US2923721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 3-keto delta1, 4 steroids
Assignee: Laboratoires Francais de Chimiotherapie SA
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Filing: 1956-12-10
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Granted: 1960-02-02
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Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Joly Robert
- 👤 Warnant Julien
- 👤 Nomine Gerard
- 👤 Bertin Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:34
CPC Classifications
C; C07; C07J; C07J5/00; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE METHOD OF PREPARING $1,4-DIENE 3-KETOSTEROIDS SELECTED FROM THE GROUP CONSISTING OF $1,4-ANDROSTADIENE3-ONE AND $1,4-PREGNADIENE-3-ONE FROM DIHALOGENATED 3-KETOSTEROIDS SELECTED FROM THE GROUP CONSISTING OF 2,4DIBROMO ETIOCHOLANE-3-ONE, 2,4-DIBROMO ANDROSTANE-3 AND 2,4-DIBROMO PREGNANE-3-ONE OF THE FOLLOWING GENERAL STRUCTURE
Claim 2
Independent Claim
36 words
THE METHOD OF PREPARING $1,4-DIENE 3-KETOSTEROIDS SELECTED FROM THE GROUP CONSISTING OF $1,4-ANDROSTADIENE3-ONE AND $1,4-PREGNADIENE-3-ONE FROM DIHALOGENATED 3-KETOSTEROIDS SELECTED FROM THE GROUP CONSISTING OF 2,4DIBROMO ETIOCHOLANE-3-ONE, 2,4-DIBROMO ANDROSTANE-3 AND 2,4-DIBROMO PREGNANE-3-ONE OF THE FOLLOWING GENERAL STRUCTURE
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) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |