US3575167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multipurpose breathing apparatus
Assignee: Individual
•
Filing: 1968-06-06
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Granted: 1971-04-20
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Expires: 1988-06-06
Abstract
Abstract A versatile closed-circuit breathing apparatus has a rectangular canister which is partitioned to provide for two separated volumes of CO2 absorbent. A mouthpiece, tubing and nonreturn valves, including a demand valve on the inhalation side, define a breath flow circuit in which exhalation passes through one volume of CO2 absorbent then through an expansible breathing bag and which is also a moisture trap and then back to the mouthpiece through the other volume of absorbent. Loss of effectiveness from moisture channelization is initially confined largely to one-half of the total volume of absorbent thereby providing for more uniform effectiveness over a long period of use. The construction is readily adaptable to a variety of uses including protection from contaminated atmospheres of various kinds, diving, resuscitation, decompression and medical uses.
Inventors
- 👤 Charles E Michielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:37
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A breathing apparatus comprising: an element engageable with a user''s mouth; a partitioned canister having first and second chambers therein and having a pair of openings each communicating with a separate one of said chambers; means for retaining a separate charge of carbon dioxide absorbent material in each of said chambers; an exhalation nonreturn valve providing a one-way gas flow passage from said mouth-engaging element to said first chamber of said canister; an inhalation nonreturn valve normally defining a one-way gas flow passage from the second chamber of said canister to said mouth-engaging element; and an expansible breathing bag fitted onto the region of said canister having said pair of openings to form a gas flow passage from said first chamber of said canister to said second chamber thereof, a disengageable cover for said canister providing for access to said charges of absorbent material, and a layer of resilient material situated between said cover and said absorbent material of both of said chambers and compressed by engagement of said cover on said canister to maintain said absorbent material in a packed condition as shrinkage occurs.
Claim 2
Dependent Claim
185 words
A breathing apparatus comprising: an element engageable with a user''s mouth; a partitioned canister having first and second chambers therein and having a pair of openings each communicating with a separate one of said chambers; means for retaining a separate charge of carbon dioxide absorbent material in each of said chambers; an exhalation nonreturn valve providing a one-way gas flow passage from said mouth-engaging element to said first chamber of said canister; an inhalation nonreturn valve normally defining a one-way gas flow passage from the second chamber of said canister to said mouth-engaging element; and an expansible breathing bag fitted onto the region of said canister having said pair of openings to form a gas flow passage from said first chamber of said canister to said second chamber thereof, a disengageable cover for said canister providing for access to said charges of absorbent material, and a layer of resilient material situated between said cover and said absorbent material of both of said chambers and compressed by engagement of said cover on said canister to maintain said absorbent material in a packed condition as shrinkage occurs.
Claim 3
Dependent Claim
195 words
A breathing apparatus comprising: an element engageable with a user''s mouth; a partitioned canister having first and second chambers therein, wherein said canister is of a substantially rectangular configuration and has a central partition parallel to the two sidewalls thereof to define said two chambers therein; means for retaining a separate charge of carbon dioxide absorbent material in each of said chambers; wherein said means for retaining said charges of absorbent material in said chambers comprise a pair of spaced-apart gas-pervious screens extending between opposite ends of the associated chamber in an oblique relationship to said center partition whereby tapered plenum regions are defined at opposite sides of each of said charges of material in each of said chambers, an exhalation nonreturn valve providing a one-way gas flow passage from said mouth-engaging element to said first chamber of said canister; an inhalation nonreturn valve normally defining a one-way gas flow passage from the second chamber of said canister to said mouth engaging element; and an expansible breathing bag coupled to said canister and defining at least a portion of a gas flow passage from said first chamber of said canister to said second chamber thereof.
Claim 4
Dependent Claim
195 words
A breathing apparatus comprising: an element engageable with a user''s mouth; a partitioned canister having first and second chambers therein, wherein said canister is of a substantially rectangular configuration and has a central partition parallel to the two sidewalls thereof to define said two chambers therein; means for retaining a separate charge of carbon dioxide absorbent material in each of said chambers; wherein said means for retaining said charges of absorbent material in said chambers comprise a pair of spaced-apart gas-pervious screens extending between opposite ends of the associated chamber in an oblique relationship to said center partition whereby tapered plenum regions are defined at opposite sides of each of said charges of material in each of said chambers, an exhalation nonreturn valve providing a one-way gas flow passage from said mouth-engaging element to said first chamber of said canister; an inhalation nonreturn valve normally defining a one-way gas flow passage from the second chamber of said canister to said mouth engaging element; and an expansible breathing bag coupled to said canister and defining at least a portion of a gas flow passage from said first chamber of said canister to said second chamber thereof.
Claim 5
Dependent Claim
38 words
A breathing apparatus as defined in claim 2 wherein said pair of screens in each off said chambers are divergent in one direction whereby said charge of absorbent material therebetween is of a nonuniform thickness along said screens.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |