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Patent US2475678A successfully refreshed from Google Patents.
US2475678A
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US
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Higher cellulose esters
Assignee: Celanese Corp
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Filing: 1945-09-11
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Granted: 1949-07-12
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Expires: 1965-09-11
Abstract
No abstract record available.
Inventors
- 👤 Robert D Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:01
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/06; C08B3/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-11 | 1953-01-10 | 1953-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-11 | 1957-01-10 | 1957-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-11 | 1961-01-10 | 1961-07-12 | $7700.00 | Window Closed / Lapsed |