Patent US4970176A successfully refreshed from Google Patents.
US3684656A
Expired / Lapsed
US
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Process for the micro-biological preparation of steroids
Assignee: DSM Delft BV
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Filing: 1970-04-27
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Granted: 1972-08-15
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Expires: 1990-04-27
Abstract
Abstract PROCESS FOR THE MICROBIOLOGICAL 17-SIDE CHAIN DEGRADATION OF STEROIDS HAVING THE CARBON SKELETON SHOWN BELOW: ANDROSTANE AND BEARING AT CARBON ATOM 17 AN ALIPHATIC GROUP WITH A MINIMUM OF 8 CARBON ATOMS. ENZYMES OF MICRO-ORGANISMS ARE USED WHICH, WITH NO INHIBITOR PRESENT, WOULD ATTACK THE CARBON SKELETON SHOWN ABOVE. THIS ATTACK IS AVOIDED BY USING INORGANIC IONS AS INHIBITORS.
Inventors
- 👤 Willem F Van Der Waard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:22
CPC Classifications
C; C12; C12P; C12P33/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/84; Y10S435/863; Y10S435/866
Claims Analysis
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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 |