US3684657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective microbiological degradation of steroidal 17-alkyls
Assignee: GD Searle LLC
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Filing: 1970-05-11
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Granted: 1972-08-15
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Expires: 1990-05-11
Abstract
Abstract A PROCESS IS DISCLOSED FOR PREPARING ANDROST-4-ENE-3,17DIONE, ANDROSTA-1,4-DIENE-3,17-DIONE, AND/OR 20X-HYDROXYMETHYLPREGNA-1,4-DIENE-3-ONE BY FERMENTING WITH MYCOBACTERIUM SP. N.R.R.L. B-3683 OR ENZYMES THEREOF A STEROID WHEREIN CARBON ATOM NUMBER 17 IS SIBSTITUTED BY ALKYL.
Inventors
- 👤 Stephen Kraychy
- 👤 William J Marsheck
- 👤 Robert D Muir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:46
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |