US3790572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-hydroxyalkyl-4,5-dihydropyridazin-3(2h)-one derivatives
Assignee: Sandoz AG
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Filing: 1972-08-14
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Granted: 1974-02-05
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Expires: 1992-08-14
Abstract
Abstract DERIVATIVES OF 2-HYDROXYALKYL-6-ARYL OR HETEROCYCLIC SUBSTITUTED-4,5-DIHYDROPYRIDAZIN-3(2H)-ONES, E.G., 6-(PCHLORIPHENYL) -2-(2-N-METHYLCARBAMOYLOXYBUTYL)-4,5DIHYDROPYRIDAZIN-3(2H)-ONE ARE PREPARED BY REACTING 2HYDROXYALKYL-6- SUBSTITUTED -45- DIHYDROPYRIDAZIN3(2H)-ONE WITH ORGANIC ACID HALIDES OR ANHYDRIDES, ISOCYANATES, DIHYDROFURAN OR DIHYDROPYRAN OR BY TREATING 2ALKOXYCARBONYL HALIDE-6-SUBSTITUTED -4,5-DIHYDROPYRIDAZIN3(2H)-ONE WITH AMINES AND ARE USEFUL AS CENTRAL NERVOUS DEPRESSANTS.
Inventors
- 👤 W Houlihan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:16
CPC Classifications
C; C07; C07D; C07D401/00; C07D401/02; C07D401/04; C07D237/00; C07D237/02; C07D237/04; C07D237/06; C07D237/10; C07D237/14; C07D405/00; C07D405/02; C07D405/04; C07D409/00; C07D409/02; C07D409/04
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |