US3590202A - Construction for tuning microwave heating applicator - Google Patents

Construction for tuning microwave heating applicator Download PDF

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US3590202A
US3590202A US13321A US3590202DA US3590202A US 3590202 A US3590202 A US 3590202A US 13321 A US13321 A US 13321A US 3590202D A US3590202D A US 3590202DA US 3590202 A US3590202 A US 3590202A
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end cap
sleeve
applicator
cavity
microwave heating
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US13321A
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John D A Day
Edward J Hunt
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Bechtel Corp
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Bechtel Corp
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/705—Feed lines using microwave tuning

Definitions

  • Cl 1105b 9/06 f admitting heated air into the cavity, the size f each 0513/5/00 foration being sufficiently small relative to its length to attenu- [50] Field of Search 219/1055, ate the transmission f microwave energy, a if ld f 10-61; 333/83 receiving heated air and guiding the air toward the perforations in the end cap; and a cylindrical metal sleeve mounted in [56] Reerences Cited openings through the end cap and manifold, one end of said UNITED STATES PATENTS sleeve projecting into the resonant cavity and the other end 2,640,142 5/1953 Kinn 219/1061 X being accessible for adjusting its axial position as to tune the 3,235,702 2/1966 Timmermans et al. 219/1061 cavity,
  • microwave heating applicators which provide means for continuously processing a threadlike substance and which also have the capacity for being tuned while in operation.
  • An exemplary teaching of this type is described in U.S. Pat. No. 3,461,261 in which tuning is accomplished by partially loading the cavity using a quartz sleeve mounted in one end of the applicator.
  • none of the previously known microwave applicators are capable of being operated in the TM modes and tuned while simultaneously passing an airstream through a resonant cavity.
  • the present invention comprises a microwave heating applicator having a cylindrical resonant cavity which is tuned with a metallic sleeve, the axial position and portion of the sleeve within the resonant cavity determining the effective electrical length of the applicator as a whole as determined by the formula Where effective electrical length of applicator l, physical length of that portion of resonant cavity which is occupied by the metallic sleeve.
  • one object of the present invention is to provide a microwave heating applicator with means for tuning a cylindrical resonant cavity by changing its effective electrical length and while simultaneously processing a threadlike substance through the applicator in a heated airstream.
  • Another object is to provide a microwave heating applicator of the kind described which may be disassembled for cleaning and then reassembled with a minimum of down time and labor.
  • FIG. 2 is a vertical section of a portion of the applicator shown in FIG. 1;
  • FIG. 3 is an enlarged vertical section of the lower end of the applicator
  • FIG. 4 is a section taken on lines 44 of FIG. 3;
  • FIG. 5 is a perspective view of the tuning sleeve mounted in the perforated end cap forming part of the applicator.
  • FIG. 1 there is shown a preferred embodiment in a microwave applicator connected to a source of microwave energy it through a three-port circulator 12.
  • One port of the circulator connects with a water load 13 which absorbs reflected energy, the other two ports connecting the applicator with the source of microwave energy, all in a manner well known in this art.
  • applicator 10 comprises a cylindrical waveguide 20 that operates in the TM modes for heating the material T as it is drawn through the waveguide. Heated air is introduced into the waveguide through a bottom manifold 21 secured by set screw 22 to an axially segmented sleeve 23, said sleeve forming an integral part of a perforated end cap 24 having a plurality of openings 24a for admitting heated air into the resonant cavity.
  • the cross section or size of each opening 24a is restricted by design so that microwave energy is not lost through the openings.
  • End cap 24 provides a cylindrical wall section 25 that defines a portion of the resonant cavity, a relatively large flange 26 being provided at the end of the wall section for attaching the end cap to the bottom flange 27 of wave guide 20.
  • the two flanges are joined together by a rapid disconnect coupling 28 of conventional design.
  • the end cap is designed as a component part of the applicator so that the interface between flanges 26 and 27 is a quarter wavelength from the end of the resonant cavity. This construction creates a condition such that the E field between flanges is at a minimum. Also, the relatively large and flat surfaces of contact between flanges makes the joint relatively insensitive to frequency variations.
  • End cap 24 further comprises an inner segmented sleeve 29 that extends into the resonant cavity a distance of approximately one quarter wavelength, and the ends of the sleeve are preferably tapered to avoid arcing.
  • the tapered ends also aid in preventing dust or other materials introduced into the waveguide from collecting in a region of high E field intensity.
  • Inner segmented sleeve 29, as well as exterior sleeve 23, define an inner opening and mounting for a metallic tuning sleeve 30.
  • the segments of sleeve 29 are particularly formed so that their tapered ends contact the tuning sleeve with a resilient gripping force. This force is sufficient to support the sleeve itself but allows the sleeve to be moved coaxially of the resonant cavity into various positions of adjustment.
  • sleeve 30 is clamped in a fixed axial position by means of an expansible band 31 mounted around a segmented portion of sleeve 23.
  • Applicator 10 further comprises an upper end cap 40 having a lateral connection 41 that communicates with a vacuum source, not shown.
  • a choke device 42 having a pair of quarter wave recesses 43 and 44 spaced approximately one-half wavelength apart is employed to attenuate microwaves and prevent energy losses through the upper end of the waveguide.
  • applicator 10 provides a cylindrical resonant cavity that operates in essentially the TM modes for drying a threadlike material.
  • the moisture and other gases which is expelled from the threadlike material is removed by a stream of heated air.
  • This air is introduced through bottom manifold 21, passed into the resonant through openings 24a of end cap 24 and then removed from the cavity through the upper end cap 40.
  • the resonant cavity of applicator 10 may be tuned during normal processing of the threadlike material by simply adjusting the axial position of tuning sleeve 30.
  • a perforated end cap mounted to one end of said applicator, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough, means defining a central opening through said end cap and coaxial relative to said cavity; means defining a plenum at the one end of said applicator for receiving heated air and guiding the air through the perforations in said end cap, said plenum means having an opening coaxial with the opening of said end cap; and a cylindrical tuning sleeve mounted in the openings through said end cap and plenum means, one end of said cylindrical sleeve extending into said cavity, the other end of said sleeve projecting out from said plenum means.
  • the microwave heating applicator of claim 1 the opening through said end cap being defined by a substantially cylindrical mounting sleeve having a segmented end that extends into said cavity and terminates at a distance approximately onefourth wavelength from the near end of the cavity.
  • said end cap comprising a cylindrical wall section that defines a portion of the resonant cavity and having a connecting flange for attachment to the applicator, the axial length of said wall portion being approximately one-fourth wavelength.
  • a microwave heating applicator having a resonant cavity adapted to operate in the TM modes and comprising: a cylindrical waveguide; an end cap mounted at one end of said waveguide, said end cap being perforated and having a central opening coaxial of said waveguide the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough; a plenum in communication with said perforations and having an opening therethrough and a cylindrical metal tuning sleeve extending through the opening of said end cap and axially adjustable therein, one end of said sleeve projecting into the resonant cavity and the other end being accessible to adjust the axial position of the sleeve and tune the cavity.
  • said end cap comprising a substantially cylindrical mounting sleeve for supporting said metal tuning sleeve, and further comprising a mainfold mounted to said end cap for receiving heated air and guiding the air through the perforated end cap into the resonant cavity, said manifold havingan opening therethrough coaxial with the mounting sleeve and the central opening of said end cap, said mounting sleeve extending through the opening of said manifold.

Abstract

A microwave heating applicator that operates in the TM modes having a substantially cylindrical resonant cavity in which elongate material is heated while being processed therethrough. A microwave heating applicator having a perforated end cap on one end, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to attenuate the transmission of microwave energy, a manifold for receiving heated air and guiding the air toward the perforations in the end cap; and a cylindrical metal sleeve mounted in openings through the end cap and manifold, one end of said sleeve projecting into the resonant cavity and the other end being accessible for adjusting its axial position as to tune the cavity.

Description

United States Patent 7 I l 13,590,202
[72] Inventors John D. A. Day 3,449,836 6/1969 Schreiber et a1 219/1055 X Berkeley; 3.457.385 7/1969 Cumming 219/1055 Edward J. Hunt. San Francisco. both of. 3.461.261 8/1969 Lewis et a1 219/1055 Calif. 3.465.114 9/1969 Bleachly 219/1055 [2H P 1332 Primary Examiner-.l. V. Truhe [22] Filed Feb. 24, 1970 5] Patented J 29 1971 Asslstan! E.\'ammerL. H. Bender [73] Assignee Bechtel Corporation AIwmey EckhOffand Hoppe [54] CONSTRUCTION FOR TUNING MICROWAVE HEATING APPLICATOR ABSTRACT: A microwave heat ng applicator that operates in the TM modes having a substantially cylindrical resonant cavi- 6 Claims, 5 Drawing Figs.
ty 111 which elongate material 18 heated while being processed [S2] U.S.C1 219/1055, therethmugh A microwave heating applicator h i a 219/10-61 forated end cap on one end, said end cap having perforations [51] Int. Cl 1105b 9/06 f admitting heated air into the cavity, the size f each 0513/5/00 foration being sufficiently small relative to its length to attenu- [50] Field of Search 219/1055, ate the transmission f microwave energy, a if ld f 10-61; 333/83 receiving heated air and guiding the air toward the perforations in the end cap; and a cylindrical metal sleeve mounted in [56] Reerences Cited openings through the end cap and manifold, one end of said UNITED STATES PATENTS sleeve projecting into the resonant cavity and the other end 2,640,142 5/1953 Kinn 219/1061 X being accessible for adjusting its axial position as to tune the 3,235,702 2/1966 Timmermans et al. 219/1061 cavity,
PATENTED JUN29 I97! SHEET 1 OF 2 GENERATOK MICKOWAVE -rIEr JOHN Q' I BZV BY EMA/e0 J. HUNT ATTORNEYS PATENTEDJUNZSIQII $590,202
SHEET 2 OF 2 1/2 J5 .T" 1.:- E1
\V INVENTORS P. I. r- I a I, JOHN D. A. DAY
I! :i 3 BY EDWARD J. HUNT ATTORNEYS CONSTRUCTION FOR TUNING MICROWAVE HEATING APPLICATOR This invention generally relates to microwave heating applicators and more particularly to applicators for continuously processing and heating a threadlike substance. The invention particularly relates to applicators which operate in the TM modes and which may be tuned while in use.
Various microwave heating applicators are known which provide means for continuously processing a threadlike substance and which also have the capacity for being tuned while in operation. An exemplary teaching of this type is described in U.S. Pat. No. 3,461,261 in which tuning is accomplished by partially loading the cavity using a quartz sleeve mounted in one end of the applicator. However, none of the previously known microwave applicators are capable of being operated in the TM modes and tuned while simultaneously passing an airstream through a resonant cavity. In brief, the present invention comprises a microwave heating applicator having a cylindrical resonant cavity which is tuned with a metallic sleeve, the axial position and portion of the sleeve within the resonant cavity determining the effective electrical length of the applicator as a whole as determined by the formula Where effective electrical length of applicator l, physical length of that portion of resonant cavity which is occupied by the metallic sleeve.
1 physical length of the remaining portion of resonant cavity not occupied by the metallic sleeve.
Ag, wavelength in coaxial section of resonant cavity occupied by the metallic sleeve.
Ag wavelength in remaining portion of resonant cavity not occupied by metallic sleeve. In addition, a further feature of the present invention is in providing an applicator construction which allows a stream of heated air to be passed through the resonant cavity while also allowing the cavity to be tuned.
It is to be understood, therefore, that one object of the present invention is to provide a microwave heating applicator with means for tuning a cylindrical resonant cavity by changing its effective electrical length and while simultaneously processing a threadlike substance through the applicator in a heated airstream.
Another object is to provide a microwave heating applicator of the kind described which may be disassembled for cleaning and then reassembled with a minimum of down time and labor.
Other objects of this invention will become apparent in view of the following detailed description and the accompanying drawings.
In the drawings forming a part of this application and in which like parts are identified by like reference numerals throughout the same.
FIG. 1 is a perspective view of a preferred embodiment of this invention in a microwave heating applicator, a portion of the'applicator being broken away;
FIG. 2 is a vertical section of a portion of the applicator shown in FIG. 1;
FIG. 3 is an enlarged vertical section of the lower end of the applicator;
FIG. 4 is a section taken on lines 44 of FIG. 3; and
FIG. 5 is a perspective view of the tuning sleeve mounted in the perforated end cap forming part of the applicator.
Referring to FIG. 1 in particular, there is shown a preferred embodiment in a microwave applicator connected to a source of microwave energy it through a three-port circulator 12. One port of the circulator connects with a water load 13 which absorbs reflected energy, the other two ports connecting the applicator with the source of microwave energy, all in a manner well known in this art.
The present invention is directed more especially to those structural details of applicator 10 which allow tuning while elongated, threadlike material T is being processed. In general, applicator 10 comprises a cylindrical waveguide 20 that operates in the TM modes for heating the material T as it is drawn through the waveguide. Heated air is introduced into the waveguide through a bottom manifold 21 secured by set screw 22 to an axially segmented sleeve 23, said sleeve forming an integral part of a perforated end cap 24 having a plurality of openings 24a for admitting heated air into the resonant cavity. The cross section or size of each opening 24a is restricted by design so that microwave energy is not lost through the openings. This involves a selection and design of opening size and length as required to attenuate microwave energy of predetermined wavelength. In effect, the perforated end cap serves as a conducting screen in which openings 24a are too small to permit radiation leakage but offer only slight restriction to the flow of heated air.
End cap 24 provides a cylindrical wall section 25 that defines a portion of the resonant cavity, a relatively large flange 26 being provided at the end of the wall section for attaching the end cap to the bottom flange 27 of wave guide 20. The two flanges are joined together by a rapid disconnect coupling 28 of conventional design.
It will be especially noted that the end cap is designed as a component part of the applicator so that the interface between flanges 26 and 27 is a quarter wavelength from the end of the resonant cavity. This construction creates a condition such that the E field between flanges is at a minimum. Also, the relatively large and flat surfaces of contact between flanges makes the joint relatively insensitive to frequency variations.
End cap 24 further comprises an inner segmented sleeve 29 that extends into the resonant cavity a distance of approximately one quarter wavelength, and the ends of the sleeve are preferably tapered to avoid arcing. The tapered ends also aid in preventing dust or other materials introduced into the waveguide from collecting in a region of high E field intensity.
Inner segmented sleeve 29, as well as exterior sleeve 23, define an inner opening and mounting for a metallic tuning sleeve 30. The segments of sleeve 29 are particularly formed so that their tapered ends contact the tuning sleeve with a resilient gripping force. This force is sufficient to support the sleeve itself but allows the sleeve to be moved coaxially of the resonant cavity into various positions of adjustment. Once the resonant cavity has been properly tuned, sleeve 30 is clamped in a fixed axial position by means of an expansible band 31 mounted around a segmented portion of sleeve 23.
Applicator 10 further comprises an upper end cap 40 having a lateral connection 41 that communicates with a vacuum source, not shown. In addition, a choke device 42 having a pair of quarter wave recesses 43 and 44 spaced approximately one-half wavelength apart is employed to attenuate microwaves and prevent energy losses through the upper end of the waveguide.
In operation, applicator 10 provides a cylindrical resonant cavity that operates in essentially the TM modes for drying a threadlike material. The moisture and other gases which is expelled from the threadlike material is removed by a stream of heated air. This air is introduced through bottom manifold 21, passed into the resonant through openings 24a of end cap 24 and then removed from the cavity through the upper end cap 40. Unlike conventional microwave heating applicators, the resonant cavity of applicator 10 may be tuned during normal processing of the threadlike material by simply adjusting the axial position of tuning sleeve 30.
Although a preferred embodiment of this invention is illustrated and described, various modifications and changes may be made in the applicator construction without departing from the spirit of the invention or the scope of the attached claims, and each of such modifications and changes is contemplated.
What we claim is:
1. In a microwave heating applicator having a substantially cylindrical resonant 'cavity, a perforated end cap mounted to one end of said applicator, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough, means defining a central opening through said end cap and coaxial relative to said cavity; means defining a plenum at the one end of said applicator for receiving heated air and guiding the air through the perforations in said end cap, said plenum means having an opening coaxial with the opening of said end cap; and a cylindrical tuning sleeve mounted in the openings through said end cap and plenum means, one end of said cylindrical sleeve extending into said cavity, the other end of said sleeve projecting out from said plenum means.
2. The microwave heating applicator of claim 1, the opening through said end cap being defined by a substantially cylindrical mounting sleeve having a segmented end that extends into said cavity and terminates at a distance approximately onefourth wavelength from the near end of the cavity.
3. The microwave heating applicator of claim 2, said segmented end comprising a plurality of fingers that taper axially inward and provide resiliency for griping said tuning sleeve. 7
4. The microwave heating applicator of claim 1, said end cap comprising a cylindrical wall section that defines a portion of the resonant cavity and having a connecting flange for attachment to the applicator, the axial length of said wall portion being approximately one-fourth wavelength.
5. A microwave heating applicator having a resonant cavity adapted to operate in the TM modes and comprising: a cylindrical waveguide; an end cap mounted at one end of said waveguide, said end cap being perforated and having a central opening coaxial of said waveguide the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough; a plenum in communication with said perforations and having an opening therethrough and a cylindrical metal tuning sleeve extending through the opening of said end cap and axially adjustable therein, one end of said sleeve projecting into the resonant cavity and the other end being accessible to adjust the axial position of the sleeve and tune the cavity.
6. The microwave heating applicator of claim 5, said end cap comprising a substantially cylindrical mounting sleeve for supporting said metal tuning sleeve, and further comprising a mainfold mounted to said end cap for receiving heated air and guiding the air through the perforated end cap into the resonant cavity, said manifold havingan opening therethrough coaxial with the mounting sleeve and the central opening of said end cap, said mounting sleeve extending through the opening of said manifold.

Claims (6)

1. In a microwave heating applicator having a substantially cylindrical resonant cavity, a perforated end cap mounted to one end of said applicator, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough, means defining a central opening through said end cap and coaxial relative to said cavity; means defining a plenum at the one end of said applicator for receiving heated air and guiding the air through the perforations in said end cap, said plenum means having an opening coaxial with the opening of said end cap; and a cylindrical tuning sleeve mounted in the openings through said end cap and plenum means, one end of said cylindrical sleeve extending into said cavity, the other end of said sleeve projecting out from said plenum means.
2. The microwave heating applicator of claim 1, the opening through said end cap being defined by a substantially cylindrical mounting sleeve having a segmented end that extends into said cavity and terminates at a distance approximately one-fourth wavelength from the near end of the cavity.
3. The microwave heating applicator of claim 2, said segmented end comprising a plurality of fingers that taper axially inward and provide resiliency for griping said tuning sleeve.
4. The microwave heating applicator of claim 1, said end cap comprising a cylindrical wall section that defines a portion of the resonant cavity and having a connecting flange for attachment to the applicator, the axial length of said wall portion being approximately one-fourth wavelength.
5. A microwave heating applicator having a resonant cavity adapted to operate in the TM modes and comprising: a cylindrical waveguide; an end cap mounted at one end of said waveguide, said end cap being perforated and having a central opening coaxial of said waveguide the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough; a plenum in communication with said perforations and having an opening therethrough and a cylindrical metal tuning sleeve extending through the opening of said end cap and axially adjustable therein, one end of said sleeve projecting into the resonant cavity and the other end being accessible to adjust the axial position of the sleeve and tune the cavity.
6. The microwave heating applicator of claim 5, said end cap comprising a substantially cylindrical mounting sleeve for supporting said metal tuning sleeve, and further comprising a mainfold mounted To said end cap for receiving heated air and guiding the air through the perforated end cap into the resonant cavity, said manifold having an opening therethrough coaxial with the mounting sleeve and the central opening of said end cap, said mounting sleeve extending through the opening of said manifold.
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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715555A (en) * 1972-04-19 1973-02-06 R Johnson Circular waveguide microwave applicator
US3731038A (en) * 1971-02-22 1973-05-01 Patents And Dev Ltd Zero-mode microwave applicator
US3761665A (en) * 1972-05-25 1973-09-25 Tokyo Shibaura Electric Co Microwave heating apparatus with looped wave guide and phase shifting means
US3863653A (en) * 1971-11-05 1975-02-04 Oreal Method for treating fibers by subjecting them to high frequency electric fields
FR2318555A1 (en) * 1975-07-16 1977-02-11 Lignes Telegraph Telephon IMPROVEMENTS IN HYPERFREQUENCY OVENS USED IN PARTICULAR FOR HEATING GLASS RODS AND OPTICAL FIBERS
US4045639A (en) * 1973-01-16 1977-08-30 Food Processing Systems Corporation Continuous microwave and vacuum dryer
US4090055A (en) * 1977-02-10 1978-05-16 Northern Telecom Limited Apparatus for manufacturing an optical fibre with plasma activated deposition in a tube
US4125389A (en) * 1977-02-10 1978-11-14 Northern Telecom Limited Method for manufacturing an optical fibre with plasma activated deposition in a tube
US4144434A (en) * 1976-06-14 1979-03-13 Societe Lignes Telegraphiques Et Telephoniques Microwave heating devices
FR2415410A1 (en) * 1978-01-02 1979-08-17 Husqvarna Ab MICROWAVE HEATING UNIT
US4714812A (en) * 1985-05-08 1987-12-22 John F. Woodhead, III Apparatus and method for processing dielectric materials with microwave energy
US4780585A (en) * 1985-06-28 1988-10-25 Societe Nationale Elf Aquitaine Method and device for the thermal treatment of a conductor element at least partially constituted by a conducting material
US4889965A (en) * 1988-12-15 1989-12-26 Hydro-Quebec Microwave drying of the paper insulation of high voltage electrotechnical equipments
US5191182A (en) * 1990-07-11 1993-03-02 International Business Machines Corporation Tuneable apparatus for microwave processing
US5632921A (en) * 1995-06-05 1997-05-27 The Rubbright Group, Inc. Cylindrical microwave heating applicator with only two modes
WO1999013689A1 (en) * 1997-09-08 1999-03-18 The Rubbright Group, Inc. Tubular microwave applicator
US6320170B1 (en) 1999-09-17 2001-11-20 Cem Corporation Microwave volatiles analyzer with high efficiency cavity
US20020179596A1 (en) * 2001-06-01 2002-12-05 Tracy Michael L. Microwave applicator for heating a moving fluid
US20080233020A1 (en) * 2007-03-15 2008-09-25 Capital Technologies, Inc. Processing apparatus with an electromagnetic launch
WO2009116923A1 (en) * 2008-03-19 2009-09-24 Skåne-Möllan Ab Device and method for microwave treatment of grain
US20120241445A1 (en) * 2009-09-01 2012-09-27 Lg Electronics Inc. Cooking appliance employing microwaves
EP2983455A1 (en) * 2014-08-07 2016-02-10 Industrial Microwave Systems, L.L.C. Tubular choked waveguide applicator
EP3074201A4 (en) * 2013-11-26 2017-08-09 Industrial Microwave Systems LLC Tubular waveguide applicator
US20170226466A1 (en) * 2014-08-05 2017-08-10 Biogreen 360, Inc. Organic Waste Digester System
US11491490B1 (en) 2021-05-27 2022-11-08 Biogreen 360, Inc. Organic waste management system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640142A (en) * 1946-10-04 1953-05-26 Westinghouse Electric Corp Microwave heating
US3235702A (en) * 1962-10-26 1966-02-15 Philips Corp High-frequency oven
US3449836A (en) * 1967-10-25 1969-06-17 Bechtel Int Corp Air suspension system in microwave drying
US3457385A (en) * 1966-07-07 1969-07-22 Canadian Patents Dev Apparatus for dielectric heating
US3461261A (en) * 1966-10-31 1969-08-12 Du Pont Heating apparatus
US3465114A (en) * 1966-09-19 1969-09-02 Canadian Patents Dev Method and apparatus for dielectric heating

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640142A (en) * 1946-10-04 1953-05-26 Westinghouse Electric Corp Microwave heating
US3235702A (en) * 1962-10-26 1966-02-15 Philips Corp High-frequency oven
US3457385A (en) * 1966-07-07 1969-07-22 Canadian Patents Dev Apparatus for dielectric heating
US3465114A (en) * 1966-09-19 1969-09-02 Canadian Patents Dev Method and apparatus for dielectric heating
US3461261A (en) * 1966-10-31 1969-08-12 Du Pont Heating apparatus
US3449836A (en) * 1967-10-25 1969-06-17 Bechtel Int Corp Air suspension system in microwave drying

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731038A (en) * 1971-02-22 1973-05-01 Patents And Dev Ltd Zero-mode microwave applicator
US3863653A (en) * 1971-11-05 1975-02-04 Oreal Method for treating fibers by subjecting them to high frequency electric fields
US3715555A (en) * 1972-04-19 1973-02-06 R Johnson Circular waveguide microwave applicator
US3761665A (en) * 1972-05-25 1973-09-25 Tokyo Shibaura Electric Co Microwave heating apparatus with looped wave guide and phase shifting means
US4045639A (en) * 1973-01-16 1977-08-30 Food Processing Systems Corporation Continuous microwave and vacuum dryer
FR2318555A1 (en) * 1975-07-16 1977-02-11 Lignes Telegraph Telephon IMPROVEMENTS IN HYPERFREQUENCY OVENS USED IN PARTICULAR FOR HEATING GLASS RODS AND OPTICAL FIBERS
US4144434A (en) * 1976-06-14 1979-03-13 Societe Lignes Telegraphiques Et Telephoniques Microwave heating devices
US4090055A (en) * 1977-02-10 1978-05-16 Northern Telecom Limited Apparatus for manufacturing an optical fibre with plasma activated deposition in a tube
US4125389A (en) * 1977-02-10 1978-11-14 Northern Telecom Limited Method for manufacturing an optical fibre with plasma activated deposition in a tube
FR2415410A1 (en) * 1978-01-02 1979-08-17 Husqvarna Ab MICROWAVE HEATING UNIT
US4714812A (en) * 1985-05-08 1987-12-22 John F. Woodhead, III Apparatus and method for processing dielectric materials with microwave energy
US4780585A (en) * 1985-06-28 1988-10-25 Societe Nationale Elf Aquitaine Method and device for the thermal treatment of a conductor element at least partially constituted by a conducting material
US4889965A (en) * 1988-12-15 1989-12-26 Hydro-Quebec Microwave drying of the paper insulation of high voltage electrotechnical equipments
US5191182A (en) * 1990-07-11 1993-03-02 International Business Machines Corporation Tuneable apparatus for microwave processing
US5632921A (en) * 1995-06-05 1997-05-27 The Rubbright Group, Inc. Cylindrical microwave heating applicator with only two modes
WO1999013689A1 (en) * 1997-09-08 1999-03-18 The Rubbright Group, Inc. Tubular microwave applicator
US6320170B1 (en) 1999-09-17 2001-11-20 Cem Corporation Microwave volatiles analyzer with high efficiency cavity
US6521876B2 (en) 1999-09-17 2003-02-18 Cem Corporation Microwave volatiles analyzer with high efficiency cavity
US20020179596A1 (en) * 2001-06-01 2002-12-05 Tracy Michael L. Microwave applicator for heating a moving fluid
US6740858B2 (en) * 2001-06-01 2004-05-25 Communications And Power Industries, Inc. Microwave heating applicator for heating a moving fluid
US20080233020A1 (en) * 2007-03-15 2008-09-25 Capital Technologies, Inc. Processing apparatus with an electromagnetic launch
US7518092B2 (en) 2007-03-15 2009-04-14 Capital Technologies, Inc. Processing apparatus with an electromagnetic launch
US20090179028A1 (en) * 2007-03-15 2009-07-16 Purta David A Processing apparatus with an electromagnetic launch
WO2009116923A1 (en) * 2008-03-19 2009-09-24 Skåne-Möllan Ab Device and method for microwave treatment of grain
US20120241445A1 (en) * 2009-09-01 2012-09-27 Lg Electronics Inc. Cooking appliance employing microwaves
EP3074201A4 (en) * 2013-11-26 2017-08-09 Industrial Microwave Systems LLC Tubular waveguide applicator
US20170226466A1 (en) * 2014-08-05 2017-08-10 Biogreen 360, Inc. Organic Waste Digester System
US10563165B2 (en) * 2014-08-05 2020-02-18 Biogreen 360, Inc. Organic waste digester system
EP2983455A1 (en) * 2014-08-07 2016-02-10 Industrial Microwave Systems, L.L.C. Tubular choked waveguide applicator
US9642194B2 (en) 2014-08-07 2017-05-02 Industrial Microwave Systems, L.L.C. Tubular choked waveguide applicator
US11491490B1 (en) 2021-05-27 2022-11-08 Biogreen 360, Inc. Organic waste management system

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