Patent US3794030A successfully refreshed from Google Patents.
US3794030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency breathing apparatus
Assignee: MSA Safety Inc
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Filing: 1971-11-05
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Granted: 1974-02-26
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Expires: 1991-11-05
Abstract
Abstract In emergency breathing apparatus a case has a back section and a removable front cover section that are normally held together. Inside the case an airregenerating canister is secured to the back section and has a port in one end, to which a flexible breathing hose is connected. The opposite end of the canister is provided with an opening in each side, each of which is connected with an opening in one end of a breathing bag extending along that side of the canister. The hose and bags normally are folded within the case. The other ends of the bags are connected by means formed to extend around the back of the neck of a user of the apparatus to suspend the bags over his chest when they are removed from the case, with the canister between the bags.
Inventors
- 👤 H Cotabish
- 👤 L Wise
- 👤 E Buban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:49
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
Emergency breathing apparatus comprising a vertically elongated case having a back section and a removable front cover section, means normally holding said sections together to keep the case closed, an air purifying and oxygen producing rectangular canister inside the case and secured to its back section, the canister having an inlet-outlet port in its upper end, a flexible breathing hose connected to said port, the lower end portion of the canister being provided with an opening in each side, a breathing bag extending along each side of the canister and provided at its lower end with an inlet-outlet opening, attaching means connecting each bag opening with the adjacent one of said canister openings and thereby attaching the bags to the canister to support it, the hose and bags normally being folded within the case, and means connecting the upper ends of said bags and formed to extend around the back of the neck of a user of the apparatus to suspend the bags over his chest when they are removed from the case, whereby the bags and said attaching means will support the canister upright between the bags and it will support said back section of the opened case upright against the chest.
Claim 2
Dependent Claim
203 words
Emergency breathing apparatus comprising a vertically elongated case having a back section and a removable front cover section, means normally holding said sections together to keep the case closed, an air purifying and oxygen producing rectangular canister inside the case and secured to its back section, the canister having an inlet-outlet port in its upper end, a flexible breathing hose connected to said port, the lower end portion of the canister being provided with an opening in each side, a breathing bag extending along each side of the canister and provided at its lower end with an inlet-outlet opening, attaching means connecting each bag opening with the adjacent one of said canister openings and thereby attaching the bags to the canister to support it, the hose and bags normally being folded within the case, and means connecting the upper ends of said bags and formed to extend around the back of the neck of a user of the apparatus to suspend the bags over his chest when they are removed from the case, whereby the bags and said attaching means will support the canister upright between the bags and it will support said back section of the opened case upright against the chest.
Claim 3
Dependent Claim
156 words
Emergency breathing apparatus according to claim 1, in which said canister includes a housing having front and back walls connected by side walls and end walls, a transverse partition in the housing extending from side to side thereof adjacent said canister openings but between them and said port, the partition extending rearwardly from said front wall to form a short chamber between said openings that is defined by said front and back and side walls and the nearest end wall, a long chamber being formed by the rest of the housing between the partition and said port, the canister housing being provided at the back with a passage past said partition for connecting said chambers, an air purifying and oxygen producing chemical bed in said long chamber between said passage and port, an oxygen candle in said short chamber, and manually operable means outside of said housing for igniting the candle when the case is open.
Claim 4
Dependent Claim
19 words
Emergency breathing apparatus according to claim 2, including molecular sieves between said chemical bed and said port and passage.
Claim 5
Dependent Claim
124 words
Emergency breathing apparatus according to claim 2, in which said inlet and outlet port is adjacent the front wall of the housing, a perforated plate in said long chamber engages said partition and is inclined backwardly therefrom to a point behind said port, the plate Having means spacing it from the front wall, a filter mat engages the back of the plate, a first screen engages the back of the mat, a second screen is spaced behind the first screen with said chemical bed between them, a filter mat is behind the second screen, an inclined perforated plate engages said partition behind the second mat, and a spring between the back plate and the back wall of the housing presses the back plate forward.
Claim 6
Dependent Claim
16 words
Emergency breathing apparatus according to claim 4, including molecular sieves between said chemical bed and screens.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |