Patent US3929127A successfully refreshed from Google Patents.
US3929127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diver{3 s breathing apparatus with gas purifying system
Assignee: Individual
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Filing: 1974-06-25
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Granted: 1975-12-30
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Expires: 1994-06-25
Abstract
Abstract A diver''s breathing apparatus comprises a mouthpiece, a canister of carbon dioxide absorbing medium, two tubes linking the mouthpiece and the canister, one permitting flow of exhaled gas to the canister and the other permitting flow of purified gas to the mouthpiece. Two more tubes extend between the canister and an inflatable bag. One allows gas to flow into the bag and the other allows gas to flow back to the canister. The apparatus further comprises a high pressure oxygen cylinder to maintain a sufficient oxygen concentration in the system. Non-return valves in said tubes ensure that virtually all exhaled gas passes twice through the canister before being rebreathed.
Inventors
- 👤 Terence Barrington Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:40
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/10; B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A breathing apparatus comprising a first and a second gas conduit loop, a gas purifier chamber which forms a common portion of the two gas conduit loops over part of their length, a gas purifying substance contained within said chamber, means for permitting only uni-directional flow of gas through each of said loops and the gas purifier chamber, a mouthpiece orifice located in the first of said loops, a gas tight inflatable bag forming part of the second of said loops and means for admitting make-up gas to the apparatus whereby the gases flowing into the mouthpiece orifice flow through the gas purifying substance twice in the same direction before being returned to the mouthpiece orifice.
Claim 2
Dependent Claim
116 words
A breathing apparatus comprising a first and a second gas conduit loop, a gas purifier chamber which forms a common portion of the two gas conduit loops over part of their length, a gas purifying substance contained within said chamber, means for permitting only uni-directional flow of gas through each of said loops and the gas purifier chamber, a mouthpiece orifice located in the first of said loops, a gas tight inflatable bag forming part of the second of said loops and means for admitting make-up gas to the apparatus whereby the gases flowing into the mouthpiece orifice flow through the gas purifying substance twice in the same direction before being returned to the mouthpiece orifice.
Claim 3
Dependent Claim
23 words
A breathing apparatus as claimed in claim 1 wherein said gas purifier chamber is a canister having at least one removable end cap.
Claim 4
Dependent Claim
28 words
A breathing apparatus as claimed in claim 2 wherein the canister contains two end caps each of which contains two ports for communication with the gas conduit loops.
Claim 5
Dependent Claim
24 words
A breathing apparatus as claimed in claim 3 wherein each of the two ports in either end cap communicates with a different conduit loop.
Claim 6
Dependent Claim
24 words
A breathing apparatus as claimed in claim 3 wherein the two ports of each end cap communicate with one and the same conduit loop.
Claim 7
Dependent Claim
25 words
A breathing apparatus as claimed in claim 3 wherein both conduit loops communicate with the canister by means of ports in one end cap only.
Claim 8
Dependent Claim
45 words
A breathing apparatus as claimed in claim 6 wherein said end cap contains four ports, two of which pass directly into the canister while the remaining two communicate with a duct opening into the canister at a point adjacent the far end of the canister.
Claim 9
Dependent Claim
92 words
A breathing apparatus as claimed in claim 1 wherein said means for permitting only uni-directional flow of gas through said loops and gas purifier chamber comprises one pair of check valves located in the first loop on either side of the mouthpiece orifice and a second pair of check valves located in the second loop on either side of the gas tight inflatable bag with said pairs of check valves oriented to cause the uni-directional flow of gases in each loop to flow in the same directions through the gas purifier chamber.
Claim 10
Dependent Claim
34 words
A breathing apparatus as claimed in claim 1 in which the means for admitting make-up gas to the apparatus comprises a high pressure gas reservoir communicating with the apparatus through a pressure reducing valve.
Claim 11
Dependent Claim
25 words
A breathing apparatus as claimed in claim 9 in which the make-up gas enters the apparatus at an upstream end of the gas purifier chamber.
Claim 12
Dependent Claim
22 words
A breathing apparatus according to claim 1 in which the gas tight inflatable bag is provided with an adjustable pressure relief valve.
References Cited (Backward Citations)
US2586670A
Cited
US3707965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |