US2837541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved process for preparing 9alpha-fluoro-delta1, 4-3, 20-diketo-11beta, 17alpha-dihydroxy-21-acyloxy-pregnadiene
Assignee: Merck and Co Inc
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Filing: 1955-05-26
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Granted: 1958-06-03
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Expires: 1975-05-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Hirschmann
- 👤 Miller Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:04
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN THE PROCESS OF DEHYDROBRONINATING 2,4-DIBROMO9A - FLUORO - 3,20 - DIKETO - 11B,17A - DIHYDROXY - 21 LOWER ALKANOYLOXY-ALLOPREGNANE TO PRODUCE 9A - FLUORO$1,4-3,20 - DIKETO - 11B, 17A - DIHYDROXY - 21 - LOWER ALKANOYLOXY-PREGNADIENE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID DEHYDROBROMINATION IN THE PRESENCE OF AN N,N-DIALKYL-ACYLAMIDE.
Claim 2
Dependent Claim
50 words
IN THE PROCESS OF DEHYDROBRONINATING 2,4-DIBROMO9A - FLUORO - 3,20 - DIKETO - 11B,17A - DIHYDROXY - 21 LOWER ALKANOYLOXY-ALLOPREGNANE TO PRODUCE 9A - FLUORO$1,4-3,20 - DIKETO - 11B, 17A - DIHYDROXY - 21 - LOWER ALKANOYLOXY-PREGNADIENE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID DEHYDROBROMINATION IN THE PRESENCE OF AN N,N-DIALKYL-ACYLAMIDE.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |