US3893459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency breathing apparatus
Assignee: MSA Safety Inc
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Filing: 1974-03-04
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Granted: 1975-07-08
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Expires: 1994-03-04
Abstract
Abstract A mask is provided with a breathing opening, directly in front of the outer end of which there is a chemical cartridge that is secured to the mask. The cartridge has an exhalation passage extending through it from front to back, with its rear end registering with the breathing opening. A check valve in the inhalation passage allows air flow only into the mask. In the exhalation passage there is a carbon dioxide removing and oxygen generating chemical. A breathing bag is supported by the mask or the cartridge and communicates with the front end of the exhalation passage. Either the mask or the cartridge is provided with an inhalation check valve allowing air being inhaled from the bag to bypass the chemical.
Inventors
- 👤 John W Mausteller
- 👤 Miles J Mcgoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:03
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/08; F; F16; F16L; F16L19/00; F16L19/02; F16L19/0212; F16L19/0218
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
Emergency breathing apparatus comprising a mask member having an open inner side, a closed outer side and provided with a breathing opening in said outer side, a chemical cartridge member secured to the mask member, the cartridge member having an exhalation passage extending therethrough registering with said breathing opening, a carbon dioxide removing and oxygen generating chemical in said exhalation passAge, a breathing bag provided with an opening receiving said mask member with said cartridge member inside the bag, said bag being sealed against the mask member about the periphery of said opening whereby the mask member supports the bag, one of said members being provided with an inhalation passage by-passing said chemical for connecting the inside of the bag with the inside of the mask member, and an inhalation check valve in said inhalation passage preventing exhalation through that passage.
Claim 2
Dependent Claim
141 words
Emergency breathing apparatus comprising a mask member having an open inner side, a closed outer side and provided with a breathing opening in said outer side, a chemical cartridge member secured to the mask member, the cartridge member having an exhalation passage extending therethrough registering with said breathing opening, a carbon dioxide removing and oxygen generating chemical in said exhalation passAge, a breathing bag provided with an opening receiving said mask member with said cartridge member inside the bag, said bag being sealed against the mask member about the periphery of said opening whereby the mask member supports the bag, one of said members being provided with an inhalation passage by-passing said chemical for connecting the inside of the bag with the inside of the mask member, and an inhalation check valve in said inhalation passage preventing exhalation through that passage.
Claim 3
Dependent Claim
22 words
Emergency breathing apparatus according to claim 1, in which said mask member is provided inside the bag with said inhalation check valve.
Claim 4
Dependent Claim
19 words
Emergency breathing apparatus according to claim 1, in which said cartridge member is provided with said inhalation check valve.
Claim 5
Dependent Claim
120 words
Emergency breathing apparatus according to claim 3, in which said cartridge includes a first wall adjacent said outer side of said mask member, a second perforated wall in parallel relationship to said first wall and a perforated partition wall extending across said exhalation passage between said first and second wall and spaced from said first and second wall, said chemical is packed in the space between said perforated walls, said inhalation passage includes an inlet opening in said first wall of the cartridge member connecting the inside of the bag with the space behind said partition wall, and said check valve is disposed in said space and is mounted on said first wall for closing said inlet opening during exhalation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |