US3743639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brightener of the coumarinyl-styryltriazole series
Assignee: Novartis Corp
•
Filing: 1970-07-08
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Granted: 1973-07-03
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Expires: 1990-07-08
Abstract
Abstract 2-(3-PHENYLCOUMARINYL-(7)) - 4 - M-CHLOROSTYRYL-V-TRIAZOLE IS USED AS BRIGHTENER OF ORGANIC MATERIALS. THE COMPOUND IS PREPARED BY SPLITTING OFF WATER FROM ISONITROSO-MCHLOROBENZALACETONE - (3 - PHENYLCOUMARINYL-(7))-HYDRAZONE.
Inventors
- 👤 H Schlapfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:42
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/04; C07D311/00
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |