US3793350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 17alpha,21-dihydroxy-20-keto-pregnanes,derivatives and intermediates thereof
Assignee: Roche Palo Alto LLC
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Filing: 1971-10-01
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Granted: 1974-02-19
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Expires: 1991-10-01
Abstract
Abstract NEW PROCESS FOR PREPARING 17A,21 - DIHYDRPXY-20-KETO STEROIDE OF THE PREGNANE SEERIES USEFUL AS ANTI-INFLAMMATORY AGENTS, STARTING FROM 17-(2''A-ACYLOXYVINYLIDENE) ANDROSTANE CMPOUNDS, AND THE NOVEL 17A,21-DIACYLOXY20-KETO-PREGNANES AND 21,21-DIACYLOXY-17A-HYDROXY-20KETONE-PREGNANES OBTAINED AS INTERMEDIATES IN THIS PROCESS.
Inventors
- 👤 P Crabbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:54
CPC Classifications
C; C07; C07J; C07J5/00
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |