Patent US2051005A successfully refreshed from Google Patents.
US2051005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing n-substitution products of 1, 4-diaminoanthraquinones
Assignee: General Aniline Works Inc
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Filing: 1934-09-10
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Granted: 1936-08-11
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Expires: 1954-09-10
Abstract
No abstract record available.
Inventors
- 👤 Koeberle Karl
- 👤 Steigerwald Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:21
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/201
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) | 1939-08-11 | 1940-02-10 | 1940-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-11 | 1944-02-10 | 1944-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-11 | 1948-02-10 | 1948-08-11 | $7700.00 | Window Closed / Lapsed |