Patent US2520656A successfully refreshed from Google Patents.
US2520656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
delta-3-hydroxysteroid and derivatives thereof
Assignee: Organon NV
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Filing: 1946-04-05
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Granted: 1950-08-29
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Expires: 1966-04-05
Abstract
No abstract record available.
Inventors
- 👤 Reichstein Tadeus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:25
CPC Classifications
C; C07; C07J; C07J9/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE MANUFACTURE OF A 5,6UNSATURATED COMPOUND OF THE CYCLOPENTANOPOLYHYDROPHENANTHRENE SERIES SUBSTITUTED IN THE 3POSITION BY A MEMBER SELECTED FROM THE CLASS CONSISTING OF FREE AND ESTERIFIED HYDROXYL GROUPS, BY ELIMINATING FROM A COMPOUND OF THE SAID SERIES WHICH IS SUBSTITUTED IN EACH OF THE POSITIONS 3 AND 6 BY A MEMBER SELECTED FROM THE CLASS CONSISTING OF FREE AND ESTERIFIED HYDROXYL GROUPS ONLY THE SUBSTITUENT IN THE 6-POSITION WITH FORMATION OF A DOUBLE BOND AND WITHOUT ELIMINATING THE SUBSTITUENT IN THE 3-POSITION, WHICH COMPRISES SUBJECTING THE STARTING COMPOUND TO THE ACTION OF HEAT, WHEREBY THE 6-SUBSTITUENT IS SELECTIVELY ELIMINATED AND A 5,6-DOUBLE BOND FORMED.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE MANUFACTURE OF A 5,6UNSATURATED COMPOUND OF THE CYCLOPENTANOPOLYHYDROPHENANTHRENE SERIES SUBSTITUTED IN THE 3POSITION BY A MEMBER SELECTED FROM THE CLASS CONSISTING OF FREE AND ESTERIFIED HYDROXYL GROUPS, BY ELIMINATING FROM A COMPOUND OF THE SAID SERIES WHICH IS SUBSTITUTED IN EACH OF THE POSITIONS 3 AND 6 BY A MEMBER SELECTED FROM THE CLASS CONSISTING OF FREE AND ESTERIFIED HYDROXYL GROUPS ONLY THE SUBSTITUENT IN THE 6-POSITION WITH FORMATION OF A DOUBLE BOND AND WITHOUT ELIMINATING THE SUBSTITUENT IN THE 3-POSITION, WHICH COMPRISES SUBJECTING THE STARTING COMPOUND TO THE ACTION OF HEAT, WHEREBY THE 6-SUBSTITUENT IS SELECTIVELY ELIMINATED AND A 5,6-DOUBLE BOND FORMED.
References Cited (Backward Citations)
US2366204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |