Patent US4154796A successfully refreshed from Google Patents.
US4154796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator
Assignee: Auergesellschaft GmbH
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Filing: 1977-06-06
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Granted: 1979-05-15
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Expires: 1997-06-06
Abstract
Abstract A chemical canister for use in a respirator has opposed openings, one for connection to a mouthpiece and the other for connection to the rest of the respirator. The canister contains a carbon dioxide removing and oxygen liberating chemical, and there also is a chemical which, upon being heated, will liberate nitrogen to mix with the oxygen liberated in the canister.
Inventors
- 👤 Lothar W. Brauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:15
CPC Classifications
A; A62; A62B; A62B21/00; A62B19/00; A62B19/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A chemical unit for use in a respirator, comprising a canister having opposed openings, one of said openings being adapted to be connected to a mouthpiece for inhalation and exhalation through the canister, a body of a carbon dioxide removing and oxygen liberating chemical in the canister between said openings, and a body of a nitrogen liberating chemical inside the canister for supplying nitrogen to the canister, said last-mentioned chemical liberating the nitrogen when ignited.
Claim 2
Dependent Claim
75 words
A chemical unit for use in a respirator, comprising a canister having opposed openings, one of said openings being adapted to be connected to a mouthpiece for inhalation and exhalation through the canister, a body of a carbon dioxide removing and oxygen liberating chemical in the canister between said openings, and a body of a nitrogen liberating chemical inside the canister for supplying nitrogen to the canister, said last-mentioned chemical liberating the nitrogen when ignited.
Claim 3
Dependent Claim
42 words
A chemical unit according to claim 1, in which the relative sizes of said chemical bodies are such that the gas inhaled from the canister will contain from 21% to 90% oxygen, with the rest of the gas consisting principally of nitrogen.
Claim 4
Dependent Claim
21 words
A chemical unit according to claim 2, in which the percentage of oxygen in said gas is between 30% and 70%.
Claim 5
Dependent Claim
17 words
A chemical unit according to claim 1, in which said chemical that liberates nitrogen is ammonium nitrite.
Claim 6
Dependent Claim
17 words
A chemical unit according to claim 1, in which said chemical that liberates nitrogen is sodium azide.
Claim 7
Dependent Claim
32 words
A chemical unit according to claim 1, in which said canister is provided between said opposed openings with an opening exposing a portion of said body of nitrogen liberating chemical for ignition.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
US3931040A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |