Patent US3824271A successfully refreshed from Google Patents.
US3824271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-alkyl-3-(benzoyl)propionitriles
Assignee: Wyeth Holdings LLC
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Filing: 1972-07-20
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Granted: 1974-07-16
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Expires: 1992-07-20
Abstract
Abstract THIS DISCLOSURE DESCRIBES COMPOUNDS OF THE CLASS OF 3ALKYL-3 (SUBSTITUTED-BENZOYL) PROPIONITRILES USEFUL AS INTERMEDIATES FOR THE PREPARATION OF CERTAIN LONG-ACTING HYPOTENSIVE AGENTS OF THE 6-(SUBSTITUTED-PHENYL)-5-ALKYL4,5-DIHYDRO-3(2H)-PYRIDAZINONE CLASS.
Inventors
- 👤 G Allen
- 👤 F Mcevoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:27
CPC Classifications
C; C07; C07C; C07C255/00
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |