US2768189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing alpha-brominated keto steroid compounds
Assignee: Laboratoires Francais de Chimiotherapie SA
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Filing: 1953-06-11
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Granted: 1956-10-23
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Expires: 1973-06-11
Abstract
No abstract record available.
Inventors
- 👤 Nomine Gerard
- 👤 Warnant Julien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:35
CPC Classifications
C; C07; C07J; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN A PROCESS OF PRODUCING 2,4-DIBROMO-17A-HYDROXY PREGNANE-3,11,20-TRIONE, THE STEPS COMPRISING HEATING A MIXTURE OF 1 MOL EQUIVALENT OF 3A, 17A-DIHYDROXY PREGNANE-11,20-DIONE, ABOUT 4 MOL EQUIVALENTS OF N-BROMOSUCCINIMIDE, AND ABOUT 1 MOL EQUIVALENT OF BENZYL ALCOHOL, IN ABOUT 98.5% ACETIC ACID TO ABOUT 60* C. UNTIL THE REACTION MIXTURE DOES NOT REACT WITH POTASSIUM IODIDESTARCH PAPER AND ISOLATING THE RESULTING 2,4,-DIBROMO-17AHYDROXY PREGNANE-3,11-20-TRIONE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
65 words
IN A PROCESS OF PRODUCING 2,4-DIBROMO-17A-HYDROXY PREGNANE-3,11,20-TRIONE, THE STEPS COMPRISING HEATING A MIXTURE OF 1 MOL EQUIVALENT OF 3A, 17A-DIHYDROXY PREGNANE-11,20-DIONE, ABOUT 4 MOL EQUIVALENTS OF N-BROMOSUCCINIMIDE, AND ABOUT 1 MOL EQUIVALENT OF BENZYL ALCOHOL, IN ABOUT 98.5% ACETIC ACID TO ABOUT 60* C. UNTIL THE REACTION MIXTURE DOES NOT REACT WITH POTASSIUM IODIDESTARCH PAPER AND ISOLATING THE RESULTING 2,4,-DIBROMO-17AHYDROXY PREGNANE-3,11-20-TRIONE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |