US2940990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
17-diacetals of estrone
Assignee: Syntex SA
•
Filing: 1956-05-22
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Granted: 1960-06-14
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Expires: 1976-05-22
Abstract
No abstract record available.
Inventors
- 👤 Volkov Esteban
- 👤 Rosenkranz George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:42
CPC Classifications
C; C07; C07J; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD FOR THE PRODUCTION OF A 3-LOWER ALKOXY 19 - NOR - $2,5(10) - ANDROSTADIENE-17-ONE WHICH COMPRISES FORMING THE 17-DIACETAL OF ESTRONE BY REACTING ESTRONE WITH ETHYL ORTHOFORMATE, CONVERTING THE 17-DIACETAL OF ESTRONE INTO THE CORRESPONDING 3-LOWER ALKOXY ETHER, TREATING THE 3-LOWER ALKOXY ETHER WITH AN ALKALI METAL IN LIQUID AMMONIA TO REDUCE THE AROMATIC SYSTEM IN RING A TO A DIENE SYSTEM AND PREPARE THE 17-DIACETAL OF 3METHOXY-19-NOR-$2,5(10)-ANDROSTADIENE-17-ONE AND THEREAFTER SELECTIVELY HYDROLYZING THE DIACETAL GROUP AT C-17 BY A SHORT ACID TREATMENT.
Claim 2
Independent Claim
84 words
A METHOD FOR THE PRODUCTION OF A 3-LOWER ALKOXY 19 - NOR - $2,5(10) - ANDROSTADIENE-17-ONE WHICH COMPRISES FORMING THE 17-DIACETAL OF ESTRONE BY REACTING ESTRONE WITH ETHYL ORTHOFORMATE, CONVERTING THE 17-DIACETAL OF ESTRONE INTO THE CORRESPONDING 3-LOWER ALKOXY ETHER, TREATING THE 3-LOWER ALKOXY ETHER WITH AN ALKALI METAL IN LIQUID AMMONIA TO REDUCE THE AROMATIC SYSTEM IN RING A TO A DIENE SYSTEM AND PREPARE THE 17-DIACETAL OF 3METHOXY-19-NOR-$2,5(10)-ANDROSTADIENE-17-ONE AND THEREAFTER SELECTIVELY HYDROLYZING THE DIACETAL GROUP AT C-17 BY A SHORT ACID TREATMENT.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |