US2596562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 21-acyloxy allopregnanes
Assignee: Syntex SA
•
Filing: 1950-01-23
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Granted: 1952-05-13
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Expires: 1970-01-23
Abstract
No abstract record available.
Inventors
- 👤 Kaufmann Stephen
- 👤 Rosenkranz George
- 👤 Pataki John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:04
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A METHOD FOR PRODUCING 17-HYDROXY-20KETO-21-ACYLOXYL ALLOPREGNANE COMPOUNDS, WHICH COMPRISES REACTING 21-HALOGEN-17A-HYDROXYL-20 KETO ALLOPREGNANE COMPOUNDS WITH AN ALKALI METAL SALT OF A LOWER FATTY ACID IN AN ORGANIC SOLVENT FOR THE 21-HALOGEN-17A-HYDROXY-20-KETO ALLOPREGNANE COMPOUNDS.
Claim 2
Independent Claim
33 words
A METHOD FOR PRODUCING 17-HYDROXY-20KETO-21-ACYLOXYL ALLOPREGNANE COMPOUNDS, WHICH COMPRISES REACTING 21-HALOGEN-17A-HYDROXYL-20 KETO ALLOPREGNANE COMPOUNDS WITH AN ALKALI METAL SALT OF A LOWER FATTY ACID IN AN ORGANIC SOLVENT FOR THE 21-HALOGEN-17A-HYDROXY-20-KETO ALLOPREGNANE COMPOUNDS.
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) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |