US3663560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolyl-triazolyl coumarins
Assignee: Bayer AG
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Filing: 1968-05-13
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Granted: 1972-05-16
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Expires: 1988-05-13
Abstract
Abstract 7 - (PYRAZOLYL - (1))-3-(1,2,4-TRIAZOLYL-(1)-)COUMARINS AND THEIR QUATERNIZATION PRODUCTS, ADAPTED FOR USE AS BRIGHTENING AGENTS, ARE PREPARED BY CONDENSING (-HYDRAZINO-3-(1,2,4-TRIAZOLYL(1))-COUMARINS WITH 1,3 - DICARBONYL COMPOUNDS AND OPTIONALLY QUATERNIZING THAT PRODUCT.
Inventors
- 👤 Carl-Wolfgang Schellhammer
- 👤 Alfons Dorlars
- 👤 Wolf-Dieter Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:01
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/12; C07D233/00; C07D233/54; C07D233/56; C07D249/00; C07D249/02; C07D249/08
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |