Patent US1723271A successfully refreshed from Google Patents.
US1723271A
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US
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Treatment of cellulose derivatives
Assignee: Celanese Corp
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Filing: 1927-05-17
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Granted: 1929-08-06
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Expires: 1947-05-17
Abstract
No abstract record available.
Inventors
- 👤 Ellis George Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:04
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/90; D06P1/92; D06P1/922; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04; Y10S8/00; Y10S8/92; Y10S8/921
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) | 1932-08-05 | 1933-02-04 | 1933-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-08-05 | 1937-02-04 | 1937-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-08-05 | 1941-02-04 | 1941-08-06 | $7700.00 | Window Closed / Lapsed |