Patent US3888901A successfully refreshed from Google Patents.
US3888901A
Expired / Lapsed
US
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Process of preparing 3-alkyl-3-(benzoyl)propionitriles
Assignee: Wyeth Holdings LLC
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Filing: 1973-12-06
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Granted: 1975-06-10
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Expires: 1993-12-06
Abstract
Abstract This disclosure describes compounds of the class of 3-alkyl-3(substituted-benzoyl)propionitriles useful as intermediates for the preparation of certain long-acting hypotensive agents of the 6-(substituted-phenyl)-5-alkyl-4,5-dihydro-3(2H)-pyridazinone class.
Inventors
- 👤 Jr George Rodger Allen
- 👤 Francis Joseph Mcevoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:23
CPC Classifications
C; C07; C07C; C07C255/00; C07C253/00; C07C59/00; C07C59/40; C07C59/76; C07C59/88
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
8 words
THE PROCESS OF PREPARING COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
8 words
THE PROCESS OF PREPARING COMPOUNDS OF THE FORMULA:
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein R1 is p-acetamido and R2 is methyl.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein R1 is m-nitro and R2 is methyl.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein R1 is p-bromo and R2 is methyl.
Claim 6
Dependent Claim
14 words
A process according to claim 1 wherein R1 is p-chloro and R2 is methyl.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein R1 is p-acetamido and R2 is ethyl.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein R1 is p-fluoro and R2 is methyl.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |