US1914945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coloration of materials
Assignee: Celanese Corp
•
Filing: 1928-07-28
•
Granted: 1933-06-20
•
Expires: 1948-07-28
Abstract
No abstract record available.
Inventors
- 👤 Ellis George Holland
- 👤 Olpin Henry Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:14
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/34; D06P3/40; D06P3/42; D06P1/00; D06P1/44; D06P1/673; D06P1/67333; D06P1/6735; D06P1/67366; 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) | 1936-06-19 | 1936-12-19 | 1937-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-19 | 1940-12-19 | 1941-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-19 | 1944-12-19 | 1945-06-20 | $7700.00 | Window Closed / Lapsed |