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Patent US2797254A successfully refreshed from Google Patents.
US2797254A
Expired / Lapsed
US
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Gas permeable membrane for air depolarized cell
Assignee: Union Carbide Corp
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Filing: 1954-02-10
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Granted: 1957-06-25
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Expires: 1974-02-10
Abstract
No abstract record available.
Inventors
- 👤 Erwin A Schumacher
- 👤 Roswell J Bennett
- 👤 Paul S Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:32
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
25 words
IN AN AIR-DEPOLARIZED CELL INCLUDING AN IMPERVIOUS OUTER CELL WALL, AN ACTIVE, POROUS CARBON CATHODE ANDD AN ANODE WITHIN SAID CELL, AN ELECTROLYTE SOLUTION BETWEEN
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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) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |