Patent US2932656A successfully refreshed from Google Patents.
US2932656A
Expired / Lapsed
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Production of delta1, 4-3, 20-diketopregnadienes from the corresponding semicarbazones
Assignee: Merck and Co Inc
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Filing: 1957-06-19
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Granted: 1960-04-12
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Expires: 1977-06-19
Abstract
No abstract record available.
Inventors
- 👤 John T Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:18
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN A PROCESS FOR PREPARING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE $1.4-3,20-DIKETO-11B,17A,21TRIHYDROXY PREGNADIENES AND 21-LOWER ALIPHATIC CARBOXYLIC ACID ESTERS THEREOF FROM THE CORRESPONDING 3,20-DISEMICARBAZONE, THE IMPROVEMENT WHICH COMPRISES REACTING SAID 3,20-DISEMICARBAZONE WITH A DILUTE MINERAL ACID HAVING A CONCENTRATION NOT GREATER THAN 0.5 N IN THE PRESENCE OF A WATER-IMMISCIBLE ORGANIC SOLVENT, AND RECOVERING THE STEROID PRODUCT FROM SAID SOLVENT.
Claim 2
Dependent Claim
63 words
IN A PROCESS FOR PREPARING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE $1.4-3,20-DIKETO-11B,17A,21TRIHYDROXY PREGNADIENES AND 21-LOWER ALIPHATIC CARBOXYLIC ACID ESTERS THEREOF FROM THE CORRESPONDING 3,20-DISEMICARBAZONE, THE IMPROVEMENT WHICH COMPRISES REACTING SAID 3,20-DISEMICARBAZONE WITH A DILUTE MINERAL ACID HAVING A CONCENTRATION NOT GREATER THAN 0.5 N IN THE PRESENCE OF A WATER-IMMISCIBLE ORGANIC SOLVENT, AND RECOVERING THE STEROID PRODUCT FROM SAID SOLVENT.
References Cited (Backward Citations)
US2781367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |