US1794218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolone azo dyestuffs and process for preparing the same
Assignee: General Aniline Works Inc
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Filing: 1926-11-15
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Granted: 1931-02-24
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Expires: 1946-11-15
Abstract
No abstract record available.
Inventors
- 👤 Wagner Hermann
- 👤 Eichwede Heinz
- 👤 Fischer Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:41
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/24; C09B29/28; C09B29/30; C09B29/34; C09B29/36; C09B29/3604; C09B29/3647; C09B29/3652; C09B29/366
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) | 1934-02-23 | 1934-08-25 | 1935-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-02-23 | 1938-08-25 | 1939-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-02-23 | 1942-08-25 | 1943-02-24 | $7700.00 | Window Closed / Lapsed |