Patent US3752654A successfully refreshed from Google Patents.
US3752654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorption unit for the absorption of carbon dioxide
Assignee: Siemens AG
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Filing: 1972-02-10
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Granted: 1973-08-14
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Expires: 1992-02-10
Abstract
Abstract IN AN ABSORPTION UNIT FOR THE ABSORPTION OF CARBON DIOXIDE, ESPECIIALLY FOR A BREATHING APPARATUS HAVING A SUBSTANTIALLY CLOSED GAS SYSTEM THE SPACE INSIDE THE UNIT IS DIVIDED IN A PLURALITY OF CHAMBERS, EACH ONE OF WHICH IS FILLED WITH A CARBON DIOXIDE ABSORBING SUBSTANCE AND BOUNDED BY WALLS OF A POROUS MATERIAL PERMITTING THE GAS TO PASS FROM AN INLET OF THE UNIT, THROUGH THE WALLS AND THE SUBSTANCE TO AN OUTLET OF THE UNIT.
Inventors
- 👤 D Johannisson
- 👤 A Wictorin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:28
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/24; A; A62; A62B; A62B19/00; A62B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |