US3636004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7-cyano-coumarins
Assignee: Bayer AG
•
Filing: 1969-05-05
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Granted: 1972-01-18
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Expires: 1989-05-05
Abstract
Abstract 7-CYANO-COUMARIN OF THE FORMULA 2-(O=),3-(AR-),7-(NC-)-2H-CHROMENE IN WHICH AR DENTOES AN OPTIONALLY SUBSTITUTED AROMATIC CARBOCYCLIC OR AROMATIC HETEROCYCLIC RADICAL AS DEFINED HEREINBELOW WHICH ARE ADAPTED FOR USE TO PROTECT ORGANIC MATERIALS AGAINST ULTRAVIOLET RADIATION.
Inventors
- 👤 Klaus-Dicter Bode
- 👤 Carl-Wolfgang Schellhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:44
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/08; C07D311/16; C08; C08K; C08K5/00; C08K5/16; C09; C09K; C09K15/00; C09K15/04; C09K15/20
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |