Patent US2046254A successfully refreshed from Google Patents.
US2046254A
Expired / Lapsed
US
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Vat dyestuffs derived from aceanthrenequinone and process of preparing them
Assignee: General Aniline Works Inc
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Filing: 1933-06-10
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Granted: 1936-06-30
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Expires: 1953-06-10
Abstract
No abstract record available.
Inventors
- 👤 Eckert Wilhelm
- 👤 Sieber Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:13
CPC Classifications
C; C09; C09B; C09B3/00; C09B3/78
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) | 1939-06-30 | 1939-12-30 | 1940-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-06-30 | 1943-12-30 | 1944-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-06-30 | 1947-12-30 | 1948-06-30 | $7700.00 | Window Closed / Lapsed |