US2883379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing 3-keto-delta-steroids
Assignee: Pfizer Inc
•
Filing: 1958-08-18
•
Granted: 1959-04-21
•
Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 Walter T Moreland
- 👤 Eugene J Agnello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:27
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF A 3-KETO*1,4,6-STERIOD COMPOUND HAVING FROM 18 TO 21 CARBON ATOMS IN THE STERIOD NUCLEUS, WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 3-KETO A-RING SATURATED, 3-KETO-*4, AND 3-KETO-*4,6-STERIODS, WITH A QUINONE HAVING AN OXIDATION-REDUCTION POTENTIAL OF LESS THAN ABOUT -0.5, AT A TEMPERATURE OF FROM ABOUT 110* C. TO ABOUT 155*C. IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALKANOLS CONTAINING UP TO NINE CARBON ATOMS, IN THE PRESENCE OF A PARTICULATE SOLID SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, STRONTIUM CARBONATE, GERMANIUM AND GLASS.
Claim 2
Dependent Claim
100 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF A 3-KETO*1,4,6-STERIOD COMPOUND HAVING FROM 18 TO 21 CARBON ATOMS IN THE STERIOD NUCLEUS, WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 3-KETO A-RING SATURATED, 3-KETO-*4, AND 3-KETO-*4,6-STERIODS, WITH A QUINONE HAVING AN OXIDATION-REDUCTION POTENTIAL OF LESS THAN ABOUT -0.5, AT A TEMPERATURE OF FROM ABOUT 110* C. TO ABOUT 155*C. IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALKANOLS CONTAINING UP TO NINE CARBON ATOMS, IN THE PRESENCE OF A PARTICULATE SOLID SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, STRONTIUM CARBONATE, GERMANIUM AND GLASS.
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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |