US2769020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the isolation of 11, 20-diketo pregnanes and products obtained thereby
Assignee: Merck Sharp & Dohme LLC
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Filing: 1952-03-11
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Granted: 1956-10-30
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Expires: 1972-03-11
Abstract
No abstract record available.
Inventors
- 👤 Emanuel B Hershberg
- 👤 Lamb Catherine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:46
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE PROCESS FOR THE SEPARATION OF 11,20-DIKETOPREGNANES FROM THE MIXTURE OF CARBONYL COMPOUNDS IN THE REACTION MIXTURE RESULTING FROM THE ODIXATION OF $20,233-OR''''-11-KETO-12-R''-24-DI-X-CHOLADIENE, WHEREIN R'' IS A MEMBER OF THE GROUP CONSISTING OF H, BR AND CL; R'''' IS A MEMBER OF THE CLASS CONSISTING OF LOWER CARBOXYLIC ALKANOYL, CARBOXYLIC AROYL, LOWER ALKYL, AND PHENYL GROUPS, AND X IS A HYDROCARBON RADICAL, WHICH COMPRISES REACTING THE MIXTURE WITH A KETONE REAGENT OF THE TYPE WHICH ON CONDENSATION WITH THE KETONE WITH ELIMINATION OF WATER FORMS AN AZOMETHINE GROUP, AND SEPARATING THE PRECIPITATE THAT IS FORMED.
Claim 2
Dependent Claim
95 words
THE PROCESS FOR THE SEPARATION OF 11,20-DIKETOPREGNANES FROM THE MIXTURE OF CARBONYL COMPOUNDS IN THE REACTION MIXTURE RESULTING FROM THE ODIXATION OF $20,233-OR''''-11-KETO-12-R''-24-DI-X-CHOLADIENE, WHEREIN R'' IS A MEMBER OF THE GROUP CONSISTING OF H, BR AND CL; R'''' IS A MEMBER OF THE CLASS CONSISTING OF LOWER CARBOXYLIC ALKANOYL, CARBOXYLIC AROYL, LOWER ALKYL, AND PHENYL GROUPS, AND X IS A HYDROCARBON RADICAL, WHICH COMPRISES REACTING THE MIXTURE WITH A KETONE REAGENT OF THE TYPE WHICH ON CONDENSATION WITH THE KETONE WITH ELIMINATION OF WATER FORMS AN AZOMETHINE GROUP, AND SEPARATING THE PRECIPITATE THAT IS FORMED.
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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |