|Publication number||US3739774 A|
|Publication date||19 Jun 1973|
|Filing date||10 May 1971|
|Priority date||21 May 1970|
|Also published as||CA937124A, CA937124A1, DE2124802A1|
|Publication number||US 3739774 A, US 3739774A, US-A-3739774, US3739774 A, US3739774A|
|Original Assignee||Ml Aviation Co Ltd|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (135), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Gregory Q 1 RESPIRATORS  Inventor: John Gregory, Marlow, England  Foreign Application Priority Data May 21, 1970 Great Britain 24,714/70 Oct. 9, 1970 Great Britain 48,184/70  US. Cl. l28/142.7, 128/142.3  Int. Cl A6211 17/04  Field of Search 128/1427, 141, 142,
 References Cited UNITED STATES PATENTS 7/1971 Parker 128/l42.5 10/1957 Reed 128/1427 4/1959 Motsinger 128/1423 7 @lll ill 1 June 19, 1973 2/1971 Bickford 128/142 12/1969 Garrison 128/1422  ABSTRACT A respirator for use in noxious atmospheres comprises a hood which completely covers the head of the wearer and the edge of which extends around his neck or shoulders and a mechanical blower is fitted to the inlet connection so as to provide more air than required for respiration to provide a positive internal pressure. The respirator may also serve as an oxygen mask for use at high altitudes by airmen and preferably includes a separate oro-nasal mask in which case the inlet has two branches, one passing to the mask by way of a nonreturn valve and the other passing to the interior of the hood also through a non-return valve. When oxygen is being supplied a valve operates to prevent the flow of air from the blower to the mask.
6 Claims, 4 Drawing Figures 3 Sheets-Sheet 2 w mmw Patented June 19, 1973 3,739,774
5 Sheets-Sheet 3 1 RESPIRATORS Respirators for use in noxious atmospheres of fumes or poisonous gases normally have a face piece which is intended to form a close seal with the face of the wearer but in practice seldom does. It is extremely difficult to form an effective seal between the edge of the face piece and the face of the wearer and there is thus always the risk that some of the surrounding atmosphere, may be drawn in between the face and the face piece instead of through the filtration canister.
According to the present invention, a respirator comprises a hood which completely covers the head of the wearer and the edge of which extends around his neck or shoulders and a mechanical blower is fitted to the inlet connectionso as to provide more air than required for respiration, so that in use some at least of the excess flows outwardly between the edge of the hood and the neck or body of the wearer. Although the edge of the hood may not make a good seal with the neck or body of the wearer, this is of no consequence in view of the excess air provided by the blower. In other words, the respirator operates at a positive pressure and the outwardly flowing excess air positively prevents any inward flow from the atmosphere. In addition, the excess air prevents the window of the respirator from becoming misted up, while the provision of a hood over the whole of the head of the wearer provides a further protection against airborne contaminants.
The respirator preferably includes a separate oronasal mask which fits closely round the mouth and nose of the wearer, in which case the inlet needs to have two branches, one passing to the mask by way of a nonreturn valve and the other passing to the interior of the hood, also through a non-return valve. Thus the air which is inhaled is exhausted from the mask through a separate outlet fitted with a non-return valve, while only the excess air which provides the positive pressure passes outwardly around the neck of the wearer.
A construction of the same general type can be adapted so that it can serve also as an oxygen mask for use at high altitudes byairmen. For this purpose a separate oxygen supply line needs to be included together with a valve which, when oxygen is being supplied, operates to prevent flow of air from the blower to the mask. When this form of the-respirator is to be used at low altitude, no oxygen is required and the respirator therefore merely functions as previously described, the incoming air being shared between the inlet to the mask and the inlet to the interior of the hood. When operating at high altitudes with the oxygen supply connected, the valve operates to close the air inlet from the blower to the mask so that all the air provided by the blower passes to the interior of the hood and then outwardly as previously described.
The valve just referred to preferably cooperates with a seating against which it is pressed to allow air to flow through it from the blower to the mask when no oxygen is being supplied, and a main spring is brought into action by the oxygen pressure when the latter is connected so as to hold the valve more firmly on its seating against the pressure of air from the blower. The inlet connection to the interior of the hood from the blower remains open under all circumstances. If, when no oxygen is being supplied, the blower fails, the wearer of the respirator can merely draw in air through the filtration canister and this air is allowed to pass freely into the mask through the valve.
When operating at high altitudes with the oxygen supply connected the oxygen pressure brings the main spring into action so that the valve is held closed against the flow of air from the blower, all of which thus passes to the interior of the hood, the oro-nasal mask being supplied with oxygen by way of a normal oxygen regulator. If, under these conditions the oxygen supply fails, the suction caused by respiration of the wearer is sufficient to open the valve even against the effects of the main spring to allow air to flow from the blower. This air will not have sufficient oxygen content for normal respiration purposes but the difficulty in breathing experienced by the wearer due to the effort necessary to open the valve against the main spring serves as a warning of the failure of the oxygen supply before anoxia sets in and thus enables him to turn on the emergency oxygen supply or to take other remedial measures.
As an alternative to the valve just described, i.e. one which has basically two separate operating conditions, it is also possible to use a valve having three separate operating positions. This valve needs to be fitted at the point where the inlet connection to the hood branches and when the respirator is used at low altitude and no oxygen is required, the valve takes up an intermediate position allowing the incoming air to be shared between the inlet to the mask and the inlet to the interior of the hood. When operating at high altitudes with the oxygen supply connected, the valve takes up a position which closes the air inlet to the mask but leaves the inlet to the interior of the hood fully open so that all the air provided by the blower passes to the interior of the hood while the inlet to the mask is connected to the oxygen supply. The third position of the valve is to allow for the possibility of the failure of the blower when the oxygen supply is not connected. If the blower fails when the oxygen is connected, the wearer can breathe oxygen in the normal way and it is only the positive pressure to the interior of the hood which fails. When the oxygen is'not connected, however, it is necessary for the wearer of the respirator to draw in air through the filtration canister, after the manner of a normal respirator, and under these circumstances the valve takes up a position in which it closes the inlet to the interior of the hood so that all the air drawn in passes directly to the mask. In this way it is possible to ensure a supply of air for breathing; even though the air for providing the positive pressure may no longer be available.
As mentioned above, the two-condition valve is preferred, in which one of the two conditions is controlled by a main spring. In order to provide the necessary selective control, the valve is conveniently a plate valve and a light spring acts between the plate of the valve and a second plate or similar member, the position of which is controlled by a piston acted on by the oxygen pressure so as to be moved closer to the first plate, thus compressing the light spring and bringing into action the main spring which also extends between the two plates and is shorter than the light spring. When the oxygen supply is no longer required the piston needs to be returned to its initial position by means of a spring and this same effect would therefore occur if there were a failure of the oxygen supply. This would prevent the main spring having the desired effect of making breathing difficult for the user in the event of oxygen failure so as to give warning of anoxia danger. To avoid this risk a spring-operated latch may be provided for holding the piston in the position to which it is moved by the oxygen pressure. When the oxygen supply is deliberately disconnected, this latch can be released manually to allow the piston to return. If the oxygen supply fails, however, the piston will remain latched in position and the necessary warning of anoxia danger will be given.
A construction of respirator in accordance with the invention will now be described in more detail, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is an external view of the respirator showing the various associated components;
FIG. 2 is a diagrammatic view partly in section showing the arangement of valves in the respirator;
FIG. 3 is a sectional view to a somewhat enlarged scale showing an alternative condition of the valve illustrated in FIG. 2; and,
FIG. 4 shows a modification of part of the valve shown in FIG. 3.
Turning first to FIG. 1, the respirator proper is indicated as 1 and is in the form of a hood which fits completely over the head of the wearer and has a flap, part of which is shown as 2 which extends over the shoulders of the wearer and also at the back and front. The respirator includes a harness, part of which is seen at 3 and this also supports a pair of filtration canisters 4 connected by lines 5 to the inlet of a mechanical blower 6. This blower is powered by an electric motor which is normally intended to be supplied via a connection 7 from the aircraft supply. As an alternative, however, a battery 8 is included which is connected to the blower 6 by a quick-release bayonet connection 9. Both the blower 6 and the battery 8 are also supported by the harness 3. The output from the blower 6 passes via a line 10 to the hood which it enters by two separate branches l1 and 12, the first passing to the interior of the hood and the second to an oro-nasal mask 13. The outlet from the mask 13 is shown as 14 but a proportion of the air supplied to the interior of the hood passes outwardly between the flap 2 and the body of the wearer and any other leakage paths which may exist so as to prevent any inward flow from the atmosphere. The remainder of the air passes outwardly through an excess pressure relief valve 15. Other parts also seen in FIG. 1 are an oxygen connection 16, a communcation connection 17 and a test connection 18.
In operation, the blower 6 normally draws air inwardly through the filtration canisters 4 and supplies the air via the line 10 to the two branches of the inlet connection 11 and 12. FIG. 2 illustrates the various valves controlling the inlet of air and oxygen to the interior of the hood 1 and also the outlet valve 14 for air or oxygen from the oro-nasal mask 13. Under normal operating conditions, the air passing along the line 10 splits between the branches 11 and 12, that passing along the branch 11 then passing through a non-return inlet valve 20 and into the interior of the hood 1 to provide positive pressure within the respirator as already described. The air passing into the branch 12 passes through a non-return valve indicated generally as 21 and then via a connection 22 to the mask 13. After res piration the air passes outwardly along a connection 23 and then through a non-return valve 24 to the outlet 14. When oxygen is supplied along the line 16, the valve 21 is effectively closed, as will be described in more detail later, so that all the air from the blower 6 passes along the branch 11 and into the interior of the hood to provide the positive pressure. The oxygen in the line 16 is under high pressure which is reduced to a value suitable for respiration by an oxygen regulator 28 from which oxygen flows to the mask 13 along the connection 22. Oxygen under pressure also flows along a branch line 29 to control the alternative action of the valve 21 as will now be described in more detail.
The valve 21 comprises a plate 30 cooperating wiJh a seating 31 and is normally controlled by a light compression spring 32 which acts between the plate 30 and a second plate 33. Under these conditions the valve acts as a normal non-return valve, thus allowing air from the blower 6 to flow freely through it as indicated by the arrows. In addition to the light compression spring 32 a stronger main spring 35 is also provided which is secured to the plate 33, but since it is shorter than the spring 32, as seen in FIG. 2, it does not normally act on the plate 30 at all and all the control is exerted by the light spring 32 as just described.
When oxygen is being supplied, however, the high pressure oxygen in the branch line 29 passes to the interior of a cylinder 37 within which works a piston 38 to which the plate 33 is secured. The piston is acted on by a tension spring 40 so that it normally occupies the position shown in FIG. 2, but the oxygen pressure applied to the interior of the cylinder 37 overcomes the spring 40 and moves the piston 38 downwardly to the position shown in FIG. 3. This also moves the plate 33 downwardly until the stronger spring 35 comes into engagement with the plate 30 and thus effectively takes over control from the light spring 32. The pressure exerted by the stronger spring 35 is greater than the pressure exerted by the air from the blower 6 so that, under these conditions, the valve 21 remains closed and all the air passes to the branch 1 1 as described previously.
The piston 38 is provided with a spring-operated latch constituted by a plunger 42 acted on by a compression spring 43 so as to enter a recess 44 in the side of the piston 38. If the oxygen supply is switched off, the plunger 42 is retracted manually by means of a ring 45 also seen in FIG. 1 which allows the piston 38 to return to the position shown in FIG. 2 so that normal operation is resumed. On the other hand, if the oxygen supply fails the piston 38 remains in the position shown in FIG. 3 so that the valve 21 is controlled by the stronger spring 35. Although the pressure developed by the blower 6 is not sufficient to overcome this stronger spring, the wearer of the respirator can nevertheless suck in air through the valve 21, although with difficulty, and the difficulty in breathing thus gives warning of anoxia danger, as previously described.
FIG. 4 shows a minor modification to part of the valve shown in FIGS. 2 and 3, intended to allow for the possibility of failure of the oxygen regulator 28. Although some of the parts are shaped differently from those shown in FIG. 3 the function is the same and corresponding parts are shown by the same reference numerals. In this construction, the position in which the plunger 42 locks the cylinder 38 is such that the end of the plunger does not reach the bottom of the recess 44, but inward movement of the plunger 42 is restricted by a spring clip 50 which engages the wall of the housing shown as 51. The plunger 42 is formed with a portion of reduced diameter constituted by a calibrated notch 52. As shown in the position of FIG. 4 this notch lies just outside the wall of the cylinder 37 but if the plunger 42 is pressed inwardly to the bottom of the recess 44, thus overcoming the effect of the spring clip 50, the notch 52 is brought opposite the opening in the wall of the cylinder 37. This permits a controlled flow of high pressure oxygen from the interior of the cylinder 37 to the entrance to the connection 22 and hence to the mask 13. The flow of oxygen is throttled by the narrow gap between the notch 52 and the opening in the cylinder wall and this has an effect equivalent to that of the oxygen regulator in reducing the pressure of the oxygen to a value suitable for respiration.
By means of the construction just described all the various possible operating conditions can be allowed for. When no oxygen is required, the blower 6 provides air both forrespiration and for providing positive pressure. If the blower fails under these conditions, the wearer of the respirator can merely draw in air through the filtration canisters 4, but no positive pressure is provided. When oxygen is being used the air provided by the blower 6 flows solely to the interior of the hood to provide the positive pressure. If, under these conditions, the blower fails, this merely means that no positive pressure is provided and the wearer merely inhales oxygen in the normal way. Failure of the oxygen supply leads to the difficult breathing conditions previously described and indicates to the wearer that the emergency supply must be connected. Finally, failure of the oxygen regulator can be remedied by operation of the valve shown in FIG. 4 as just described.
l. A respirator comprising a hood which is dimensioned to completely cover the head of the wearer and has a terminal lower edge dimensioned to encircle the body of the wearer beneath his head to define a narrow passageway between said edge and said body,
an oro-nasal mask within said hood,
an inlet for admitting air to said hood, said inlet having two branches, one leading into said mask through a first non-return valve, and the other leading into the interior of said hood outside said mask through a second non-return valve,
a mechanical blower connected to supply air to said inlet, whereby a portion thereof passes through said second non-return valve into said hood outside said mask and thence outwardly through the passage bwtewwn the edge of the hood and the body of the wearer,
a connector for connecting said mask to a supply of oxygen, and means for preventing the flow of air from said blower to said mask while said oxygen is being supplied.
2. A respirator as claimed in claim 1 in which said first non-return valve comprises a valve-member and a seat and said flow-preventing means comprises means urging said valve member against said seat with a force small enough to permit air to flow through said first non-return valve from said blower to said mask when no oxygen is being supplied, a main spring for urging said valve member more strongly toward said seat, and means for bringing said main spring into action under the control of the oxygen pressure when said oxygen is being supplied so as to hold said valve member more firmly on said seat against the pressure of air form said blower.
3. A respirator as claimed in claim 1 in which said first non-return valve is a plate valve comprising first and second plates, a seat, a light spring positioned between said first and second plates to press said first plate against said seat, a cylinder containing a piston responsive to the oxygen pressure when oxygen is being supplied to move said second plate closer to said first plate, thus compressing said light spring, and a main spring between said plates which is shorter than said light spring and urged against said first plate by said second plate when said piston is subjected to said oxygen pressure.
4. A respirator as claimed in claim 3 comprising a spring-operated latch for holding said piston in the position to which it is moved by said oxygen pressure.
5. A respirator as claimed in claim 4 in which said latch is a spring-operated plunger passing through a sealed opening in said cylinder and being formed with a portion of reduced diameter which when brought into register with said opening, permits a throttled flow of oxygen from the interior of said cylinder to said mask.
6. A respirator as claimed in claim 1 comprising an air exhaust duct leading from said mask to the exterior of said hood.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2810386 *||7 Nov 1952||22 Oct 1957||American Optical Corp||Oxygen masks embodying means for ventilating goggles|
|US2881758 *||13 Jun 1956||14 Apr 1959||Motsinger Armard V||Ventilated impermeable protective outfit|
|US3481333 *||31 Mar 1966||2 Dec 1969||Automatic Sprinkler Corp||Inhalation-exhalation regulator system with suction control|
|US3565068 *||7 Feb 1969||23 Feb 1971||Automatic Sprinkler Corp||Breathing apparatus|
|US3595227 *||7 Mar 1969||27 Jul 1971||Gen Electric||Diving vest|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3976063 *||16 Sep 1974||24 Aug 1976||The Bendix Corporation||Escape breathing apparatus|
|US4127122 *||25 Mar 1977||28 Nov 1978||Gesellschaft Fur Kernforschung Gmbh||Breathing apparatus|
|US4352353 *||31 Jan 1980||5 Oct 1982||The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland||Protective clothing|
|US4608976 *||10 Sep 1984||2 Sep 1986||Canocean Resources, Ltd.||Breathing protective apparatus with inhalation and exhalation regulator|
|US4674492 *||25 Jul 1986||23 Jun 1987||Filcon Corporation||Alarm system for respirator apparatus and method of use|
|US4676236 *||23 Dec 1985||30 Jun 1987||Gentex Corporation||Helmet airflow system|
|US5078130 *||14 Jul 1988||7 Jan 1992||Gentex Corporation||Personnel headgear enabling free breathing of ambient air or selective breathing from various sources|
|US5186165 *||5 Jun 1991||16 Feb 1993||Brookdale International Systems Inc.||Filtering canister with deployable hood and mouthpiece|
|US5315987 *||2 Dec 1992||31 May 1994||Brookdale International Systems Inc.||Filtering canister with deployable hood and mouthpiece|
|US5394867 *||2 Aug 1993||7 Mar 1995||Brookdale International Systems Inc.||Personal disposable emergency breathing system with dual air supply|
|US6478026||13 Mar 2000||12 Nov 2002||Thomas J. Wood||Nasal ventilation interface|
|US6994089||15 Sep 2004||7 Feb 2006||Innomed Technologies, Inc||Nasal ventilation interface|
|US6997177||13 Jul 2004||14 Feb 2006||Inno Med Technologies, Inc.||Ventilation interface for sleep apnea therapy|
|US7000613||28 Jun 2004||21 Feb 2006||Innomed Technologies, Inc.||Nasal interface and system including ventilation insert|
|US7047974||20 Oct 2003||23 May 2006||Innomed Technologies, Inc.||Nasal cannula|
|US7059328||17 Dec 2004||13 Jun 2006||Innomed Technologies, Inc.||Ventilation interface for sleep apnea therapy|
|US7188624||15 Sep 2004||13 Mar 2007||Innomed Technologies Inc.||Ventilation interface for sleep apnea therapy|
|US7191781||9 Dec 2004||20 Mar 2007||Innomed Technologies, Inc.||Nasal ventilation interface and system|
|US7234465||10 Dec 2004||26 Jun 2007||Innomed Technologies, Inc.||Nasal ventilation interface and system|
|US7380551||3 Sep 2004||3 Jun 2008||Tvi Corporation||Breathing apparatus|
|US7472707||1 Jul 2004||6 Jan 2009||Innomed Technologies, Inc.||Nasal interface and system including ventilation insert|
|US7543584||29 Sep 2003||9 Jun 2009||Interspiro, Inc.||Powered air purifying respirator system and breathing apparatus|
|US7559327||31 May 2005||14 Jul 2009||Respcare, Inc.||Ventilation interface|
|US7647927||23 Aug 2004||19 Jan 2010||Wilcox Industries Corp.||Self-contained breathing system|
|US7658189||26 Jun 2006||9 Feb 2010||Resmed Limited||Compact oronasal patient interface|
|US7708017||7 Feb 2007||4 May 2010||Resmed Limited||Compact oronasal patient interface|
|US7942148||24 Dec 2004||17 May 2011||Resmed Limited||Compact oronasal patient interface|
|US7958893||18 Mar 2009||14 Jun 2011||Resmed Limited||Cushion for a respiratory mask assembly|
|US8042539||6 Jul 2005||25 Oct 2011||Respcare, Inc.||Hybrid ventilation mask with nasal interface and method for configuring such a mask|
|US8113198||15 Jan 2010||14 Feb 2012||Wilcox Industries Corp.||Self-contained breathing system|
|US8136525||6 Jun 2006||20 Mar 2012||Resmed Limited||Mask system|
|US8261745||12 Dec 2005||11 Sep 2012||Respcare, Inc.||Ventilation interface|
|US8291906||4 Jun 2009||23 Oct 2012||Resmed Limited||Patient interface systems|
|US8297285||27 Jul 2007||30 Oct 2012||Resmed Limited||Delivery of respiratory therapy|
|US8479727 *||4 May 2004||9 Jul 2013||The United States Of America As Represented By The Secretary Of The Army||Enhanced chemical/biological respiratory protection system|
|US8485192||29 Jun 2012||16 Jul 2013||Resmed Limited||Cushion for patient interface|
|US8517023||29 Jan 2008||27 Aug 2013||Resmed Limited||Mask system with interchangeable headgear connectors|
|US8522784||23 Jan 2013||3 Sep 2013||Resmed Limited||Mask system|
|US8528561||18 Jan 2013||10 Sep 2013||Resmed Limited||Mask system|
|US8550081||29 Nov 2012||8 Oct 2013||Resmed Limited||Cushion for patient interface|
|US8550082||29 Nov 2012||8 Oct 2013||Resmed Limited||Cushion for patient interface|
|US8550083||29 Nov 2012||8 Oct 2013||Resmed Limited||Cushion for patient interface|
|US8550084||27 Feb 2009||8 Oct 2013||Resmed Limited||Mask system|
|US8555885||29 Nov 2012||15 Oct 2013||Resmed Limited||Cushion for patient interface|
|US8567404||14 Nov 2012||29 Oct 2013||Resmed Limited||Cushion for patient interface|
|US8573213||14 Nov 2012||5 Nov 2013||Resmed Limited||Cushion for patient interface|
|US8573214||28 Nov 2012||5 Nov 2013||Resmed Limited||Cushion for patient interface|
|US8573215||29 Nov 2012||5 Nov 2013||Resmed Limited||Cushion for patient interface|
|US8578935||29 Nov 2012||12 Nov 2013||Resmed Limited||Cushion for patient interface|
|US8613280||14 Nov 2012||24 Dec 2013||Resmed Limited||Cushion for patient interface|
|US8613281||29 Nov 2012||24 Dec 2013||Resmed Limited||Cushion for patient interface|
|US8616211||29 Nov 2012||31 Dec 2013||Resmed Limited||Cushion for patient interface|
|US8733358||17 May 2011||27 May 2014||Resmed Limited||Cushion for a respiratory mask assembly|
|US8789532||10 Mar 2006||29 Jul 2014||Respcare, Inc.||Ventilation mask|
|US8807135||3 Jun 2005||19 Aug 2014||Resmed Limited||Cushion for a patient interface|
|US8869797||18 Apr 2008||28 Oct 2014||Resmed Limited||Cushion and cushion to frame assembly mechanism for patient interface|
|US8869798||3 Sep 2009||28 Oct 2014||Resmed Limited||Foam-based interfacing structure method and apparatus|
|US8887725||10 May 2006||18 Nov 2014||Respcare, Inc.||Ventilation interface|
|US8905031||14 Feb 2012||9 Dec 2014||Resmed Limited||Patient interface systems|
|US8915251||17 Feb 2012||23 Dec 2014||Resmed Limited||Mask system|
|US8936022||21 Mar 2008||20 Jan 2015||3M Innovative Properties Company||Air delivery apparatus for respirator hood|
|US8944061||15 Mar 2013||3 Feb 2015||Resmed Limited||Cushion to frame assembly mechanism|
|US8950401 *||13 Feb 2012||10 Feb 2015||Wilcox Industries Corp.||Self-contained breathing system|
|US8960196||29 May 2013||24 Feb 2015||Resmed Limited||Mask system with interchangeable headgear connectors|
|US9027556||23 Jan 2013||12 May 2015||Resmed Limited||Mask system|
|US9032955||6 Jun 2006||19 May 2015||Resmed Limited||Mask system|
|US9067033||9 May 2011||30 Jun 2015||Resmed Limited||Compact oronasal patient interface|
|US9119931||31 Jul 2014||1 Sep 2015||Resmed Limited||Mask system|
|US9138553||12 Jun 2012||22 Sep 2015||Innomed Technologies, Inc.||Ventilation interface for sleep apnea therapy|
|US9149594||14 Sep 2012||6 Oct 2015||Resmed Limited||Patient interface systems|
|US9162034||27 Jul 2007||20 Oct 2015||Resmed Limited||Delivery of respiratory therapy|
|US9162088||21 Nov 2012||20 Oct 2015||Honeywell International Inc.||Method of assembly and disassembly of abrasive blast respirator|
|US9192793 *||21 Nov 2012||24 Nov 2015||Honeywell International Inc.||Abrasive blast respirator|
|US9192794 *||21 Nov 2012||24 Nov 2015||Honeywell International Inc.||Noise reduction system for supplied air respirator|
|US9192796||21 Nov 2012||24 Nov 2015||Honeywell International Inc.||Method of donning and testing abrasive blast respirator|
|US9220860||5 Feb 2010||29 Dec 2015||Resmed Limited||Compact oronasal patient interface|
|US9238116||18 Aug 2014||19 Jan 2016||Redmed Limited||Cushion for a patient interface|
|US9295800||20 Dec 2013||29 Mar 2016||Resmed Limited||Cushion for patient interface|
|US9381316||30 Jan 2009||5 Jul 2016||Resmed Limited||Interchangeable mask assembly|
|US9480809||29 Jul 2008||1 Nov 2016||Resmed Limited||Patient interface|
|US9724488||11 Apr 2014||8 Aug 2017||Resmed Limited||Cushion for a respiratory mask assembly|
|US9757533||12 Aug 2013||12 Sep 2017||Resmed Limited||Mask system with snap-fit shroud|
|US9770568||23 Feb 2017||26 Sep 2017||Resmed Limited||Mask system with snap-fit shroud|
|US20040134498 *||20 Oct 2003||15 Jul 2004||Roger Strickland||Nasal cannula|
|US20040182394 *||21 Mar 2003||23 Sep 2004||Alvey Jeffrey Arthur||Powered air purifying respirator system and self contained breathing apparatus|
|US20040182395 *||29 Sep 2003||23 Sep 2004||Brookman Michael J.||Powered air purifying respirator system and breathing apparatus|
|US20040182397 *||21 Mar 2003||23 Sep 2004||Innomed Technologies, Inc.||Nasal interface including ventilation insert|
|US20050022817 *||3 Sep 2004||3 Feb 2005||Tvi Corporation||Breathing apparatus|
|US20050028821 *||1 Jul 2004||10 Feb 2005||Wood Thomas J.||Nasal interface and system including ventilation insert|
|US20050028823 *||15 Sep 2004||10 Feb 2005||Wood Thomas J.||Nasal ventilation interface|
|US20050034730 *||15 Sep 2004||17 Feb 2005||Wood Thomas J.||Ventilation interface for sleep apnea therapy|
|US20050039757 *||13 Jul 2004||24 Feb 2005||Wood Thomas J.||Ventilation interface for sleep apnea therapy|
|US20050045182 *||28 Jun 2004||3 Mar 2005||Wood Thomas J.||Nasal interface and system including ventilation insert|
|US20050109341 *||2 Apr 2004||26 May 2005||Alvey Jeffrey A.||Powered air purifying respirator system and self contained breathing apparatus|
|US20050126574 *||17 Dec 2004||16 Jun 2005||Wood Thomas J.||Ventilation interface for sleep apnea therapy|
|US20050133040 *||10 Dec 2004||23 Jun 2005||Wood Thomas J.||Nasal interface and system including ventilation insert|
|US20050235999 *||4 Aug 2004||27 Oct 2005||Wood Thomas J||Nasal ventilation interface and system|
|US20050236000 *||10 Dec 2004||27 Oct 2005||Wood Thomas J||Nasal ventilation interface and system|
|US20050247310 *||4 May 2004||10 Nov 2005||Grove Corey M||Enhanced chemical/biological respiratory protection system|
|US20060048777 *||21 Jul 2005||9 Mar 2006||Interspiro, Inc.||Apparatus and method for providing breathable air and bodily protection in a contaminated environment|
|US20060124131 *||6 Jul 2005||15 Jun 2006||Respcare, Inc.||Hybrid ventilation mask with nasal interface and method for configuring such a mask|
