US3202150A - Filter attachment for a pressurized breathing apparatus - Google Patents

Filter attachment for a pressurized breathing apparatus Download PDF

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Publication number
US3202150A
US3202150A US201521A US20152162A US3202150A US 3202150 A US3202150 A US 3202150A US 201521 A US201521 A US 201521A US 20152162 A US20152162 A US 20152162A US 3202150 A US3202150 A US 3202150A
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Prior art keywords
mask
filter
regulator
fitting
container
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US201521A
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Arthur E Miller
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Scott Technologies Inc
Avox Systems Inc
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Scott Aviation Inc
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Priority to US201521A priority Critical patent/US3202150A/en
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Assigned to FIGGIE INTERNATIONAL INC. reassignment FIGGIE INTERNATIONAL INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JUNE 1, 1981. Assignors: A-T-O INC.
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B7/00—Respiratory apparatus
    • A62B7/02—Respiratory apparatus with compressed oxygen or air
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/35—Respirators and register filters

Definitions

  • This invention relates to the combination of a filter and a breathing apparatus, said combination being so constituted that the person who is wearing the combination may either breathe in ambient air which was originally slightly contaminated but which has been completely purified by .a filter or, optionally, may cut 01f this flow of ambient air through the filter and breathe in only breathing fluid that is supplied by a breathing apparatus from a tank of compressed breathing fluid.
  • the principal object of the invention is to enable a person, who is approaching an area which might be contaminated, to breathe in either pure air or lightly contaminated, ambient air through a purifying filter so long as the contaminants in the ambient air are not greater than the filter can adequately handle, and then, if or when the percentage of contaminants becomes excessive, to switch over from the filter to a breathing apparatus that is supplied by pure breathing air from a pressurized tank.
  • FIGURE 1 is a front elevation of the upper torso of a fireman equipped with my complete invention with all of its component part connected together.
  • FIGURE 2 is a similar front elevation, but showing the filter 8 disconnected from the pressurized breathing apparatus.
  • FIGURE 3 is a side elevation of the fireman equipped with my complete invention with all of its component parts connected together, as in FIGURE 1.
  • FIGURE 4 is a fragmentary, horizontal section through the filter 8, taken on line 4-4, FIGURE 3.
  • the filter 8 is provided with a short, corrugated hose 13 whose distal end is tubularly connected to the lateral arm 14 of a metal T pipe fitting 15.
  • the coupling nut 16 of the T pipe fitting 15 is then screwed onto the demand regulator 7, while the coupling nut 17 of the mask hose 18 is screwed onto the upper end of said T pipe fitting 15, the upper end of said mask hose 18 being tubularly connected with a mask 20.
  • An exhalation valve 21 is connected to the mask.
  • the filter 8 isrconstructed of a cylindrical, metal, replaceable canister 22 whichis screwed into a metal, L, pipe fitting 23 in the lower bore of which is staked, or otherwise secured, a check valve 24.
  • This check valve 24 allows ambient air to be sucked in through the corrugated, paper, filter element 25 and then to pass through said check valve 24 and thence into the short, corrugated, filter hose 13 tothe T pipe fitting 15. Any reverse fiow is, of course, prevented by said check valve 24.
  • FIGURE 2 illustrates how the pressurized breathing apparatuscan be used as a commercial unit independently of the filter 8.
  • FIGURE 3 illustrates :how a large quantity of standard pressurized breathing equipment can be carried on hand by the fire department, and, in addition, a limited number of filter assemblies kept available, any one of which can be joined to any one of the pressurized breathing apparatii, or idly hung of the chest strap 10 of the harness 5 (as in FIG- URE 2) for use in doubtful situations where itmight possibly be advantageous to have a contaminant filter available.
  • Portable breathing apparatus comprising, incombination, a fiace mask, an exhalation valve connected to said mask, a filter tubularly connected .to said mask for supplying filtered ambient air to said mask, a container of compressed breathing fluid, a demand regulator of the positive pressure type tubularly connected to said container and to said mask for supplying breathing fluid to .said mask from said container on demand, and a check valve in the tubular connection between said filter and said mask preventing the escape of breathing fluid from said container through said filter, said filter, said container and said regulator being adapted to be carried by the user, wherein the tubular connections between said filter and said mask and between said regulator and said mask include a T fitting, means detachably connecting said fitting to said regulator, a first hose interconnecting said filter and said fitting, a second hose inter- '3 8 connecting said mask and saidjfitting, and means detachably connecting said second hose to said fitting both said means being interchangeable whereby said second hose can be detached from said fitting and attached to said regulator upon det
  • Portable breathing apparatus comprising, in com- .bination, a face mask, an exhalation valve connected to said mask, a filter tubularly connected to said mask for supplying filtered ambient air to said mask, a container of-compressed breathing fluid, a demand regulator of the positive pressure type tubularly connected to said container and to said mask for supplying breathing fluid to said mask from said container on demand, and a check valve in the tubular connection between said filter and said mask preventing the escape of breathing fluid from said container through said filter, said filter, said container and said regulator being adapted'to be carried by the user, wherein the tubular connections between said filter and said mask and between said regulator and said mask include :a first hose connected to said filter, a second hose connected to said mask, means including a fitting carried by' said regulator for detachably connecting said'first hose to said second hose, thereby supplying filtered ambient air to said mask, and means detachably connected said second hose to said regulator for supplying breathing fluid to said mask from said container.

Description

Aug. 24, 1965 A. E. MILLER 3,202,150
FILTER ATTACHMENT FOR A PRESSURIZED BREATHING APPARATUS Filed June 11, 1962 2 Sheets-Sheet 1 INVENTOR GzwifiPi'E M27??? Alig. 24, 1965 MILLER 3,202,150
FILTER ATTACHMENT FOR A PRESSURIZED BREATHING APPARATUS Filed June 11, 1962 2 Sheets-Sheet 2 auri fizu E Ali/fer BY AT T ORNE Y 3 vs Y I NVENTOR. R
United States Patent,
I s 202 150 FILTER ATTACHMENT FOR A PRESSURIZED BREATHING APPARATUS Arthur E. Miller, Buifalo, N.Y., assiguor to Scott Aviation This invention relates to the combination of a filter and a breathing apparatus, said combination being so constituted that the person who is wearing the combination may either breathe in ambient air which was originally slightly contaminated but which has been completely purified by .a filter or, optionally, may cut 01f this flow of ambient air through the filter and breathe in only breathing fluid that is supplied by a breathing apparatus from a tank of compressed breathing fluid.
The principal object of the invention is to enable a person, who is approaching an area which might be contaminated, to breathe in either pure air or lightly contaminated, ambient air through a purifying filter so long as the contaminants in the ambient air are not greater than the filter can adequately handle, and then, if or when the percentage of contaminants becomes excessive, to switch over from the filter to a breathing apparatus that is supplied by pure breathing air from a pressurized tank.
Other objects of the invention and practical solutions thereof are described in detail in the following specifications and in the accompanying drawings, wherein:
FIGURE 1 is a front elevation of the upper torso of a fireman equipped with my complete invention with all of its component part connected together.
FIGURE 2 is a similar front elevation, but showing the filter 8 disconnected from the pressurized breathing apparatus.
FIGURE 3 is a side elevation of the fireman equipped with my complete invention with all of its component parts connected together, as in FIGURE 1.
FIGURE 4 is a fragmentary, horizontal section through the filter 8, taken on line 4-4, FIGURE 3.
For convenience, I will describe my invention precisely as it is illustrated, but it is to be definitely understood that the breadth of my invention is to be measured solely by its intrinsic novelty and by the scope of the appended claims.
I will further assume that the user of my invention is a fireman and that he has been ordered to move into an \area which might be contaminated by nuclear fall-out,
and that he has prepared himself to go a maximum distance and directly to the heart of the catastrophe, after leaving an outlying region where he is sure that the ambient air is pure.
Now as he i about to enter the area where the ambient air might be contaminated, he dons a harness 5 which carries a pressurized air tank 6 on his back, and a demand regulator 7 and a filter 8 on his chest, said regulator and filter being hung on the chest strap 10 of the harness 5. He then connects the high-pressure, air-hose 11 of the air tank shut-off valve 12 with aforesaid demand regulator 7.
The filter 8 is provided with a short, corrugated hose 13 whose distal end is tubularly connected to the lateral arm 14 of a metal T pipe fitting 15. The coupling nut 16 of the T pipe fitting 15 is then screwed onto the demand regulator 7, while the coupling nut 17 of the mask hose 18 is screwed onto the upper end of said T pipe fitting 15, the upper end of said mask hose 18 being tubularly connected with a mask 20. An exhalation valve 21 is connected to the mask. (This mask 20 3 ,292,150 Patented Aug. 24, 1965 2 a can, of course, be replaced by an oro-na-sal mask orby a plain mouth piece, if desired.) i i As shown in FIGURE 4, the filter 8 isrconstructed of a cylindrical, metal, replaceable canister 22 whichis screwed into a metal, L, pipe fitting 23 in the lower bore of which is staked, or otherwise secured, a check valve 24. This check valve 24 allows ambient air to be sucked in through the corrugated, paper, filter element 25 and then to pass through said check valve 24 and thence into the short, corrugated, filter hose 13 tothe T pipe fitting 15. Any reverse fiow is, of course, prevented by said check valve 24. I Operation In FIGURES 1 and 3 we will at first assume that the shut-01f valve 12 of. the pressurized air tank 6 isclosed.
We will also assume in these FIGURES l and 3 that the fireman has left the area where the purity of the ambient air is unquestionable and that he is about to enter an area which may be at least lightly contaminated Withfor instance, atomic tall-out. He is, therefore, at this time about to breathe ambient air in through the filter 8 whose filter element is capable of removing small percentages of contaminants.
It is to be borne in mind that, at this time, he is not depleting the supply of compressed air in his tank 6, and hence is lengthening his radius of operations by put-ting off any breathing from said air tank just' as long as it is safe to do so.
Assuming that he is now moving straight to the center of the disaster, it is to be expected that, at some point or other, he will learn from his Geiger or other contaminant counter, that the contaminant percentage is too high for the filter 8 to adequately handle the difiiculty. At this point the fireman opens the shut-off valve 12 of his air tank 6 and also adjusts hi demand pressure regulator to provide a positive pressure. This prevents any inhalation pressure from opening the check valve 24 of the filter :8, and hence all the air he then breathes is supplied from the compressed air tank 6.
Dual use of breiathz'ng apparatus FIGURE 2 illustrates how the pressurized breathing apparatuscan be used as a commercial unit independently of the filter 8. In other Words, this FIGURE 3 illustrates :how a large quantity of standard pressurized breathing equipment can be carried on hand by the fire department, and, in addition, a limited number of filter assemblies kept available, any one of which can be joined to any one of the pressurized breathing apparatii, or idly hung of the chest strap 10 of the harness 5 (as in FIG- URE 2) for use in doubtful situations where itmight possibly be advantageous to have a contaminant filter available.
I claim:
1. Portable breathing apparatus comprising, incombination, a fiace mask, an exhalation valve connected to said mask, a filter tubularly connected .to said mask for supplying filtered ambient air to said mask, a container of compressed breathing fluid, a demand regulator of the positive pressure type tubularly connected to said container and to said mask for supplying breathing fluid to .said mask from said container on demand, and a check valve in the tubular connection between said filter and said mask preventing the escape of breathing fluid from said container through said filter, said filter, said container and said regulator being adapted to be carried by the user, wherein the tubular connections between said filter and said mask and between said regulator and said mask include a T fitting, means detachably connecting said fitting to said regulator, a first hose interconnecting said filter and said fitting, a second hose inter- '3 8 connecting said mask and saidjfitting, and means detachably connecting said second hose to said fitting both said means being interchangeable whereby said second hose can be detached from said fitting and attached to said regulator upon detachment of said fitting from said regulator. 72. T-he combination set forth in claim 1, together with a shut-01f valve interposed in the tubular connection between said regulator and said container. 7
3. Portable breathing apparatus comprising, in com- .bination, a face mask, an exhalation valve connected to said mask, a filter tubularly connected to said mask for supplying filtered ambient air to said mask, a container of-compressed breathing fluid, a demand regulator of the positive pressure type tubularly connected to said container and to said mask for supplying breathing fluid to said mask from said container on demand, and a check valve in the tubular connection between said filter and said mask preventing the escape of breathing fluid from said container through said filter, said filter, said container and said regulator being adapted'to be carried by the user, wherein the tubular connections between said filter and said mask and between said regulator and said mask include :a first hose connected to said filter, a second hose connected to said mask, means including a fitting carried by' said regulator for detachably connecting said'first hose to said second hose, thereby supplying filtered ambient air to said mask, and means detachably connected said second hose to said regulator for supplying breathing fluid to said mask from said container. r 7
References Cited by the Examiner UNITED STATES PATENTS 2,764,151 9/56 cu 128-142 2,818,066 12/57 Gliclden 1 2s 142 "2,948,292 8/60 Fitt 12s 142 RICHARD A. GAUDET, Primary Examiner.
JORDAN FRANKLIN, Examiner.

Claims (1)

1. PORTABLE BREATHING APPARATUS COMPRISING, IN COMBINATION, A FACE MASK, AN EXHALATION VALVE CONNECTED TO SAID MASK, A FILTER TUBULARLY CONNECTED TO SAID MASK FOR SUPPLYING FILTERED AMBIENT AIR TO SAID MASK, A CONTAINER OF COMPRESSED BREATHING FLUID, A DEMAND REGULATOR OF THE POSITIVE PRESSURE TYPE TUBULARLY CONNECTED TO SAID CONTAINER AND TO SAID MASK FOR SUPPLYING BREATHING FLUID TO SAID MASK FROM SAID CONTAINER ON DEMAND, AND A CHECK VALVE IN THE TUBULAR CONNECTION BETWEEN SAID FILTER AND SAID MASK PREVENTING THE ESCAPED OF BREATHING FLUID FROM SAID CONTAINER THROUGH SAID FILTER, SAID FILTER, SAID CONTAINER AND SAID REGULATOR BEING ADAPTED TO BE CARRIED BY THE USER, WHEREIN THE TUBULAR CONNECTIONS BETWEEN SAID FILTER AND SAID MASK AND BETWEEN SAID REGULATOR AND SAID MASK INCLUDE A T FITTING, MEANS DETACHABLY CONNECTING SAID FITTING TO SAID REGULATOR, A FIRST HOSE INTERCONNECTING SAID FILTER AND SAID FITTING, A SECOND HOSE INTERCONNECTING SAID MASK AND SAID FITTING, AND MEANS DETACHABLY CONNECTING SAID SECOND HOSE TO SAID FITTING BOTH SAID MEANS BEING INTERCHARGEABLE WHEREBY SAID SECOND HOSE CAN BE DETACHED FROM SAID FITTING AND ATTACHED TO SAID REGULATOR UPON DETACHMENT OF SAID FITTING FROM SAID REGULATOR.
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Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773044A (en) * 1971-03-10 1973-11-20 R Wallace Chemical breathing apparatus with alarm device
US3803817A (en) * 1971-11-02 1974-04-16 Ato Inc Filter assembly
US4019507A (en) * 1974-09-28 1977-04-26 Dragerwerk Aktiengesellschaft Protective breathing device having a filtering apparatus and additional oxygen supply for emergency use
US4108172A (en) * 1975-09-25 1978-08-22 Moore Jr George B Carbon dioxide absorption canister for use with analgesia equipment
US4265238A (en) * 1979-08-16 1981-05-05 The United States Of America As Represented By The Secretary Of The Navy Simulated oxygen breathing apparatus
FR2511605A1 (en) * 1981-08-20 1983-02-25 Figgie Int Inc CONTAINER FOR GAS FILTER
DE3143103A1 (en) * 1981-10-30 1983-05-11 Drägerwerk AG, 2400 Lübeck RESPIRATORY DEVICE AS A FILTER DEVICE WITH ADDITIONAL OXYGEN SUPPLY, ESPECIALLY AS AN ESCAPE DEVICE
FR2543836A1 (en) * 1983-04-06 1984-10-12 Figgie Int Inc RESPIRATORY MASK ASSEMBLY
US4548626A (en) * 1984-04-30 1985-10-22 Figgie International Inc. Particulate air filter assembly
DE3512644A1 (en) * 1985-04-06 1986-10-16 Bartels & Rieger GmbH & Co, 5000 Köln Protective breathing equipment
EP0241188A1 (en) * 1986-04-03 1987-10-14 Racal Safety Limited Improvements in and relating to breathing apparatus
US4793342A (en) * 1987-03-03 1988-12-27 Terry McGovern Gaber Emergency smoke hood and breathing mask
US4841953A (en) * 1986-11-07 1989-06-27 Dodrill Gregg W Auxiliary supply system for a portable self-contained breathing apparatus
US4955373A (en) * 1989-10-16 1990-09-11 Maguire Iii John N Air breathing assembly and air filter attachment therein
WO1992010237A1 (en) * 1990-12-04 1992-06-25 Aran Fire & Safety (Uk) Limited Improvements in or relating to safety helmets
US5318019A (en) * 1992-03-19 1994-06-07 Celaya Marty A Emergency portable oxygen supply unit
US5562092A (en) * 1993-06-14 1996-10-08 George; Eric W. Firefighter's emergency smoke filter
US5592935A (en) * 1995-05-03 1997-01-14 Minnesota Mining And Manufacturing Company Positive/negative air pressure adaptor for use with respirators
EP0781156A1 (en) * 1994-08-31 1997-07-02 Lifepro, Inc. Method of air filtration for fire fighter emergency smoke inhalation protection
EP0803434A2 (en) * 1996-04-23 1997-10-29 HTM SPORT S.p.A. Regulator for underwater breathing apparatus
EP0847296A1 (en) * 1995-09-01 1998-06-17 Besha, Richard G. Personal emergency breathing system for supplied air respirators
US6398266B1 (en) 1999-09-22 2002-06-04 Ballard Medical Products Collapse resistant popoid connector
USD466607S1 (en) 2001-08-27 2002-12-03 Kimberly-Clark Worldwide, Inc. Flexible connector
USD473941S1 (en) 2001-08-27 2003-04-29 Kimberly-Clark Worldwide, Inc. Flexible connecting device
USD476731S1 (en) 2001-08-27 2003-07-01 Kimberly-Clark Worldwide, Inc. Bendable connector
USD486909S1 (en) 2001-08-27 2004-02-17 Kimberly-Clark Worldwide, Inc. Bendable connecting device
US20040182394A1 (en) * 2003-03-21 2004-09-23 Alvey Jeffrey Arthur Powered air purifying respirator system and self contained breathing apparatus
US20060048777A1 (en) * 2003-03-21 2006-03-09 Interspiro, Inc. Apparatus and method for providing breathable air and bodily protection in a contaminated environment
US20070235030A1 (en) * 2003-08-22 2007-10-11 Teetzel James W Self-contained breathing system
US20080053447A1 (en) * 2006-08-29 2008-03-06 Ratajczak John A Adapter for air purifying filter
US7513251B2 (en) * 2005-06-13 2009-04-07 Mel Blum Hand-held potassium super oxide oxygen generating apparatus
US7937775B2 (en) 2005-08-09 2011-05-10 Microtek Medical, Inc. Surgical protective head gear assembly including high volume air delivery system
US20120066819A1 (en) * 2009-02-05 2012-03-22 Materiels Industriels De Securite Assembly for protecting an individual, comprising an insulation suit
RU2461398C1 (en) * 2011-03-21 2012-09-20 Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации Respiratory apparatus
US8919340B2 (en) 2012-03-22 2014-12-30 Mel Blum Hand-held potassium super oxide oxygen generating apparatus
US9998687B2 (en) 2012-09-12 2018-06-12 Bae Systems Information And Electronic Systems Integration Inc. Face mounted extreme environment thermal sensor system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764151A (en) * 1953-06-16 1956-09-25 Scott Aviation Corp Underwater breathing apparatus
US2818066A (en) * 1954-09-16 1957-12-31 Acme Prot Equipment Company Transfer mask
US2948292A (en) * 1956-06-16 1960-08-09 Normalair Ltd Breathing apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764151A (en) * 1953-06-16 1956-09-25 Scott Aviation Corp Underwater breathing apparatus
US2818066A (en) * 1954-09-16 1957-12-31 Acme Prot Equipment Company Transfer mask
US2948292A (en) * 1956-06-16 1960-08-09 Normalair Ltd Breathing apparatus

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773044A (en) * 1971-03-10 1973-11-20 R Wallace Chemical breathing apparatus with alarm device
US3803817A (en) * 1971-11-02 1974-04-16 Ato Inc Filter assembly
US4019507A (en) * 1974-09-28 1977-04-26 Dragerwerk Aktiengesellschaft Protective breathing device having a filtering apparatus and additional oxygen supply for emergency use
US4108172A (en) * 1975-09-25 1978-08-22 Moore Jr George B Carbon dioxide absorption canister for use with analgesia equipment
US4265238A (en) * 1979-08-16 1981-05-05 The United States Of America As Represented By The Secretary Of The Navy Simulated oxygen breathing apparatus
FR2511605A1 (en) * 1981-08-20 1983-02-25 Figgie Int Inc CONTAINER FOR GAS FILTER
DE3230636A1 (en) * 1981-08-20 1983-03-10 Figgie International Inc., 44094 Willoughby, Ohio CONTAINER FOR GLASS FILTER
US4419110A (en) * 1981-08-20 1983-12-06 Figgie International Inc. Gas filter container
DE3143103A1 (en) * 1981-10-30 1983-05-11 Drägerwerk AG, 2400 Lübeck RESPIRATORY DEVICE AS A FILTER DEVICE WITH ADDITIONAL OXYGEN SUPPLY, ESPECIALLY AS AN ESCAPE DEVICE
FR2543836A1 (en) * 1983-04-06 1984-10-12 Figgie Int Inc RESPIRATORY MASK ASSEMBLY
US4548626A (en) * 1984-04-30 1985-10-22 Figgie International Inc. Particulate air filter assembly
DE3512644A1 (en) * 1985-04-06 1986-10-16 Bartels & Rieger GmbH & Co, 5000 Köln Protective breathing equipment
EP0241188A1 (en) * 1986-04-03 1987-10-14 Racal Safety Limited Improvements in and relating to breathing apparatus
US4841953A (en) * 1986-11-07 1989-06-27 Dodrill Gregg W Auxiliary supply system for a portable self-contained breathing apparatus
US4793342A (en) * 1987-03-03 1988-12-27 Terry McGovern Gaber Emergency smoke hood and breathing mask
US4955373A (en) * 1989-10-16 1990-09-11 Maguire Iii John N Air breathing assembly and air filter attachment therein
WO1992010237A1 (en) * 1990-12-04 1992-06-25 Aran Fire & Safety (Uk) Limited Improvements in or relating to safety helmets
US5318019A (en) * 1992-03-19 1994-06-07 Celaya Marty A Emergency portable oxygen supply unit
US5562092A (en) * 1993-06-14 1996-10-08 George; Eric W. Firefighter's emergency smoke filter
EP0781156B1 (en) * 1994-08-31 2003-12-10 Lifepro, Inc. Method of air filtration for fire fighter emergency smoke inhalation protection
EP0781156A1 (en) * 1994-08-31 1997-07-02 Lifepro, Inc. Method of air filtration for fire fighter emergency smoke inhalation protection
US5592935A (en) * 1995-05-03 1997-01-14 Minnesota Mining And Manufacturing Company Positive/negative air pressure adaptor for use with respirators
US5720280A (en) * 1995-05-03 1998-02-24 Minnesota Mining And Manufacturing Company Attenuator for use with respirators
EP0847296A1 (en) * 1995-09-01 1998-06-17 Besha, Richard G. Personal emergency breathing system for supplied air respirators
EP0847296A4 (en) * 1995-09-01 2001-07-18 Besha Richard G Personal emergency breathing system for supplied air respirators
EP0803434A3 (en) * 1996-04-23 1997-12-29 HTM SPORT S.p.A. Regulator for underwater breathing apparatus
EP0803434A2 (en) * 1996-04-23 1997-10-29 HTM SPORT S.p.A. Regulator for underwater breathing apparatus
US6398266B1 (en) 1999-09-22 2002-06-04 Ballard Medical Products Collapse resistant popoid connector
USD473941S1 (en) 2001-08-27 2003-04-29 Kimberly-Clark Worldwide, Inc. Flexible connecting device
USD476731S1 (en) 2001-08-27 2003-07-01 Kimberly-Clark Worldwide, Inc. Bendable connector
USD466607S1 (en) 2001-08-27 2002-12-03 Kimberly-Clark Worldwide, Inc. Flexible connector
USD486909S1 (en) 2001-08-27 2004-02-17 Kimberly-Clark Worldwide, Inc. Bendable connecting device
US20040182394A1 (en) * 2003-03-21 2004-09-23 Alvey Jeffrey Arthur Powered air purifying respirator system and self contained breathing apparatus
US20050022817A1 (en) * 2003-03-21 2005-02-03 Tvi Corporation Breathing apparatus
US20050109341A1 (en) * 2003-03-21 2005-05-26 Alvey Jeffrey A. Powered air purifying respirator system and self contained breathing apparatus
US20060048777A1 (en) * 2003-03-21 2006-03-09 Interspiro, Inc. Apparatus and method for providing breathable air and bodily protection in a contaminated environment
US20060191533A1 (en) * 2003-03-21 2006-08-31 Interspiro, Inc. Powered air purifying respirator system and breathing apparatus
US7380551B2 (en) 2003-03-21 2008-06-03 Tvi Corporation Breathing apparatus
US7543584B2 (en) 2003-03-21 2009-06-09 Interspiro, Inc. Powered air purifying respirator system and breathing apparatus
US20070235030A1 (en) * 2003-08-22 2007-10-11 Teetzel James W Self-contained breathing system
US10130831B2 (en) 2003-08-22 2018-11-20 Patriot Life Support, Inc. Self-contained breathing system
US8113198B2 (en) 2003-08-22 2012-02-14 Wilcox Industries Corp. Self-contained breathing system
US7647927B2 (en) 2003-08-22 2010-01-19 Wilcox Industries Corp. Self-contained breathing system
US20100224193A1 (en) * 2003-08-22 2010-09-09 Wilcox Industries Corp. Self-contained breathing system
US8950401B2 (en) 2003-08-22 2015-02-10 Wilcox Industries Corp. Self-contained breathing system
US7513251B2 (en) * 2005-06-13 2009-04-07 Mel Blum Hand-held potassium super oxide oxygen generating apparatus
US7937775B2 (en) 2005-08-09 2011-05-10 Microtek Medical, Inc. Surgical protective head gear assembly including high volume air delivery system
US20080053447A1 (en) * 2006-08-29 2008-03-06 Ratajczak John A Adapter for air purifying filter
US20120066819A1 (en) * 2009-02-05 2012-03-22 Materiels Industriels De Securite Assembly for protecting an individual, comprising an insulation suit
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