Patent US2090948A successfully refreshed from Google Patents.
US2090948A
Expired / Lapsed
US
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Aliphatic acylamino-amino anthraquinone derivatives
Assignee: Celanese Corp
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Filing: 1935-08-14
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Granted: 1937-08-24
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Expires: 1955-08-14
Abstract
No abstract record available.
Inventors
- 👤 Reeves George
- 👤 Olpin Henry Charles
- 👤 Ellis George Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:09
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/40
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) | 1940-08-23 | 1941-02-22 | 1941-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-23 | 1945-02-22 | 1945-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-23 | 1949-02-22 | 1949-08-24 | $7700.00 | Window Closed / Lapsed |