|US20060150982 *||23 Apr 2004||13 Jul 2006||Wood Thomas J||Nasal ventilation interface and system|
|US20060191533 *||8 Sep 2005||31 Aug 2006||Interspiro, Inc.||Powered air purifying respirator system and breathing apparatus|
|US20060237017 *||26 Jun 2006||26 Oct 2006||Resmed Limited||Compact oronasal patient interface|
|US20060266361 *||31 May 2005||30 Nov 2006||Shara Hernandez||Ventilation interface|
|US20070144525 *||24 Dec 2004||28 Jun 2007||Resmed Limited||Compact oronasal patient interface|
|US20070186930 *||7 Feb 2007||16 Aug 2007||Resmed Limited||Compact oronasal patient interface|
|US20070221226 *||10 Mar 2006||27 Sep 2007||Norman Hansen||Ventilation mask|
|US20070235030 *||23 Aug 2004||11 Oct 2007||Teetzel James W||Self-contained breathing system|
|US20070272249 *||10 May 2006||29 Nov 2007||Sanjay Chandran||Ventilation interface|
|US20080129063 *||30 Nov 2007||5 Jun 2008||Samsung Electronics Co., Ltd.||Vacuum type pickup apparatus and vacuum type pickup Method|
|US20090277452 *||6 Jun 2006||12 Nov 2009||Steven John Lubke||Mask System|
|US20100037891 *||21 Mar 2008||18 Feb 2010||Walker Garry J||Air delivery apparatus for respirator hood|
|US20100132717 *||5 Feb 2010||3 Jun 2010||Resmed Limited||Compact oronasal patient interface|
|US20100215203 *||30 Jun 2009||26 Aug 2010||Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd.||Speaker and wireless charging system using same|
|US20100224193 *||15 Jan 2010||9 Sep 2010||Wilcox Industries Corp.||Self-contained breathing system|
|US20100224194 *||3 Sep 2008||9 Sep 2010||Walker Garry J||Respirator Flow Control Apparatus and Method|
|US20100294270 *||8 Oct 2008||25 Nov 2010||Curran Desmond T||Respirator Assembly with Air Flow Direction Control|
|US20120138059 *||13 Feb 2012||7 Jun 2012||Wilcox Industries Corp.||Self-contained breathing system|
|US20140116429 *||21 Nov 2012||1 May 2014||Honeywell International Inc.||Abrasive blast respirator|
|US20140116445 *||21 Nov 2012||1 May 2014||Honeywell International Inc.||Noise reduction system for supplied air respirator|
|US20150083134 *||1 Dec 2014||26 Mar 2015||3M Innovative Properties Company||Respirator Flow Control Apparatus And Method|
|USD623288||28 Apr 2006||7 Sep 2010||Resmed Limited||Patient interface|
|USD645557||22 Feb 2007||20 Sep 2011||Resmed Limited||Paired set of prongs for patient interface|
|USD652909||28 Jan 2009||24 Jan 2012||Resmed Limited||Respiratory mask frame|
|USD659237||6 Apr 2010||8 May 2012||Resmed Limited||Patient interface|
|USD669576||19 Dec 2011||23 Oct 2012||Resmed Limited||Respiratory mask frame|
|USD703312||16 Apr 2012||22 Apr 2014||Resmed Limited||Patient interface|
|USD757927||26 Feb 2014||31 May 2016||Resmed Limited||Frame for patient interface|
|CN1802188B||25 Feb 2004||8 Dec 2010||英特斯普罗公司||Powered air purifying respirator system and breathing apparatus|
|CN104918663A *||26 Nov 2013||16 Sep 2015||Be 航天公司||Improved protective breathing apparatus inhalation duct|
|EP2129443A1 *||21 Mar 2008||9 Dec 2009||3M Innovative Properties Company||Respirator flow control apparatus and method|
|EP2129443A4 *||21 Mar 2008||1 Apr 2015||3M Innovative Properties Co||Respirator flow control apparatus and method|
|WO2004093997A1 *||25 Feb 2004||4 Nov 2004||Interspiro Ab||Powered air purifying respirator system and breathing apparatus|
|WO2016090161A1 *||3 Dec 2015||9 Jun 2016||The University Of Utah Research Foundation||Medical gas delivery device|
|International Classification||A62B18/00, A62B18/04, A62B7/00|
|Cooperative Classification||A62B18/04, A62B7/00|
|European Classification||A62B18/04, A62B7/00|