US3360439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 1-dehydro steroids
Assignee: ER Squibb and Sons LLC
•
Filing: 1964-08-19
•
Granted: 1967-12-26
•
Expires: 1984-08-19
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Erickson
- 👤 William E Brown
- 👤 Richard W Thoma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:21
CPC Classifications
C; C12; C12P; C12P33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A PROCESS FOR SELECTIVELY 1-DEHYDROGENATING A 1,2SATURATED STEROID OF THE 3,20-DIKETO-$4-PREGNENE SERIES, WHICH PROCESS COMPRISES THE STEPS OF SUBJECTING THE STEROID TO THE ACTION OF THE CELLS OF A 1-DEHYDROGENATING MICROORGANISM IN THE PRESENCE OF A HYDROGEN CARRIER, AND RECOVERING THE 1-DEHYDORGNATED STEROID FORMED, THE IMPROVEMENT WHICH COMPRISES PRETREATING AN AQUEOUS SUSPENSION OF SUCH CELLS WITH FROM ABOUT FIVE TO ABOUT TWENTY VOLUMES PER VOLUME OF SUSPENSION OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LOWER ALKANOLS AND LOWER ALKANONES AT A TEMPERATURE OF ABOUT 0*C. TO ABOUT 5*C. FOR A TIME SUFFICIENT TO INACTIVATE THE 20 KETO REDUCTASE ACTIVITY OF THE CELLS, AND SEPARATING THE TREATED CELLS FROM THE SOLVENT PRIOR TO CONTACT WITH THE STEROID.
Claim 2
Dependent Claim
119 words
IN A PROCESS FOR SELECTIVELY 1-DEHYDROGENATING A 1,2SATURATED STEROID OF THE 3,20-DIKETO-$4-PREGNENE SERIES, WHICH PROCESS COMPRISES THE STEPS OF SUBJECTING THE STEROID TO THE ACTION OF THE CELLS OF A 1-DEHYDROGENATING MICROORGANISM IN THE PRESENCE OF A HYDROGEN CARRIER, AND RECOVERING THE 1-DEHYDORGNATED STEROID FORMED, THE IMPROVEMENT WHICH COMPRISES PRETREATING AN AQUEOUS SUSPENSION OF SUCH CELLS WITH FROM ABOUT FIVE TO ABOUT TWENTY VOLUMES PER VOLUME OF SUSPENSION OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LOWER ALKANOLS AND LOWER ALKANONES AT A TEMPERATURE OF ABOUT 0*C. TO ABOUT 5*C. FOR A TIME SUFFICIENT TO INACTIVATE THE 20 KETO REDUCTASE ACTIVITY OF THE CELLS, AND SEPARATING THE TREATED CELLS FROM THE SOLVENT PRIOR TO CONTACT WITH THE STEROID.
References Cited (Backward Citations)
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US3037915A
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US3022226A
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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) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |