US2008902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coloration of materials
Assignee: Celanese Corp
•
Filing: 1931-03-19
•
Granted: 1935-07-23
•
Expires: 1951-03-19
Abstract
No abstract record available.
Inventors
- 👤 Ellis George Holland
- 👤 Olpin Henry Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:30
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/96; C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; D06P1/44; D06P1/64; D06P1/642; D06P1/6429; D06P3/00; D06P3/34; D06P3/40; D06P3/42; Y; Y10; Y10S; 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) | 1938-07-22 | 1939-01-21 | 1939-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-07-22 | 1943-01-21 | 1943-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-07-22 | 1947-01-21 | 1947-07-23 | $7700.00 | Window Closed / Lapsed |