US3297729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 17alpha-esters of 17alpha-hydroxy-3-keto-delta4-pregnenes
Assignee: Pfizer Italia SRL
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Filing: 1965-03-30
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Granted: 1967-01-10
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Expires: 1985-03-30
Abstract
No abstract record available.
Inventors
- 👤 Mancini Franco
- 👤 Sciaky Roberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:57
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/56; A61K31/57; A61K31/573; C; C07; C07J; C07J5/00; C07J7/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PREPARATION OF 17 A-ESTERS OF 17 AHYDROXY-3-KETO-$4-PREGNENES WITH ANALIPHATIC ORGANCI ACID HAVING FROM 2 TO 8 CARBON ATOMS, WHICH COMPRISES REACTING A 17 A-HYDROXY-3-KETO-$-PREGENENE WITH AN ACYLATING COMPLEX CONSISTING OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS PENTACHLORIDE AND ANTIMONY PENTACHLORIDE AND OF AN ACYL CHLORIDE DERIVED FROM ABOVE-MENTIONED ORGANIC ACIDS, DISSOLVED IN A SOLVENT OF THE GROUP OF LOWE NITROPARAFFINS, AT A TEMPERATURE BETWEEN - 30*C. AND ROOM TEMPERATURE FOR A PERIOD BETWEEN 30 MINUTES AND SOME HOURS, ISOLATING AND PURIFYING 17 A-ACYLOXY-3-KETO-$4-PREGNENE SO OBTAINED.
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE PREPARATION OF 17 A-ESTERS OF 17 AHYDROXY-3-KETO-$4-PREGNENES WITH ANALIPHATIC ORGANCI ACID HAVING FROM 2 TO 8 CARBON ATOMS, WHICH COMPRISES REACTING A 17 A-HYDROXY-3-KETO-$-PREGENENE WITH AN ACYLATING COMPLEX CONSISTING OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS PENTACHLORIDE AND ANTIMONY PENTACHLORIDE AND OF AN ACYL CHLORIDE DERIVED FROM ABOVE-MENTIONED ORGANIC ACIDS, DISSOLVED IN A SOLVENT OF THE GROUP OF LOWE NITROPARAFFINS, AT A TEMPERATURE BETWEEN - 30*C. AND ROOM TEMPERATURE FOR A PERIOD BETWEEN 30 MINUTES AND SOME HOURS, ISOLATING AND PURIFYING 17 A-ACYLOXY-3-KETO-$4-PREGNENE SO OBTAINED.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |