US3657266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
V-triazolylcoumarins
Assignee: Novartis Corp
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Filing: 1970-09-02
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Granted: 1972-04-18
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Expires: 1990-09-02
Abstract
Abstract NEW 3-PHENYL-7-V-TRIAZOLYLCOUMARINS ARE USED AS OPTICAL BRIGHTENERS OF ORGANIC MATERIALS. THE NEW COUMARINS ARE PREPARED BY CONDENSING THE OXINE HYDRAZONES OBTAINED BY REACTING THIONAPHTHENEQUINONE-2-OXIMES OR 2-ISONITROSOCOUMARANONES-3 OR THIONAPHTHENEQUINONE-1,1-DIOXIDE-2OXIMES WITH 3-PHENYL-7-HYDRAZINOCOUMARINS.
Inventors
- 👤 Rudolf Kirchmayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07D491/044; C07D491/048; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2933; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31971
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |