US3661976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4'-(2-cycloalkyl-alkylidene) diphenols and ethers and esters thereof
Assignee: Parke Davis and Co LLC
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Filing: 1969-05-16
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Granted: 1972-05-09
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Expires: 1989-05-16
Abstract
Abstract A SERIES OF 4,4''-(2-CYCLOALKYLALKYLIDENE)DIPHENOLS; LOWER ALKYL AND TETRAHYDROPYRANYL ETHERS; AND ESTER WITH CARBOXYLIC AND SULFONIC ACIDS. THE COMPOUNDS HAVE PHARMACOLOGICAL ACTIVITIES, ESPECIALLY AS ANTI-FERTILITY AGENTS, THEY CAN BE PRODUCED BY (A) REACTING A SUBSTITUTED PHENYL-MAGNESIUM BROMIDE WITH A CARBOXYLATE ESTER AND HYDROLYZING AND DEHYDRATNG THE PRODUCT, (B) HYDROLYZING AND ETHER, (C) ESTERIFYING A DIPHENO, (D) HYDROLYZING AN ESTER, OR (E) CONVERTING A DIPHENOL TO AN ETHER.
Inventors
- 👤 Eugene L Wittle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:09
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/055; C07C37/0555; C07C37/11; C07C39/00; C07C39/23; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |