Patent US3759791A successfully refreshed from Google Patents.
US3759791A
Expired / Lapsed
US
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Selective microbiological preparation of androst-4-ene-3,17-dione
Assignee: GD Searle LLC
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Filing: 1970-12-10
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Granted: 1973-09-18
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Expires: 1990-12-10
Abstract
Abstract A PROCESS IS DISCLOSED FOR PREPARING ANDROST-4-ENE-3,17DIONE BY FERMENTING WITH MYCOBACTERIUM SP. N.R.R.L. B-3805 OR ENZYMES THEREOF A STEROID WHEREIN CARBON ATOM NUMBER 17 IS SUBSTITUTED BY ALKYL.
Inventors
- 👤 W Marsheck
- 👤 S Kraychy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:38
CPC Classifications
C; C12; C12P; C12P33/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/863; Y10S435/866
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |