US3148034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen generating canisters for closed circuit breathing apparatus
Assignee: MSA Safety Inc
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Filing: 1958-09-26
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Granted: 1964-09-08
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Expires: 1978-09-26
Abstract
No abstract record available.
Inventors
- 👤 Robert M Bovard
- 👤 Carey B Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:13
CPC Classifications
A; A62; A62B; A62B21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN A CLOSED CIRCUIT BREATHING APPARATUS, AT LEAST TWO CHAMBERS FILLED WITH OXYGEN GENERATING MATERIAL AND EACH HAVING AN INLET AND AN OUTLET FOR CONNECTION WITH AN EXHALATION CONDUIT AND AN INHALATION CONDUIT RESPECTIVELY, SAID CHAMBERS FORMING PARTS OF PARALLEL BREATHING CIRCUITS, AND PRESSURE DROP CREATING MEANS OTHER THAN SAID MATERIAL INITIALLY PROVIDING DIFFERENT RESISTANCE TO AIR FLOW THROUGH THE DIFFERENT CHAMBERS, THE DIFFERENCE IN PRESSURE DROP CREATED BY SAID MEANS BEING SUFFICENTLY
Claim 2
Dependent Claim
73 words
IN A CLOSED CIRCUIT BREATHING APPARATUS, AT LEAST TWO CHAMBERS FILLED WITH OXYGEN GENERATING MATERIAL AND EACH HAVING AN INLET AND AN OUTLET FOR CONNECTION WITH AN EXHALATION CONDUIT AND AN INHALATION CONDUIT RESPECTIVELY, SAID CHAMBERS FORMING PARTS OF PARALLEL BREATHING CIRCUITS, AND PRESSURE DROP CREATING MEANS OTHER THAN SAID MATERIAL INITIALLY PROVIDING DIFFERENT RESISTANCE TO AIR FLOW THROUGH THE DIFFERENT CHAMBERS, THE DIFFERENCE IN PRESSURE DROP CREATED BY SAID MEANS BEING SUFFICENTLY
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |