Patent US2487892A successfully refreshed from Google Patents.
US2487892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose acetate
Assignee: Eastman Kodak Co
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Filing: 1946-03-26
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Granted: 1949-11-15
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Expires: 1966-03-26
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
- 👤 Robert H Macclaren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:15
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1728471A
Cited
US1936585A
Cited
GB414461A
Cited
US2039290A
Cited
US2140639A
Cited
US2143785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |