US2671092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-methyl-delta-dehydroestrogens and process
Assignee: Syntex SA
•
Filing: 1950-03-31
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Granted: 1954-03-02
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Expires: 1970-03-31
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
2026-11-01 13:30
CPC Classifications
C; C07; C07J; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A PROCESS FOR THE PRODUCTION OF 1-METHYL-$6ESTROGEN COMPOUNDS HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
12 words
A PROCESS FOR THE PRODUCTION OF 1-METHYL-$6ESTROGEN COMPOUNDS HAVING THE FOLLOWING FORMULA:
References Cited (Backward Citations)
US2280828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |