US3586681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,4,5,6-tetrahydropyridazines
Assignee: Sandoz AG
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Filing: 1967-11-02
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Granted: 1971-06-22
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Expires: 1987-11-02
Abstract
Abstract THE COMPOUNDS ARE TO THE CLASS OF 1,3-SUBSTITUTED-1,4, 5,6-TETRAHYDROPYRIDAZINES AND ARE PREPARED BY REDUCING CORRESPONDING 2,6-SUBSTITUTED-4,5-DIHYDRO-3-(2H)-PYRIDAZINONE INTERMEDIATES. THE COMPOUNDS, AS WELL AS CERTAIN INTERMEDIATES, ARE USEFUL AS ANTI-INFLAMMATORY AGENTS.
Inventors
- 👤 William J Houlihan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:20
CPC Classifications
C; C07; C07D; C07D401/00; C07D401/02; C07D401/04; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/495; A61K31/50; C07D237/00; C07D237/02; C07D237/04; C07D401/14; 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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |