US3131241A - Method for making an improved ear plug - Google Patents

Method for making an improved ear plug Download PDF

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US3131241A
US3131241A US182693A US18269362A US3131241A US 3131241 A US3131241 A US 3131241A US 182693 A US182693 A US 182693A US 18269362 A US18269362 A US 18269362A US 3131241 A US3131241 A US 3131241A
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latex
mold
shell
sleeve
rod
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US182693A
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Emanuel S Mendelson
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/06—Protective devices for the ears
    • A61F11/08—Protective devices for the ears internal, e.g. earplugs

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  • the invention relates to a method of making a plug for the external orifice of the ear canal, and is furthermore particularly concerned ywith devices lwhich may be inserted into the human ear for the purpose of establishing protection for the ear against excessively loud ambient sounds, protection of the outer ear canal against invasion by water yor other foreign materials, and finally for the purpose of establishing an yair-tight coupling of the external auditory canal to sources of foreign acoustic intelligence.
  • the unique feature in the attainment of these goals is the development of a suitable method for the manufacture of an ear insert device Iwhich is better than any existing device in that this particular plug is completely air-tight.
  • Prior ear insert devices are designed primarily for only one or two of the stated types of uses. They were usually made from solid or relatively stiff materials having only a small degree of localized resilience. Yieldability of the material was too small to prevent differential pressure areas against the sensitive tissues of the skin, thereby resulting in irritations which frequently resulted in iniiammatory conditions of the ear.
  • One of the objects of this invention is to provide a method for the manufacture of a hollow ear plug whereby it has a high degree of yieldability.
  • Another object of this invention is to provide a plug which obviates the leakage of air between the ear and the insert.
  • a further object of this invention is to provide a multipurpose ear plug which is capable of being used to defend against loud noises, to insure protection against water and to become an artificial auditory canal to receive hearing aids, telephone receivers and the like.
  • a still further object is to provide an improved plug that is simple and compact in construction.
  • ⁇ A still further object is to provide an improved ear plug comprising .an outer shell of latex rubber of a shape corresponding to the individual wearers ear for effectively sealing the ear drum from the outside of the ear and, at the same time, being comfortable to Wear.
  • a still Kfurther object is the provision o-f an articial auditory canal having the attribute and functional etliciency of the natural canal, without the usual disadvantages -associated with ear molds, sensory mechanisms and related devices.
  • FIG. l is an enlarged side elevational view of the plug and a sectional View of a typical human ear showing the plug inserted therein.
  • FIG. 2 is a longitudinal sectional view along the line 2--2 of FIG. I1.
  • FIGS. 3 through 6 show the various steps incorporated in the method of making the plug.
  • the ear plug comprises an outer shell 1 preferably formed of soft rubber, either natural or synthetic, being generally shaped to tit an entire ear canal and having its smaller and hereafter designated as the ⁇ inner end slightly rounded as at 3 ⁇ and its outer peripheral sur-face undulated as at 5.
  • This series of spaced undulations around the outer periphery of the shell enable -it to be custom-iitted to the wall of the auditory canal so that only a minimum of pressure is required to be applied to the aforesaid wall in order to enable the plug to be completely supported by the ear.
  • the opposite end of the shell 1 is closed by the grommet or washer 7, having an .aperture ⁇ 8 therein, which is glued or otherwise secured to its -Wall 9 after lthe plug has been inserted into the outer shell of the ear 11, substantially as shown, thus forming a confined annular space 13 on the interior.
  • An elongated channel 15, being enclosed -by a sleeve 17, extends from the aperture 8 in the washer 7 along the longitudinal ⁇ ,axis Iof the shell l1 substantially ⁇ as illustrated in FIG. 2.
  • the sleeve 17 is composed of latex 18, woven thread 16, such as nylon or the like, and a second coating of latex 18.
  • ⁇ One end of sleeve 17 is secured to the end wall 3 of the shell and the other end of the said sleeve is secured to the washer 7 by gluing or other such means substantially as shown in FIG. 2.
  • This open channel 15 through the shell ⁇ 1 provides a sound communicating passageway into the auditory meatus of the ear.
  • the said annular space 13 contains air under slight superatrnospheric pressure at body temperature, suicient to gently hold the exterior wall in shape, but permitting it to yeild resiliently under slight inward pressure applied from the exterior.
  • the device if it has the approximate general shape of an individuals ear canal, as to length, diameter and curvature, will, when placed inside the ear canal, automatically adjust itself to the contour of the wall 19 as illustrated in FIG. 1.
  • the material be relatively thin and that the resiliency of the device be supplied principally by the air pressure Within the space 13. If the resiliency of the device were furnished primarily by the properties of the material itself, an equalization of pressure along the canal wall 19would not be possible. Pressure would then be localized because there would be no means for neutralizing unequal forces from one point to the other. ⁇ With devices made out of latex in accordance with the present invention, local pressure spots are promptly equalized through the medium of the air in space 13'.
  • FIGURES i3 through 6 A method for the preparation of the device described above is shown in FIGURES i3 through 6.
  • a rod 21 is immersed into a container of latex 18. After-wards, the latex layer on the rod is covered with stiff nylon thread y16. The rod isthen inserted again into the container of latex whereby sleeve 17 is .formed on the rod.
  • the outer shell 1 is formed in the mold as shown in FIGURE 4.
  • the latex is poured into the mold and then allowed to drain off vfrom the mold. This step is repeated until a layer Iof latex lis formed on the inside of the mold.
  • Another way of forming the latex shell is by repeatedly dipping the mold, which h-as been machined into the desired shape from a block of plastic or the like, into a beaker of latex until the shell is Iformed on the outside of the mold, as shown in FIGURE 5.
  • the rod 21 encased within the latex-nylon-latex sleeve 17 is placed longitudinally through the center of the mold (FIG.
  • the rod Z1 is slipped jfrom the sleeve 17 forming an elongated channel 15.
  • the shell 1 is removed from the mold and trimmed to remove the eXcess'lateX.
  • a hole 31 must be cut longitudinally through the center of the mold so that the rod 21 and sleeve 17 can be positioned therein so that the latex covering 18 makes contact with the end 3 of shell 1.
  • the rod is removed from the sleeve as described hereinabove.
  • 'Ihe shell i1 may have the end 7 adapted to receive a -removable plug 2S, having lportion 27 being adapted to slida-bly and removably fit into the channel 15.
  • this device becomes an ear defender against loud ambient noises.
  • a hearing aid or other ⁇ such device (not shown) may be substituted for the plug 25.
  • a method 'for the manufacture of an ear device so shaped to tit an entire ear canal comprising Ithe following steps:
  • a method ⁇ for the manufacture of an ear device soy shaped to t ⁇ an entire ear canal comprising the following steps:
  • a method for the manufacture of an ear device so shaped to fit an entire ear canal comprising -the yfollowing steps:

Description

April 28, 1964 E. s. MENDELsoN METHOD FOR MAKING AN IMPROVEO EAR PLUG 2 Sheets-Sheet 1 Original Filed Jan. 27, 1960 INVENTOR.
S, MENDELSON EMAMuf-:Ll
ML. M,
ATTORNEY April 28, 1964 E. s. MENDELSON 3,131,241
METHOD FOR MAKING AN IMPROVED EAR PLUG original Filed Jan. 27, 1960 2 sheets-sheet 2 Jy v INVENTOR.
EMANUEL S. MENDELSON` MQM/ AT TORNEY United States Patent O 3 Claims. (Cl. 264-257) (Granted under Title 35, U.S. Code (1952), see. 266) The invention described herein may Ibe manufactured and used by or for the Government of the United States of America for governmental purposes 4without the payment of any royalties thereon or therefor.
This is a divisional application of rny copending applicati-on Serial Number 5,081, filed January 27, 1960, now abandoned. i
The invention relates to a method of making a plug for the external orifice of the ear canal, and is furthermore particularly concerned ywith devices lwhich may be inserted into the human ear for the purpose of establishing protection for the ear against excessively loud ambient sounds, protection of the outer ear canal against invasion by water yor other foreign materials, and finally for the purpose of establishing an yair-tight coupling of the external auditory canal to sources of foreign acoustic intelligence. The unique feature in the attainment of these goals is the development of a suitable method for the manufacture of an ear insert device Iwhich is better than any existing device in that this particular plug is completely air-tight.
Prior ear insert devices are designed primarily for only one or two of the stated types of uses. They were usually made from solid or relatively stiff materials having only a small degree of localized resilience. Yieldability of the material was too small to prevent differential pressure areas against the sensitive tissues of the skin, thereby resulting in irritations which frequently resulted in iniiammatory conditions of the ear.
One of the objects of this invention is to provide a method for the manufacture of a hollow ear plug whereby it has a high degree of yieldability.
Another object of this invention is to provide a plug which obviates the leakage of air between the ear and the insert.
A further object of this invention is to provide a multipurpose ear plug which is capable of being used to defend against loud noises, to insure protection against water and to become an artificial auditory canal to receive hearing aids, telephone receivers and the like.
A still further object is to provide an improved plug that is simple and compact in construction.
\A still further object is to provide an improved ear plug comprising .an outer shell of latex rubber of a shape corresponding to the individual wearers ear for effectively sealing the ear drum from the outside of the ear and, at the same time, being comfortable to Wear.
A still Kfurther object is the provision o-f an articial auditory canal having the attribute and functional etliciency of the natural canal, without the usual disadvantages -associated with ear molds, sensory mechanisms and related devices.
Other objects and many of the attendant advantages of this invention will be readily appreciated as the same .becomes better understood by reference to the following detailed description which is considered in connection with the accompanying drawing wherein:
FIG. l is an enlarged side elevational view of the plug and a sectional View of a typical human ear showing the plug inserted therein.
"ice
FIG. 2 is a longitudinal sectional view along the line 2--2 of FIG. I1.
FIGS. 3 through 6 show the various steps incorporated in the method of making the plug. g
As shown in FIG. 1, the ear plug comprises an outer shell 1 preferably formed of soft rubber, either natural or synthetic, being generally shaped to tit an entire ear canal and having its smaller and hereafter designated as the `inner end slightly rounded as at 3` and its outer peripheral sur-face undulated as at 5. This series of spaced undulations around the outer periphery of the shell enable -it to be custom-iitted to the wall of the auditory canal so that only a minimum of pressure is required to be applied to the aforesaid wall in order to enable the plug to be completely supported by the ear.
The opposite end of the shell 1 is closed by the grommet or washer 7, having an .aperture `8 therein, which is glued or otherwise secured to its -Wall 9 after lthe plug has been inserted into the outer shell of the ear 11, substantially as shown, thus forming a confined annular space 13 on the interior.
An elongated channel 15, being enclosed -by a sleeve 17, extends from the aperture 8 in the washer 7 along the longitudinal `,axis Iof the shell l1 substantially `as illustrated in FIG. 2. The sleeve 17 is composed of latex 18, woven thread 16, such as nylon or the like, and a second coating of latex 18. `One end of sleeve 17 is secured to the end wall 3 of the shell and the other end of the said sleeve is secured to the washer 7 by gluing or other such means substantially as shown in FIG. 2. This open channel 15 through the shell `1 provides a sound communicating passageway into the auditory meatus of the ear. The sleeve 17, strengthened by the nylon thread, aids in the insertion of the shell into the ear canal.
The said annular space 13 contains air under slight superatrnospheric pressure at body temperature, suicient to gently hold the exterior wall in shape, but permitting it to yeild resiliently under slight inward pressure applied from the exterior. As a result, the device, if it has the approximate general shape of an individuals ear canal, as to length, diameter and curvature, will, when placed inside the ear canal, automatically adjust itself to the contour of the wall 19 as illustrated in FIG. 1. vIn order to effect this result, it is necessary that the material be relatively thin and that the resiliency of the device be supplied principally by the air pressure Within the space 13. If the resiliency of the device were furnished primarily by the properties of the material itself, an equalization of pressure along the canal wall 19would not be possible. Pressure would then be localized because there would be no means for neutralizing unequal forces from one point to the other. \With devices made out of latex in accordance with the present invention, local pressure spots are promptly equalized through the medium of the air in space 13'.
A method for the preparation of the device described above is shown in FIGURES i3 through 6.
i A rod 21 is immersed into a container of latex 18. After-wards, the latex layer on the rod is covered with stiff nylon thread y16. The rod isthen inserted again into the container of latex whereby sleeve 17 is .formed on the rod.
The outer shell 1 is formed in the mold as shown in FIGURE 4. The latex is poured into the mold and then allowed to drain off vfrom the mold. This step is repeated until a layer Iof latex lis formed on the inside of the mold. Another way of forming the latex shell is by repeatedly dipping the mold, which h-as been machined into the desired shape from a block of plastic or the like, into a beaker of latex until the shell is Iformed on the outside of the mold, as shown in FIGURE 5. The rod 21 encased within the latex-nylon-latex sleeve 17 is placed longitudinally through the center of the mold (FIG. 4) whereby the layer of latex =18 on the rod contacts the shell at the inner end 3 and is tightly bonded thereto. After a layer o-f latex has formed along the inside of the mold, the rod Z1 is slipped jfrom the sleeve 17 forming an elongated channel 15. The shell 1 is removed from the mold and trimmed to remove the eXcess'lateX.
If the mold is to be dipped into Ia beaker of latex, a hole 31 must be cut longitudinally through the center of the mold so that the rod 21 and sleeve 17 can be positioned therein so that the latex covering 18 makes contact with the end 3 of shell 1. The rod is removed from the sleeve as described hereinabove.
'Ihe shell i1 may have the end 7 adapted to receive a -removable plug 2S, having lportion 27 being adapted to slida-bly and removably fit into the channel 15. By these means with the removal plug inserted into the channel, this device becomes an ear defender against loud ambient noises. In like manner a hearing aid or other `such device (not shown) may be substituted for the plug 25.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is 4.therefore to be understood that kwithin the scope of the appended claims the invention may be practiced otherwise than as specifically described herein.
What is claimed is:
r1. A method 'for the manufacture of an ear device so shaped to tit an entire ear canal, said method comprising Ithe following steps:
(1) providing a mold, said mold being undulated along the peripheral surface and being rounded at one end thereof; Y
(2) placing a sleeve of nylon over a rod;
(3) covering the sleeve of nylon with a layer of latex;
(4) positioning the rod longitudinally along the center of the mold whereby one end of the rod c-ontacts the rounded end of the mold;
(5) covering the mold with a coating of latex to form a shell of latex thereon, said shell having the shape of the mold;
(6) bonding the latex shell to the latex covering the nylon sleeve at the rounded end of the mold;
(7) slipping the rod from the nylon sleeve to form a hollow elongated channel, bounded by the nylon sleeve covered with latex, along the longitudinal axis yof the latex shell;
`(8) removing the shell of latex from the mold.
2. A method `for the manufacture of an ear device soy shaped to t `an entire ear canal, said method comprising the following steps:
( 1) providing a mold, said mold being undulated along the peripheral surface and being rounded at one end thereof;
(2) placing a sleeve of nylon over a rod;
( 3) covering the sleeve of nylon with a layer of latex;
(i4) positioning the rod longitudinally along the center of the mold whereby one end of the rod contacts the rounded end of the mold;
(5) dipping the mold into latex to form a shell of latex thereon, said shell having the shape of the mold;
(6) bonding the latex shell to the latex covering Vthe nylon sleeve at the rounded end of the mold;
(7) slipping the rod from the nylon sleeve to form a hollow elongated channel, bounded by the nylon sleeve covered with latex, along the longitudinal axis of the latex shell;
(8) removing the shell of latex Ifrom the mold.
3. A method for the manufacture of an ear device so shaped to fit an entire ear canal, said method comprising -the yfollowing steps:
(1) providing a mold, said mold being undulated along the peripheral surface and being rounded at one end thereof;
(2) placing a sleeve of nylon over a rod;
(3) covering the -sleeve of nylon with a layer of latex;
(4) positioning Vthe rod longitudinally along the center of the mold whereby one end of the rod cont-acts the rounded end of the mold;
(5) repeatedly pouring latex into the mold to form a shell of latex thereon, said shell having the shape of the mold;
(6) bonding the latex shell ,to the latex covering the nylon sleeve at the rounded end of the mold;
(7 slipping the rod from the nylon sleeve to form a hollow elongated channel, bounded by the nylon sleeve covered with latex, along the longitudinal axis of the latex shell;
(8) removing the shell of latex from the mold.
References Cited in the tile of this patent UNITED STATES PATENTS 2,206,438 Trexler July 2, 1940 2,291,786 '-Beal Aug. 4, 1942 2,888,921 Nielson etal lune 2, 1959 2,914,181 Naftulin etal Nov. 24, 1959 3,050,066 Koehn Aug. 2l, 1962

Claims (1)

1. A METHOD FOR THE MANUFACTURE OF AN EAR DEVICE SO SHAPED TO FIT AN ENTIRE EAR CANAL, SAID METHOD COMPRISING THE FOLLOWING STEPS; (1) PROVIDING A MOLD, SAID MOLD BEING UNDULATED ALONG THE PERIPHERAL SURFACE AND BEING ROUNDED AT ONE END THEREOF; (2) PLACING A SLEEVE OF NYLON OVER A ROD; (3) COVERING THE SLEEVE OF NYLON WITH A LAYER OF LATEX; (4) POSITIONING THE ROD LONGITUDINALLY ALONG THE CENTER OF THE MOLD WHEREBY ONE END OF THE ROD CONTACTS THE ROUNDED END OF THE MOLD; (5) COVERING THE MOLD WITH A COATING OF LATEX TO FORM A SHELL OF LATEX THEREON, SAID SHELL HAVING THE SHAPE OF THE MOLD; (6) BONDING THE LATEX SHELL TO THE LATEX COVERING THE NYLON SLEEVE AT THE ROUNDED END OF THE MOLD; (7) SLIPPING THE ROD FROM THE NYLON SLEEVE TO FORM A HOLLOW ELONGATED CHANNEL, BONDED BY THE NYLON SLEEVE COVERED WITH LATEX, ALONG THE LONGITUDINAL AXIS OF THE LATEX SHELL; (8) REMOVING THE SHELL OF LATEX FROM THE MOLD.
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440314A (en) * 1966-09-30 1969-04-22 Dow Corning Method of making custom-fitted earplugs for hearing aids
US3882848A (en) * 1974-01-24 1975-05-13 American Electromedics Corp Test probe for an impedance audiometer
US4006796A (en) * 1973-12-21 1977-02-08 U.S. Philips Corporation Earpiece which substantially consists of a thin-walled flexible capsule filled with a liquid medium
US4122841A (en) * 1976-01-09 1978-10-31 American Electromedics Corporation Probe tip
US4353364A (en) * 1979-01-18 1982-10-12 Woods Thomas J Ear acoustical attenuating device
US4582053A (en) * 1984-01-06 1986-04-15 Wilson Garnet J E Acoustic ear plug
US4878560A (en) * 1989-03-16 1989-11-07 Scott Robert T Earmold
US5008058A (en) * 1988-01-19 1991-04-16 Siemens Aktiengesellschaft Method for manufacturing an otoplastic or an ear adaptor member
US5467784A (en) * 1994-08-16 1995-11-21 Mobley; J. Phil Pressure-regulating ear plug
US5819745A (en) * 1994-08-16 1998-10-13 House Ear Institute Pressure-regulating ear plug
US6484726B1 (en) 2000-06-30 2002-11-26 3M Innovative Properties Company Articulating earplug
US20030029460A1 (en) * 2001-08-10 2003-02-13 Jim Tiemens Extruded earplug
DE10158648A1 (en) * 2001-11-30 2003-06-18 Aweco Appliance Sys Gmbh & Co Hearing aid has ventilation duct between hollow casing and cover plate, with insulation element
FR2845308A1 (en) * 2002-10-04 2004-04-09 Pascal Roussel Ear protector manufacturing procedure uses impression taken from auditory canal by an elastomer material on a holder with a piston
US20050094835A1 (en) * 2003-11-03 2005-05-05 Marc Doty Low sound attenuating hearing protection device
US20060213524A1 (en) * 2005-03-25 2006-09-28 Edwin Woo In-ear device
US20070183606A1 (en) * 2003-11-03 2007-08-09 Doty Marc L Low sound attenuating hearing protection device with filter arrangement
US7740104B1 (en) * 2006-01-11 2010-06-22 Red Tail Hawk Corporation Multiple resonator attenuating earplug
US20150059775A1 (en) * 2013-09-04 2015-03-05 Hung-Wen Hung Earplug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2206438A (en) * 1937-05-05 1940-07-02 William H Trexler Inflatable toric article and method of making the same
US2291786A (en) * 1940-08-03 1942-08-04 American Anode Inc Method of making rubber articles
US2888921A (en) * 1956-03-21 1959-06-02 Alfred Schrider Ear inserts
US2914181A (en) * 1957-05-10 1959-11-24 Michael Reese Res Foundation I Plastic tube connections
US3050066A (en) * 1958-12-31 1962-08-21 Wilbur R Koehn Retention catheters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2206438A (en) * 1937-05-05 1940-07-02 William H Trexler Inflatable toric article and method of making the same
US2291786A (en) * 1940-08-03 1942-08-04 American Anode Inc Method of making rubber articles
US2888921A (en) * 1956-03-21 1959-06-02 Alfred Schrider Ear inserts
US2914181A (en) * 1957-05-10 1959-11-24 Michael Reese Res Foundation I Plastic tube connections
US3050066A (en) * 1958-12-31 1962-08-21 Wilbur R Koehn Retention catheters

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440314A (en) * 1966-09-30 1969-04-22 Dow Corning Method of making custom-fitted earplugs for hearing aids
US4006796A (en) * 1973-12-21 1977-02-08 U.S. Philips Corporation Earpiece which substantially consists of a thin-walled flexible capsule filled with a liquid medium
US3882848A (en) * 1974-01-24 1975-05-13 American Electromedics Corp Test probe for an impedance audiometer
US4122841A (en) * 1976-01-09 1978-10-31 American Electromedics Corporation Probe tip
US4353364A (en) * 1979-01-18 1982-10-12 Woods Thomas J Ear acoustical attenuating device
US4582053A (en) * 1984-01-06 1986-04-15 Wilson Garnet J E Acoustic ear plug
US5008058A (en) * 1988-01-19 1991-04-16 Siemens Aktiengesellschaft Method for manufacturing an otoplastic or an ear adaptor member
US4878560A (en) * 1989-03-16 1989-11-07 Scott Robert T Earmold
US5467784A (en) * 1994-08-16 1995-11-21 Mobley; J. Phil Pressure-regulating ear plug
US5819745A (en) * 1994-08-16 1998-10-13 House Ear Institute Pressure-regulating ear plug
US6484726B1 (en) 2000-06-30 2002-11-26 3M Innovative Properties Company Articulating earplug
US20030029460A1 (en) * 2001-08-10 2003-02-13 Jim Tiemens Extruded earplug
DE10158648A1 (en) * 2001-11-30 2003-06-18 Aweco Appliance Sys Gmbh & Co Hearing aid has ventilation duct between hollow casing and cover plate, with insulation element
FR2845308A1 (en) * 2002-10-04 2004-04-09 Pascal Roussel Ear protector manufacturing procedure uses impression taken from auditory canal by an elastomer material on a holder with a piston
EP1433449A1 (en) * 2002-10-04 2004-06-30 Pascal Roussel Hearing device and method for producing the same
US20050094835A1 (en) * 2003-11-03 2005-05-05 Marc Doty Low sound attenuating hearing protection device
WO2005041830A3 (en) * 2003-11-03 2006-08-10 Cabot Safety Intermediate Corp Low sound attenuating hearing protection device
US20070183606A1 (en) * 2003-11-03 2007-08-09 Doty Marc L Low sound attenuating hearing protection device with filter arrangement
US8054985B2 (en) 2003-11-03 2011-11-08 3M Innovative Properties Company Low sound attenuating hearing protection device with filter arrangement
US7697706B2 (en) 2003-11-03 2010-04-13 3M Innovative Properties Company Low sound attenuating hearing protection device
US20060213524A1 (en) * 2005-03-25 2006-09-28 Edwin Woo In-ear device
US8343397B2 (en) * 2005-03-25 2013-01-01 Sperian Hearing Protection, Llc Method of forming an in-ear device
US7740104B1 (en) * 2006-01-11 2010-06-22 Red Tail Hawk Corporation Multiple resonator attenuating earplug
WO2008100407A3 (en) * 2007-02-09 2008-11-06 Cabot Safety Intermediate Corp Low sound attenuating hearing protection device with filter arrangement
WO2008100407A2 (en) * 2007-02-09 2008-08-21 3M Innovative Properties Company Low sound attenuating hearing protection device with filter arrangement
US20150059775A1 (en) * 2013-09-04 2015-03-05 Hung-Wen Hung Earplug

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