Patent US2935511A successfully refreshed from Google Patents.
US2935511A
Expired / Lapsed
US
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Process of preparing 11 beta-hydroxy steroids
Assignee: Merck and Co Inc
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Filing: 1958-09-03
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Granted: 1960-05-03
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Expires: 1978-09-03
Abstract
No abstract record available.
Inventors
- 👤 Taub David
- 👤 Robert D Hoffsommer
- 👤 Norman L Wendler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:43
CPC Classifications
C; C07; C07J; C07J21/00; C07J75/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/832
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
THE PROCESS WHICH COMPRISES INTIMATELY CONTACTING A 17-20,20-21-BISMETHYLENEDIOXY-3,11-DIKETO STEROID THE PREGNANE SERIES, HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
16 words
THE PROCESS WHICH COMPRISES INTIMATELY CONTACTING A 17-20,20-21-BISMETHYLENEDIOXY-3,11-DIKETO STEROID THE PREGNANE SERIES, HAVING THE GENERAL FORMULA:
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |