Patent US3658814A successfully refreshed from Google Patents.
US3658814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-(omega-chloroalkyl)-6-aryl substituted-4 5-dihydropyridazin(2h)-3-one
Assignee: Sandoz AG
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Filing: 1970-03-17
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Granted: 1972-04-25
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Expires: 1990-03-17
Abstract
Abstract 2-(WI-CHLOROALKYL)-6-ARYL OR HETEROCYCLIC SUBSTITUTED4,5-DIHYDROPYRIDAZIN(2H)-3-ONES, E.G., 2-(4-CHLOROBUTYL)6-(2-THIENYL)-4,5-DIHYDROPYRIDAZIN(2H)-3-ONES, ARE PREPARED BY CHLORINATING THE CONDENSATION PRODUCT FORMED BY CONDENSING W-HYDRAZINOALKANOLS WITH ARYL OR HETEROCYCLIC-Y-KETOBUTYRIC ACIDS AND ARE USEFUL AS INTERMEDIATES IN PREPARING ANTI-DEPRESSANTS AND ANALGESICS.
Inventors
- 👤 William J Houlihan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:22
CPC Classifications
C; C07; C07D; C07D409/00; C07D409/02; C07D409/04; C07D237/00; C07D237/02; C07D237/04
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |