US1971683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored coal and process of producing the same
Assignee: National Aniline and Chemical Co Inc
•
Filing: 1930-04-19
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Granted: 1934-08-28
•
Expires: 1950-04-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Villiam A Holst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:23
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1092; C10; C10L; C10L9/00; C10L9/10
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) | 1937-08-27 | 1938-02-26 | 1938-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-08-27 | 1942-02-26 | 1942-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-08-27 | 1946-02-26 | 1946-08-28 | $7700.00 | Window Closed / Lapsed |