Patent US2705237A successfully refreshed from Google Patents.
US2705237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing steroid trienes
Assignee: Syntex SA
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Filing: 1950-03-28
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Granted: 1955-03-29
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Expires: 1970-03-28
Abstract
No abstract record available.
Inventors
- 👤 Djerassi Carl
- 👤 Rosenkranz George
- 👤 Kaufmann Stephen
- 👤 Pataki John
- 👤 Romo Jesus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:21
CPC Classifications
C; C07; C07J; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A PROCESS FOR THE PRODUCTION OF $1,4,6-3-KETOSTEROIDS WHICH COMPRISES DIBROMINATING A $4-3-KETOSTEROID WITH TWO EQUIVALENTS OF A BROMINATING AGENT TO FORM A DIBROMO $4-3-KETOSTEROID CAPABLE OF FORMING ON DEHYDROBROMINATION THE AFORESAID $1,4,6-3-KETOSTEROID AND THEREAFTER DEHYDROBROMINATING SAID DIBROMO $4-3-KETOSTEROID WITH A TERTIARY AMINE.
Claim 2
Dependent Claim
42 words
A PROCESS FOR THE PRODUCTION OF $1,4,6-3-KETOSTEROIDS WHICH COMPRISES DIBROMINATING A $4-3-KETOSTEROID WITH TWO EQUIVALENTS OF A BROMINATING AGENT TO FORM A DIBROMO $4-3-KETOSTEROID CAPABLE OF FORMING ON DEHYDROBROMINATION THE AFORESAID $1,4,6-3-KETOSTEROID AND THEREAFTER DEHYDROBROMINATING SAID DIBROMO $4-3-KETOSTEROID WITH A TERTIARY AMINE.
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) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |