US2299141A
Expired / Lapsed
US
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Nitrogenous anthraquinone derivative
Assignee: FIRM SOCIETY OF CHEMICAL INDUSTRY IN BASLE
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Filing: 1938-07-26
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Granted: 1942-10-20
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Expires: 1958-07-26
Abstract
No abstract record available.
Inventors
- 👤 Hauser Hermann
- 👤 Bommer Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:53
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42; C09B3/00; C09B3/02; C09B3/06; C09B3/10; C09B5/00; C09B5/24; C09B5/26; C09B5/28
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) | 1945-10-19 | 1946-04-20 | 1946-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-19 | 1950-04-20 | 1950-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-19 | 1954-04-20 | 1954-10-20 | $7700.00 | Window Closed / Lapsed |