US2128338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored organic derivatives of cellulose and method of making same
Assignee: Celanese Corp
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Filing: 1934-07-25
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Granted: 1938-08-30
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Expires: 1954-07-25
Abstract
No abstract record available.
Inventors
- 👤 Whitehead William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:08
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/06; C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J2301/00; C08J2301/08
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) | 1941-08-29 | 1942-02-28 | 1942-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-29 | 1946-02-28 | 1946-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-29 | 1950-02-28 | 1950-08-30 | $7700.00 | Window Closed / Lapsed |