US3574761A
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Stereo-specific hydrogenation process for the preparation of 9beta,10beta-des a-androst-5-ones and 9beta,10beta-des a-pregnan-5-ones
Assignee: F Hoffmann La Roche AG
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Filing: 1965-10-20
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Granted: 1971-04-13
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Expires: 1985-10-20
Abstract
Abstract A PROCESS FOR CONVERTING $9-5-KETO-DESA-STEROIDS INTO AB, 10B - DESA - STEROIDS BY CATALYTIC HYDROGENATION, SAID 9B,10B-DESA-STEROIDS BEING INTERMEDIATES FOR 9B,10ASTEROIDS HAVING ANABOLIC, ANTI-ANDROGENIC AND PROGESTATIONAL PROPERTIES.
Inventors
- 👤 Milan Radoje Uskokovic
- 👤 Thomas Henry Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:59
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/185; C07C59/215; C07C309/00; C07C309/63; C07C309/64; C07C309/65; C07C309/66; C07C309/72; C07C309/73; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/14; C07C2603/16
Claims Analysis
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |