Patent US2346210A successfully refreshed from Google Patents.
US2346210A
Expired / Lapsed
US
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Method for improving organic derivatives of cellulose
Assignee: EIDP Inc
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Filing: 1941-02-05
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Granted: 1944-04-11
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Expires: 1961-02-05
Abstract
No abstract record available.
Inventors
- 👤 Bruce S Farquhar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:50
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22; B; B29; B29B; B29B9/00
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) | 1947-04-11 | 1947-10-11 | 1948-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-04-11 | 1951-10-11 | 1952-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-04-11 | 1955-10-11 | 1956-04-11 | $7700.00 | Window Closed / Lapsed |