | Reinforced laminated beam |
NZ230553A (en) * | 1988-09-21 | 1993-04-28 | Stockham Valve Au Pty Ltd | Check valve with pivoting plates made from sheet material and pivot pin retained in body with spring clips |
CA1290699C (en) | 1988-11-09 | 1991-10-15 | Ghislain L'heureux | Acoustical door |
US5342465A (en) | 1988-12-09 | 1994-08-30 | Trw Inc. | Viscoelastic damping structures and related manufacturing method |
DE3901897A1 (en) | 1989-01-23 | 1990-07-26 | Wolf Woco & Co Franz J | RUBBER SPRING ELEMENT |
US4965408A (en) * | 1989-02-01 | 1990-10-23 | Borden, Inc. | Composite sheet material for electromagnetic radiation shielding |
US4967530A (en) | 1989-03-15 | 1990-11-06 | Clunn Gordon E | Clean room ceiling construction |
US5033247A (en) | 1989-03-15 | 1991-07-23 | Clunn Gordon E | Clean room ceiling construction |
US5143790A (en) | 1989-08-09 | 1992-09-01 | Westinghouse Electric Corp. | Integrally-damped steel composite laminated structure and method of attaching same |
US5155959A (en) | 1989-10-12 | 1992-10-20 | Georgia-Pacific Corporation | Firedoor constructions including gypsum building product |
US5016413A (en) | 1990-02-14 | 1991-05-21 | James Counihan | Resilient floor system |
US5125475A (en) | 1990-08-09 | 1992-06-30 | Les Materiaux Cascades Inc. | Acoustic construction panel |
US5258585A (en) | 1991-02-20 | 1993-11-02 | Indian Head Industries, Inc. | Insulating laminate |
US5496966A (en) | 1991-06-12 | 1996-03-05 | Bellsouth Corporation | Method for controlling indoor electromagnetic signal propagation |
US5595801A (en) * | 1991-07-30 | 1997-01-21 | International Paper Company | Laminated shielding material and method for shielding an enclosure therewith |
US5334806A (en) | 1991-10-18 | 1994-08-02 | Transco Inc. | Temperature and sound insulated panel assembly |
US5158612A (en) | 1991-10-25 | 1992-10-27 | Henkel Corporation | Foaming agent composition and process |
US5585178A (en) | 1991-12-31 | 1996-12-17 | Minnesota Mining & Manufacturing Company | Composite adhesive tape |
US5256223A (en) | 1991-12-31 | 1993-10-26 | The Center For Innovative Technology | Fiber enhancement of viscoelastic damping polymers |
US5439735A (en) | 1992-02-04 | 1995-08-08 | Jamison; Danny G. | Method for using scrap rubber; scrap synthetic and textile material to create particle board products with desirable thermal and acoustical insulation values |
ES2108113T3 (en) | 1992-04-08 | 1997-12-16 | Ecomax Acoustics Ltd | CONSTRUCTION ELEMENT AND ITS MANUFACTURING PROCEDURE. |
US5824973A (en) | 1992-09-29 | 1998-10-20 | Johns Manville International, Inc. | Method of making sound absorbing laminates and laminates having maximized sound absorbing characteristics |
CN2134439Y (en) | 1992-11-25 | 1993-05-26 | 姜国炜 | Colour thermal insulating, sound insulating decoration compound steel plate |
US5473122A (en) | 1993-01-04 | 1995-12-05 | Martin Marietta Corporation | Dual-constrained viscoelastic damping mechanism for structural vibration control |
US5368914A (en) | 1993-03-03 | 1994-11-29 | The United States Of America As Represented By The Secretary Of The Navy | Vibration-damping structural component |
US5768841A (en) | 1993-04-14 | 1998-06-23 | Swartz & Kulpa, Structural Design And Engineering | Wallboard structure |
US6077613A (en) | 1993-11-12 | 2000-06-20 | The Noble Company | Sound insulating membrane |
US5629503A (en) | 1994-02-08 | 1997-05-13 | Tekna Sonic, Inc. | Vibration damping device |
JPH0835538A (en) | 1994-07-25 | 1996-02-06 | Lintec Corp | Vibration damping and reinforcing sheet |
US5474840A (en) | 1994-07-29 | 1995-12-12 | Minnesota Mining And Manufacturing Company | Silica-containing vibration damper and method |
US5827609A (en) | 1995-06-07 | 1998-10-27 | Avery Dennison Corporation | Multilayer Pressure-sensitive adhesive construction |
SG73527A1 (en) | 1995-01-13 | 2000-06-20 | Minnesota Mining & Mfg | Damped laminates with improved fastener force retention a method of making and novel tools useful in making |
DE19509972C2 (en) | 1995-03-18 | 1998-04-09 | Krauss Maffei Verkehrstechnik | Sandwich plate |
US5603192A (en) | 1995-04-03 | 1997-02-18 | Advanced Equipment Corporation | Operable wall panel mounting apparatus |
SE9501754D0 (en) | 1995-04-26 | 1995-05-11 | Mirsch Audioform Ab | Apparatus for providing sound attenuating absorbent effect of structures and method for providing apparatus |
US5945643A (en) | 1995-06-16 | 1999-08-31 | Casser; Donald J. | Vibration dampening material and process |
US5743728A (en) | 1995-08-15 | 1998-04-28 | Usg Corporation | Method and system for multi-stage calcining of gypsum to produce an anhydrite product |
US5643666A (en) | 1995-12-20 | 1997-07-01 | Eastman Chemical Company | Solid surfaces which are prepared from copolyesters laminated onto a high resolution image |
US5867957A (en) | 1996-10-17 | 1999-02-09 | Solutia, Inc. | Sound insulation pad and use thereof |
US6213252B1 (en) | 1996-11-08 | 2001-04-10 | Royal Mat International Inc. | Sound absorbing substrate |
DE19653930A1 (en) | 1996-12-21 | 1998-06-25 | Wilhelmi Werke Ag | Sound absorbing building board |
US6342284B1 (en) | 1997-08-21 | 2002-01-29 | United States Gysum Company | Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it |
US6632550B1 (en) | 1997-08-21 | 2003-10-14 | United States Gypsum Company | Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it |
US6103640A (en) * | 1997-09-12 | 2000-08-15 | Bridgestone Corporation | Electromagnetic-wave shielding and light transmitting plate |
RU2184818C2 (en) | 1997-10-09 | 2002-07-10 | ЗИКА АГ, форм. КАСПАР ВИНКЛЕР & КО. | Method for manufacture of three-layered plate, plate manufactured by this method and sound-proofing structure |
CA2309983A1 (en) | 1997-11-12 | 1999-05-20 | Robert S. Boyd | Vibration dampening laminate |
US6309985B1 (en) | 1998-01-26 | 2001-10-30 | Soundwich, Inc. | Formable constraining layer system |
US6266427B1 (en) | 1998-06-19 | 2001-07-24 | Mcdonnell Douglas Corporation | Damped structural panel and method of making same |
US6285525B1 (en) | 1998-07-01 | 2001-09-04 | 3M Innovative Properties Company | Damped spacer articles and disk drive assemblies containing damped spacer articles |
US6240704B1 (en) | 1998-10-20 | 2001-06-05 | William H. Porter | Building panels with plastic impregnated paper |
US6123171A (en) | 1999-02-24 | 2000-09-26 | Mcnett; Christopher P. | Acoustic panels having plural damping layers |
US6699426B1 (en) | 1999-06-15 | 2004-03-02 | National Gypsum Properties, Llc. | Gypsum wallboard core, and method and apparatus for making the same |
US6536555B1 (en) | 1999-10-12 | 2003-03-25 | Seagate Technology Llc | Multilayer acoustic damper for a disc drive |
US7041377B2 (en) | 2000-04-14 | 2006-05-09 | Sekisui Chemical Co., Ltd. | Resin composition for vibration-damping material, vibration-damping material, and sound-insulating member |
SE521524C2 (en) | 2000-05-09 | 2003-11-11 | Ecophon Ab | Ceiling tile has protruding ridge that is formed by inserting least one of a metal or plastic element in transverse edge surface of fiber material |
US6286280B1 (en) | 2000-05-11 | 2001-09-11 | Tyco Plastic Services Ag | Flame retardant composite sheathing |
US6877585B2 (en) | 2000-05-12 | 2005-04-12 | Johns Manville International, Inc. | Acoustical ceiling tiles |
JP4061014B2 (en) | 2000-09-28 | 2008-03-12 | 大日本印刷株式会社 | Cosmetic material |
PL365806A1 (en) | 2000-10-04 | 2005-01-10 | James Hardie Research Pty Limited | Fiber cement composite materials using cellulose fibers loaded with inorganic and/or organic substances |
PL361095A1 (en) | 2000-10-10 | 2004-09-20 | James Hardie Research Pty Limited | Composite building material |
US6381196B1 (en) | 2000-10-26 | 2002-04-30 | The United States Of America As Represented By The Secretary Of The Navy | Sintered viscoelastic particle vibration damping treatment |
US6443256B1 (en) | 2000-12-27 | 2002-09-03 | Usg Interiors, Inc. | Dual layer acoustical ceiling tile having an improved sound absorption value |
US6758305B2 (en) | 2001-01-16 | 2004-07-06 | Johns Manville International, Inc. | Combination sound-deadening board |
US6803110B2 (en) | 2001-01-22 | 2004-10-12 | Formica Corporation | Decorative laminate assembly and method for producing same |
JP3566939B2 (en) | 2001-03-28 | 2004-09-15 | 住友ゴム工業株式会社 | Unit pattern arrangement method for pneumatic tires |
MY140920A (en) | 2001-04-02 | 2010-02-12 | Darren Aster Gunasekara | An acoustic tile |
US7214282B2 (en) * | 2001-05-16 | 2007-05-08 | Bridgeston Corporation | Electromagnetic-wave shielding and light transmitting plate, manufacturing method thereof and display panel |
US20030006090A1 (en) | 2001-06-27 | 2003-01-09 | Reed John Douglas | Broadband noise-suppressing barrier |
US6920723B2 (en) | 2001-08-16 | 2005-07-26 | Dodge-Regupol, Incorporated | Impact sound insulation |
JP2003071834A (en) | 2001-09-05 | 2003-03-12 | Toray Ind Inc | Crystallization treatment method for polyester resin |
US6715241B2 (en) | 2001-10-16 | 2004-04-06 | Johns Manville International, Inc. | Lightweight sound-deadening board |
AU2002363567A1 (en) * | 2001-10-17 | 2003-05-19 | Laird Technologies, Inc. | Method and apparatus for emi shielding |
US6822033B2 (en) | 2001-11-19 | 2004-11-23 | United States Gypsum Company | Compositions and methods for treating set gypsum |
RU2305164C2 (en) | 2001-11-28 | 2007-08-27 | МЕЙЕР Ханс | Floor plate laying system |
US6815049B2 (en) | 2001-12-11 | 2004-11-09 | United States Gypsum Company | Gypsum-containing composition having enhanced resistance to permanent deformation |
US6825137B2 (en) | 2001-12-19 | 2004-11-30 | Telair International Incorporated | Lightweight ballistic resistant rigid structural panel |
US7063767B1 (en) * | 2002-02-08 | 2006-06-20 | Proteus Technical Solutions, Inc. | Process for creating a durable EMI/RFI shield between two or more structural surfaces and shield formed therefrom |
FR2837508B1 (en) | 2002-03-19 | 2005-06-24 | Ecole Polytech | ANTI-NOISE WALL |
US20040016184A1 (en) | 2002-07-26 | 2004-01-29 | Huebsch Robert J. | Acoustical ceiling tile |
US6913667B2 (en) | 2003-03-14 | 2005-07-05 | Thomas Nudo | Composite structural panel and method |
US20040214008A1 (en) | 2003-04-25 | 2004-10-28 | Dobrusky Scott R. | Flexible magnetic damping laminate with thermosetting adhesive layer |
US7068033B2 (en) | 2003-08-18 | 2006-06-27 | Ge Medical Systems Global Technology Company, Llc | Acoustically damped gradient coil |
US7181891B2 (en) | 2003-09-08 | 2007-02-27 | Quiet Solution, Inc. | Acoustical sound proofing material and methods for manufacturing same |
CN1863828A (en) | 2003-10-08 | 2006-11-15 | 艾利丹尼森公司 | Sound damping adhesive |
CA2516083C (en) | 2004-08-17 | 2013-03-12 | Dirtt Environmental Solutions Ltd. | Integrated reconfigurable wall system |
US7438755B2 (en) | 2004-09-03 | 2008-10-21 | Uchicago Argonne, Llc | Chemically bonded phosphate ceramic sealant formulations for oil field applications |
US8495851B2 (en) * | 2004-09-10 | 2013-07-30 | Serious Energy, Inc. | Acoustical sound proofing material and methods for manufacturing same |
US7909136B2 (en) | 2004-11-24 | 2011-03-22 | Serious Materials, Inc. | Soundproof assembly |
US7012190B1 (en) * | 2004-12-08 | 2006-03-14 | General Dynamics Armament And Technical Products, Inc. | Seam bracket for EMI shielded structure |
US8029881B2 (en) | 2005-11-04 | 2011-10-04 | Serious Energy, Inc. | Radio frequency wave reducing material and methods for manufacturing same |
US7745005B2 (en) | 2007-06-30 | 2010-06-29 | Serious Materials, Inc. | Acoustical sound proofing material |
US8397864B2 (en) | 2007-04-24 | 2013-03-19 | Serious Energy, Inc. | Acoustical sound proofing material with improved fire resistance and methods for manufacturing same |
US20090000245A1 (en) | 2007-06-28 | 2009-01-01 | Tinianov Brandon D | Methods of manufacturing acoustical sound proofing material |
US7799410B2 (en) | 2007-06-30 | 2010-09-21 | Serious Materials, Inc. | Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same |
-
2005
- 2005-11-04 US US11/267,957 patent/US8029881B2/en active Active
-
2006
- 2006-11-03 WO PCT/US2006/043247 patent/WO2007056322A2/en active Application Filing
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- 2006-11-03 RU RU2008122335/09A patent/RU2008122335A/en not_active Application Discontinuation
- 2006-11-03 EP EP10182787A patent/EP2267844A1/en not_active Withdrawn
- 2006-11-03 CA CA2628492A patent/CA2628492C/en active Active
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RU2008122335A (en) | 2009-12-10 |
US20070107350A1 (en) | 2007-05-17 |
EP1952486A4 (en) | 2009-12-02 |
CA2628492C (en) | 2014-08-19 |
WO2007056322A3 (en) | 2008-02-21 |
EP1952486A2 (en) | 2008-08-06 |
WO2007056322A2 (en) | 2007-05-18 |
EP2267844A1 (en) | 2010-12-29 |
EP1952486B1 (en) | 2013-05-01 |
US8029881B2 (en) | 2011-10-04 |
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