GB2189707A - Emergency escape breathing apparatus - Google Patents
Emergency escape breathing apparatus Download PDFInfo
- Publication number
- GB2189707A GB2189707A GB08708575A GB8708575A GB2189707A GB 2189707 A GB2189707 A GB 2189707A GB 08708575 A GB08708575 A GB 08708575A GB 8708575 A GB8708575 A GB 8708575A GB 2189707 A GB2189707 A GB 2189707A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hood
- breathing
- breathing bag
- wearer
- ofthe
- Prior art date
- 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.)
- Granted
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Classifications
-
- 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
Abstract
In emergency escape breathing apparatus in which a hood 1 of a heat-resistant material envelopes the head of a wearer, there is provided a closed circuit breathing system in which the recirculating gases are kept separate from a cushion of substantially stagnant air around the head of the wearer. The breathing system comprises essentially a half mask 2 engaging the face of the wearer around the nose and mouth within the hood 1 and a breathing bag 4 carried by the hood 1 or by the half mask 2 or by both. The breathing bag 4, which is protected from hot embers by the heat resistant material of the hood 1, is fed with breathable gas, preferably oxygen, from a source 5, and provides a reservoir of breathable gas in a space separate from the general interior of the hood 1 about the head of the wearer. The breathing bag 4 and the half mask 2 are interconnected by means 7. An inhale valve 8 permits inhaled gases to pass from the breathing bag 4 to the half mask 2 and causes exhaled gases to pass through a carbon dioxide absorbent material 9. The source 5 of oxygen or other breathable gas may advantageously be located within the breathing bag 4 (Figure 2), (not shown). <IMAGE>
Description
SPECIFICATION
Emergency escape breathing apparatus
This invention relates to emergency escape breathing apparatus.
It is known to provide emergency escape breathing apparatus which comprises a flexible hood for enveloping the head of a wearer and a breathing set supplying a breathable gas, which may be air, or oxygen, or oxygen-enriched air, into the interior of the hood at a predetermined constant rate of flow for a minimum predetermined duration dependent on the size ofthe gas cylinder. The hood is of a size which can be worn over the head of a wearer ofany age or hair-style, without any adjustment and irrespective of whether the wearer is bearded or wears spectacles. A part at least ofthe hood is transparent, for example the hood may incorporate a transparent visor, orthe hood may be made of a transparent plastics material affording all round vision to the wearer.The hood has an elastic neck band past which exhaled gas leaves the hood at a rate determined by the gas flow to the hood.
This known emergency escape breathing apparatus is designed for use in escaping from a location where there may be a toxic or otherwise irrespirable atmosphere, forexample a room or corridor which is filled with smoke as a result of a fire. The user simply startstheflow of breathable gas to the hood, pulls the hood over his head, and proceeds through the irrespirable atmosphere to a place of safety.
It has further been proposed that the hood of such emergency escape breathing apparatus may include a half mask with suitable valves to control the build-up of carbon dioxide within the hood.
It is an object of the present invention to provide an improved form of this known emergency escape breathing apparatus.
According to the present invention there is provided emergency escape breathing apparatus suitable for use in escaping from the burning cabin of an aircraft and comprising a flexible hood of heat-resistant material for enveloping the head of a wearer, a half mask positioned within the hood for engaging the face of the wearer ofthe hood around the nose and mouth, a breathing bag carried bythe hood and/orthe half mask in a position suchthatthe breathing bag is protected by a portion ofthe heat-resistant material ofthe hood, a source of breathable gas carried by the breathing bag and arranged to supply breathable gas to the interior of the breathing bag to provide a reservoir of breathable gas in a space separate from the interior of the hood, a neck seal carried by one ofthe hood and the breathing bag for engaging the neck of the wearer and preventing entry of noxious fumes to the interior ofthe hood, and means interconnecting the breathing bag and the half mask for supplying breathable gas from the reservoirtothe half mask when the wearer of the emergency escape breathing apparatus inhales and for passing exhaled gases from the half maskto the breathing bag, the breathing system which comprises the interior ofthe half mask, the interconnecting means and the breathing bag being isolated from the remainder of the interior of the hood which forms a cushion of substantially stagnant air around the head of the wearer.
By isolating the breathing system from the interior of the hood around the wearer's head, so that breathing does not cause any movement of the air contacting the wearer's head, the important advantage over known closed circuit breathing apparatus is obtained that the head generally is surrounded by a cushion of stagnant air which should keep it cool even in a hot fire.
Another important improvement provided bythe present invention over the known emergency escape breathing apparatus is that, because the breathable gas is supplied from a system which is sealed from the interior ofthe hood, any accidental puncture of the hood, for example by hot embers in the atmosphere in the burning cabin of an aircraft will not immediately destroythe efficacy of the emergency escape breathing apparatus.
Furthermore, where the hood of plastics material retains its imperviousnessto a surrounding irrespirable atmosphere, the hood provides a secondary seal around the half mask. This secondary seal protects the eyes and hair of the wearer ofthe emergency escape breathing apparatus againsttoxic gases and hot or burning particles or other materials.
The secondary seal also decreases the possibility of irrespirable atmosphere affecting the breathing of the wearer in the event of the head harness provided for maintaining the half mask in position on the face of the wearer not being tight enough to provide a perfect seal between the half mask and the face ofthe wearer.
The emergency escape breathing apparatus of the present invention provides another important advantageovertheknown apparatus when the breathable gas used is oxygen or oxygen-enriched air. The confinement of the oxygen or oxygen-enriched air in a reservoir in a space separate and sealed from the interior of the hood which envelops the head of the wearer avoids the possibility of the oxygen supplied under pressure becoming trapped in the hair orthe upper part ofthe clothing ofthewearer. If oxygen were to become so trapped, there would be a possibility, when the wearertook off the hood, of a spark from a nearby fire, or the lighting of a cigarette, causing the hair or clothing of the wearer to ignite.Also, as there is no oxygen in the interior of the hood about the wearer's head, accidental puncture of the hood does not release additional oxygen into a burning atmosphere and promote further combustion.
In the emergency escape breathing apparatus of this invention, the breathing bag is protected from burning embers by a part of the heat-resistant material of the hood. The protection may be afforded by the breathing bag being located in a part of the interiorofthe hood, and generally attached a lower part of the interior of the hood orto the half mask. Although the breathing bag could be carried by the half mask alone, through the interconnecting means, it is preferred for the breathing bag to be carried essentially by the hood, in which case it is connected to the hood, for example, by heat sealing.
Alternatively the breathing bag could be secured to a bottom partofthe hood and protected byan additional flap of heat resistant material depending from the hood to cover and protect the breathing bag.
The breathing bag may be provided in any convenient form, for example it may be shaped as at least part of a ring, conveniently as a complete ring which surrounds the neck of the wearer when the hood is enveloping the head ofthe wearer. The ring-shaped breathing bag is preferably attached circumferentially, i.e. atan outer periphery ofthe ring, to a lower internal surface of the hood, but need not be so attached.
When the breathing bag is in theform of a ring attached to a lower internal surface of the hood, the inner periphery of the ring preferably carries the neck seal which is conveniently a flap of elastic polyurethane.
Preferablythe means interconnecting the breathing bag and the half mask includes carbon dioxide absorbent material through which exhaled gases pass thereby reducing the rate of build-up of carbon dioxide in the breathing bag. Conveniently a filter of carbon dioxide absorbent material is mounted within the breathing bag.
The means interconnecting the breathing bag and the half mask may be designed for pendulum breathing so that both the exhaled and the inhaled gases pass through the carbon dioxide absorbent material. In this case a regenerative or chemical heat exchanger is preferably provided for cooling the inhaled gases and preventing an unpleasant rise in the in hale temperature during use. Advantageously, however the means interconnecting the breathing bag and the half mask includes an inhale valve which enables the gas inhaled by the wearer to by-pass the carbon dioxide absorbent material sothatthe inhaled gases are cooler and drier than they are when pendulum breathing is employed.
The present invention will befurtherunderstood from the following detailed description of preferred embodiments thereof which is made, by way of example, with reference to the accompanying drawings in which Figure lisa diagrammatic representation in part-section of one embodiment of emergency escape breathing apparatus in accordance with the invention in use by the wearer.
Figure 2 is a detail of a modification ofthe breathing apparatus of Figure 1 showing the filter of carbon dioxide absorbent material mounted within the breathing bag, and Figures 3, 4and5arediagrammatic representations in part-section of further embodiments of emergency escape breathing apparatus in accordance with the invention.
Referring to Figure 1 of the accompanying drawings there is shown emergency escape breathing apparatus which includes a hood 1 of the heat resistant transparent plastics material obtainable underthe name Kapton in position on the head of a wearer. Secured to the inside of the hood 1 nearto a part of the hood 1 through which the wearer will lookwhen the hood 1 is being worn, is a simple half mask 2. The half mask 2 is designed to fit over the nose and mouth ofthe wearer and is connected to an elastic member 3 incorporated in the hood 1 and constituting a head harness for drawing the half mask 2 on to the wearer's face and retaining itthere by means of the elastic member 3 passing round the back of the wearer's head. The elastic member 3 may be either inside or outside the hood 1.
An essentially ring-shaped bag 4, the interior of which is entirely separate from the interior of the hood 1, is heat sealed to the interior of the lower edge of the hood 1,so that the ring-shaped bag is protected from puncture as a result of contact with burning embers in the atmosphere bythe heat-resistant material of the hood 1. The ring-shaped bag 4 is a breathing bag which is fed with oxygen from an oxygen cylinder 5 a predetermined rate. The bag 4 also includes a relief valve 6 permitting discharge of excess gases from the bag 4when the pressure exceeds a predetermined level.
Gases pass from the bag 4to the half mask 2 on inhalation through a bellows or other flexible connection 7 in the lower end of which are located an inhale valve 8 and an annulus 9 of carbon dioxide absorbent material such as soda lime retained within porous screens.
In operation the wearer takes the emergency escape breathing apparatus from its packaging and passes his head through the aperture in the ring-shaped breathing bag 4 and places the half mask over his nose and mouth. The supply of oxygen iseitherturned on bythe wearer before donning the hood 1 by operation of an on/offvalve on the compressed oxygen cylinder 5 or the supply of oxygen isturned on automatically as a result of either removal of the hood 1 from its packaging or the action of donning the hood.
Consequently a reservoir of breathable gas including a high percentage of oxygen, is formed in the ring-shaped breathing bag 4and on inhalation by the wearerthe inhale valve 8 opens and permits this breathable gas to pass into the half mask2. On exhalation the inhale valve 8 closes and the exhaled gases including carbon dioxide are caused to pass through the annulus 9 containing carbon dioxide absorbent material so as to reduce the rate of build-up of carbon dioxide within the breathing bag 4. As already indicated the relief valve 6 permits escape of excess gas from the ring-shaped breathing bag 4.
A neck seal 10 formed by a strip orflap of elastic polyurethane is secured to the inside edge of the ring-shaped breathing bag 4so asto engage round the neck of the wearer and provide protection against toxic gases entering the interior of the hood 1 during use of the emergency escape breathing apparatus. Acushion of substantially stagnant air is thus maintained in the interior of the hood 1 about the wearer's head.
Some escape of gas from the half mask 2 to the interior of the hood 1 aboutthewearer's head may occur if the half mask 2 is not a perfect fit. However, as this escape will occur when pressure in the half mask2 buiids up on exhalation,therewill be more carbon dioxide than oxygen in the escaping gases and the oxygen content of the gases about the wearer's head will not increase. Nor will such a slight escape as may occur significantly change the substantially stagnant state of the cushion of gases aboutthewearer's head.
The carbon dioxide absorbent material is retained in position as a filter in the annulus 9 by porous screens made of any material which will retain the dust of soda lime or other carbon dioxide absorbent material and offer low resistance to a flow of breathable gas. Examples of suitable materials are fine metal gauze, mineral wool, glass fibre filter paper and open cell plasticfoam.
Afilter of carbon dioxide absorbent material may be incorporated inside the breathing bag ratherthan in the bellows 7 connecting the breathing bag 4to the half mask 2 as illustrated in Figure 1. Such a modification of the apparatus of Figure 1 is illustrated in the detail of Figure 2. The upper edge of the filter containing the carbon dioxide absorbent material 9 is formed with flanges which are heat sealed to the material constituting the wall ofthe breathing bag 4.
Afurther modification illustrated in Figure 2 shows the oxygen cylinder positioned in'the interior ofthe breathing bag 4. Oxygen thus passes directly to the reservoir within the breathing bag 4 and any leakage from the oxygen cylinder is not loss of oxygen to the emergency escape breathing apparatus as a whole.
Another embodiment of emergency escape breathing apparatus in accordance with the present invention is illustrated in Figure 3 of the accompanying drawings. In Figure 3 there is shown a hood 11 enveloping the head of a wearer and a half mask 12 retained overthe mouth and nose ofthe wearer by means not shown. The half mask 12 is connected by flexible tubing 13 to a breathing bag 14 which is supplied with oxygen from an oxygen source 15. The breathing bag 14 hangs down belowa lowerwall 1 of the hood 11 on which part of a neck seal is carried. An extension orflap 1 1b of the heat resistant material of the hood 11 provides protection for the breathing bag 1 4from burning embers in the atmosphere.
The breathing bag 14 includes a relief valve 16 which opens to release gases when the pressure within the breathing bag exceeds a predetermined level.
Incorporated in the half mask 12 are an inhale valve 18 and a filter 19 of carbon dioxide absorbent material. In operation inhalation by the wearer causes the inhale valve 1 8to open to permitthe passage of breathable oxygen-enriched gases from the breathing bag 14to the nose and mouth ofthe wearer within the half mask 12. When the wearer exhales, gases pass through the filter 19 of carbon dioxide absorbent material to the breathing bag 14 increasing the pressure therein which is released by the opening of the relief valve 16. The breathing gases are thus isolated from the gases in the interior ofthe hood 11 above the waIl 1 lea, apartfrom minor leakage from the face mask 12, and a cushion of substantially stagnant air is retained aboutthe wearer's head.
On inhalation some gases may reach the wearer through the filter 19 of carbon dioxide absorbent material. Passage of inhale gases th rough the filter 19may be avoided by providing a half mask exhale valve 20 if desired. The valve 20 is however optional.
In the further embodiment of the present invention illustrated in Figure 4 of the accompanying drawings a breathing bag 24 extends up outside the portion of a hood 21 to which a half mask 22 is mounted. The interior of the breathing bag 24 thus directly contacts the front of the half mask 22 in which there are mounted an inhale valve 28 and a carbon dioxide absorbent filter 29. However the hood 21 is formed with an extension 21a providing protection forthe breathing bag, the construction in this respect being similartothe embodiment of Figure 3.
Asource 25 of oxygen or oxygen-enriched air is included within the breathing bag 24.
Aneckseal 30 of elastic polyurethane is affixedto the parts ofthe hood 21 whichsurroundtheneckof the wearer when the hood 21 is placed over his head.
The portion of the neck seal 30 atthefront of the hood 21 is adjacent to the inner upper edge ofthe breathing bag 24.
Instead of the inhale valve 28 and the carbon dioxide absorbentfilter 29 being mounted within the face mask 22 as illustrated in Figure4thesetwo integers could alternatively be mounted within the breathing bag 24in a manner similarto that illustrated in Figure 2.
The embodiment of Figure 4 operates in essentiallythesame manner as the embodiment of Figures 1 and 2 described above.
Referring to Figure there is shown a flexible hood 31 of a commercially available flame resistant composite formed of a suitable plastics material laminated to a woven base. Avisor 32 of a rigid transparent plastics material,forexample perspexor polycarbonate, constitutes a wrap around window heatwelded to the flexible hood 31. A speech diaphragm 33 is mounted in the visor 32 enabling the wearer of the hood 31 to communicate readily through the hood, and aflexible half mask34,for example a rubber half mask, is mountedtothe interior of the visor 32.A canister assembly 35, shown in Figure 5 in part section provides an inhalation channel and an exhalation channel interconnecting the interior of the half mask with the interior of a breathing bag 36 located within and protected by a lower front part of the flexible hood 31. Part of the breathing bag 36 is connected to an inner side of the hood 31 so that the breathing bag 36 is at least partly carried by the hood 31. An oxygen cylinder 37 is located within the breathing bag 36 so that it may discharge oxygen directly into the breathing bag 36.
In use, when the half mask34 engages the face of the wearer of the hood, the interior of the half mask 34 and the breathing bag 36 are entirely separate from the remainder of the interior of the hood 31, there being a pressure of the order of 50 to 120 mms water gauge above ambient or atmospheric pressure present in the breathing bag 36. The gases which are inhaled and exhaled by the wearer of the hood 31 are thus isolated from the gases in the remainder ofthe interior ofthe hood 31, apart from some slight leakage from the haif mask34 on exhalation. A cushion of su bsta ntia Ily stagnant air is provided aboutthe wearer's head.
The flexible hood 31 further includes aflexible polyurethane neck seal 40 and a reliefvalve 41 atthe rear ofthe hood for emitting gas if an undesired excess pressure should build up within the hood 31, due for example to a depressurisation of an aircraft cabin in which the hood 31 is being worn.
The canister assembly 35 which constitutes means interconnecting the breathing bag 36 and the half mask34, includes an inhalation means consisting of a conventional or standard inhalation valve 42 such as a rubber flap valve, and, surrounding the inhalation valve 42, an annular exhalation channel in which there is located an annular carbon dioxide absorbent filter 43 of, for example, soda lime, and, optionally,a conventional exhalation valve44.
In all embodiments ofthe invention a closed circuit breathing system is provided in which the recircuiating gases are kept separate from the remainderofthe interiorofthe hood outsidethe half mask.
In the preferred embodiments the hood contains a separate breathing bag of capcity 4-5 litres which contains the breathing gas, and the half mask, carbon dioxide absorbing canister and oxygen supply cyinder are all attached to this bag.
Emergency escape breathing apparatus as
hereinbefore described with reference to the accompanying drawings is particularly suitable for
use in emergency escape from the cabin of a civil aircraft which is subject to fire. The heat resistant
material usedforthe hood, either Kapton orthe flame resistant composite, is capable of withstanding temperatures ofthe order of 200"C, and will resist hot materials which may fall on to itduring escape from a blazing aircraft cabin.
Claims (11)
1. Emergency escape breathing apparatus suitable for use in escaping from the burning cabin of an aircraft and comprising a flexible hood of
heat-resistant material for enveloping the head of a wearer, a half mask positioned within the hood for engaging the face of the wearer of the hood around the nose and mouth, a breathing bag carried bythe
hood and/orthe half mask in a position such thatthe
breathing bag is protected by a portion ofthe heat-resistant material ofthe hood, a source of breathable gas carried by the breathing bag and arranged to supply breathable gas to the interiorof the breathing bag to provide a reservoir of breathable gas in a space separate from the interior of the hood, a neck seal carried by one ofthe hood and the breathing bag for engaging the neck ofthe wearer and preventing entry of noxious fumes to the interior of the hood, and means interconnecting the breathing bag and the half mask for supplying breathable gas from the reservoir to the half mask when the wearer ofthe emergency escape breathing apparatus inhales and for passing exhaled gases from the half maskto the breathing bag, the breathing system which comprises the interior of the half mask, the interconnecting means and the breathing bag being isolated from the remainder of the interiorofthe hood which forms a cushion of substantially stagnant air around the head of the wearer.
2. Emergency escape breathing apparatus according to Claim 1, wherein the breathing bag is secured to the interior ofthe hood of heat-resistant material.
3. Emergency escape breathing apparatus according to Claim 1 or Claim 2, wherein the source of breathable gas is carried in the interior ofthe breathing bag.
4. Emergency escape breathing apparatus according to any one ofthe preceding claims, wherein the source of breathable gas is a source of oxygen and wherein the means interconnecting the breathing bag and the half mask includes carbon dioxide absorbent material and an inhale valve which permits breathable gasto passdirectlyfrom the reservoir to the half maskduring inhalation and causes exhaled gas to take an alternative path from the half maskthrough the carbon dioxide absorbent material to the breathing bag.
5. Emergency escape breathing apparatus according to any one of Claims 1 to 3, wherein the source of breathable gas is a source of oxygen and wherein a filter of carbon dioxide absorbent material is included within the breathing bag in such manner that exhaled gases pass from the half mask to the interiorofthe breathing bag through the carbon dioxide absorbent material.
6. Emergency escape breathing apparatus according to any one ofthe preceding claims, wherein the breathing bag is in the form of a ring attached to a lower internal surface of the hood so thatthe breathing bag surrounds the neck of the wearer when the hood is enveloping the head of the wearer,andthe neckseal is carried on an inner periphery of the ring.
7. Emergency escape breathing apparatus according to any one of Claims 1 to 5, wherein the breathing bag is connected to the hood over an area ofthe hood to which the half mask is attached, and the neck seal is carried on the interior of the hood.
8. Emergency escape breathing apparatus according to any one of the preceding claims, wherein the flexible hood is of a transparent heat-resistant plastics material.
9. Emergencyescapebreathing apparatus according to any one of Claims 1 to 7, wherein the flexible hood includes a visor of transparent material.
10. Emergency escape breathing apparatus substantially as hereinbefore described with reference to any one of Figures 1 to 4 ofthe accompanying drawings.
11. Emergency escape breathing apparatus substantially as herein before described with reference to Figure 5 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08609389A GB2176779A (en) | 1985-06-24 | 1986-04-17 | Process for the preparation of anhydrous n-(3-chloro-2-hydroxypropyl)trialkylammonium salts |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8708575D0 GB8708575D0 (en) | 1987-05-13 |
| GB2189707A true GB2189707A (en) | 1987-11-04 |
| GB2189707B GB2189707B (en) | 1990-01-04 |
Family
ID=10596366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8708575A Expired - Fee Related GB2189707B (en) | 1986-04-17 | 1987-04-10 | Emergency escape breathing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2189707B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2233905A (en) * | 1989-07-19 | 1991-01-23 | Sabre Safety Ltd | Emergency escape breathing apparatus |
| FR2649897A1 (en) * | 1989-07-19 | 1991-01-25 | Sabre Safety Ltd | RESPIRATORY PROTECTION APPARATUS |
| GB2247396A (en) * | 1990-08-10 | 1992-03-04 | Sabre Safety Ltd | Emergency escape breathing apparatus |
| GB2253150A (en) * | 1991-02-28 | 1992-09-02 | Intertechnique Sa | Individual protective breathing equipment |
| GB2264647A (en) * | 1992-03-06 | 1993-09-08 | Kemira Oy | Fastening inner mask inside hood |
| AU676113B2 (en) * | 1994-05-04 | 1997-02-27 | Terence Michael O'Leary | Emergency breathing apparatus |
| US5690095A (en) * | 1995-05-24 | 1997-11-25 | Protector Technologies Limited | Emergency escape breathing apparatus |
| US7210477B2 (en) | 2002-05-29 | 2007-05-01 | Brookdale International Systems, Inc. | Respirator hood assembly |
| CN104918663A (en) * | 2012-11-30 | 2015-09-16 | Be航天公司 | Improved protective breathing apparatus inhalation duct |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9498656B2 (en) * | 2012-07-11 | 2016-11-22 | B/E Aerospace, Inc. | Aircraft crew member protective breathing apparatus |
| CN111167036A (en) * | 2020-03-11 | 2020-05-19 | 成都永信包装制品有限公司 | Protective head hood and protective suit |
-
1987
- 1987-04-10 GB GB8708575A patent/GB2189707B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2233905A (en) * | 1989-07-19 | 1991-01-23 | Sabre Safety Ltd | Emergency escape breathing apparatus |
| FR2649897A1 (en) * | 1989-07-19 | 1991-01-25 | Sabre Safety Ltd | RESPIRATORY PROTECTION APPARATUS |
| GB2247396A (en) * | 1990-08-10 | 1992-03-04 | Sabre Safety Ltd | Emergency escape breathing apparatus |
| GB2253150B (en) * | 1991-02-28 | 1995-08-16 | Intertechnique Sa | Individual protective breathing equipment |
| GB2253150A (en) * | 1991-02-28 | 1992-09-02 | Intertechnique Sa | Individual protective breathing equipment |
| GB2264647A (en) * | 1992-03-06 | 1993-09-08 | Kemira Oy | Fastening inner mask inside hood |
| DE4304891A1 (en) * | 1992-03-06 | 1993-09-09 | Kemira Oy | |
| GB2264647B (en) * | 1992-03-06 | 1995-10-25 | Kemira Oy | Respitory protective device with a hood and a filter attached to the hood |
| DE4304891C2 (en) * | 1992-03-06 | 1999-04-01 | Kemira Oy | Breathing mask with hood and attached filter |
| AU676113B2 (en) * | 1994-05-04 | 1997-02-27 | Terence Michael O'Leary | Emergency breathing apparatus |
| US5690095A (en) * | 1995-05-24 | 1997-11-25 | Protector Technologies Limited | Emergency escape breathing apparatus |
| US7210477B2 (en) | 2002-05-29 | 2007-05-01 | Brookdale International Systems, Inc. | Respirator hood assembly |
| CN104918663A (en) * | 2012-11-30 | 2015-09-16 | Be航天公司 | Improved protective breathing apparatus inhalation duct |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2189707B (en) | 1990-01-04 |
| GB8708575D0 (en) | 1987-05-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950410 |