Patent US1574844A successfully refreshed from Google Patents.
US1574844A
Expired / Lapsed
US
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Process for protecting gas-absorbing substances from penetration by liquid
Assignee: Mersen SA
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Filing: 1923-04-26
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Granted: 1926-03-02
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Expires: 1943-04-26
Abstract
No abstract record available.
Inventors
- 👤 Oppenheim Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:22
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10
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) | 1929-03-01 | 1929-08-31 | 1930-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-03-01 | 1933-08-31 | 1934-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-03-01 | 1937-08-31 | 1938-03-02 | $7700.00 | Window Closed / Lapsed |