Patent US2273795A successfully refreshed from Google Patents.
US2273795A
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US
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Electrolytic process
Assignee: National Carbon Co Inc
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Filing: 1936-12-31
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Granted: 1942-02-17
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Expires: 1956-12-31
Abstract
No abstract record available.
Inventors
- 👤 George W Heise
- 👤 Erwin A Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/12; C25; C25B; C25B1/00; C25B1/01; C25B1/14; C25B1/16; C25B11/00; C25B11/04; C25B11/042; C25B11/043; C25C; C25C7/00; C25C7/02
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) | 1945-02-16 | 1945-08-18 | 1946-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-16 | 1949-08-18 | 1950-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-16 | 1953-08-18 | 1954-02-17 | $7700.00 | Window Closed / Lapsed |