Patent US1939235A successfully refreshed from Google Patents.
US1939235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making cellulose acetate
Assignee: Eastman Kodak Co
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Filing: 1928-12-22
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Granted: 1933-12-12
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Expires: 1948-12-22
Abstract
No abstract record available.
Inventors
- 👤 Cyril J Staud
- 👤 Charles S Webber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:16
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/02
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) | 1936-12-11 | 1937-06-12 | 1937-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-11 | 1941-06-12 | 1941-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-11 | 1945-06-12 | 1945-12-12 | $7700.00 | Window Closed / Lapsed |