US3712904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7-triazolyl-coumarins
Assignee: Bayer AG
•
Filing: 1969-06-18
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Granted: 1973-01-23
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Expires: 1989-06-18
Abstract
Abstract THIS INVENTION RELATES TO 7-TRIAZOLYL-COUMARINS OF THE FORMULA 3-AR,7-(1-R'',3-R-1H-1,2,4-TRIAZOL-5-YL)-COUMARIN IN WHICH AR AND R DENOTE AN OPTIONALLY SUBSTITUTED AROMATIC OR HETEROAR RADICAL AND R'' DENOTES HYDROGEN OR AN OPTIONALLY SUBSTITUTED ALKYL RADICAL, AND THE COUMARIN RING MAY CONTAIN FURTHER SUBSTITUENTS. THESE MATERIALS ARE USED AS OPTICAL BRIGHTENING AGENTS.
Inventors
- 👤 K Bode
- 👤 C Schellhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3472
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |