US2811537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
delta-3, 11, 20-triketo-17-hydroxy-21-acyloxy-pregnadiene
Assignee: Merck and Co Inc
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Filing: 1955-01-25
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Granted: 1957-10-29
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Expires: 1975-01-25
Abstract
No abstract record available.
Inventors
- 👤 Krsek George
- 👤 George G Hazen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:42
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE PROCESS WHICH COMPRISES REACTING A 4- BROMOSTEROID SELECTED FROM THE GROUP WHICH CONSISTS OF $8(9)4 - BROMO - 3,11,20 - TRIKETO - 17 - HYDROXY - 21 - (LOWER ALKANOYLOXY) - PREGNENE AND 4,9 - DIBROMO - 3, 11, 20TRIKETO -17 - HYDROXY - 21 - (LOWER ALKANOYLOXY) - PREGNANE WITH A DEHYDROHALOGENATING AGENT SELECTED FROM THE GROUP WHICH CONSISTS OF TERTIARY AMINES AND SEMICARBAZIDE TO PRODUCE THE CORRESPONDING $4-8(9) - 3,11,20 - TRIKETO17 - HYDROXY - 21 - (LOWER ALKANOYLOXY) - PREGNADIENE.
Claim 2
Dependent Claim
84 words
THE PROCESS WHICH COMPRISES REACTING A 4- BROMOSTEROID SELECTED FROM THE GROUP WHICH CONSISTS OF $8(9)4 - BROMO - 3,11,20 - TRIKETO - 17 - HYDROXY - 21 - (LOWER ALKANOYLOXY) - PREGNENE AND 4,9 - DIBROMO - 3, 11, 20TRIKETO -17 - HYDROXY - 21 - (LOWER ALKANOYLOXY) - PREGNANE WITH A DEHYDROHALOGENATING AGENT SELECTED FROM THE GROUP WHICH CONSISTS OF TERTIARY AMINES AND SEMICARBAZIDE TO PRODUCE THE CORRESPONDING $4-8(9) - 3,11,20 - TRIKETO17 - HYDROXY - 21 - (LOWER ALKANOYLOXY) - PREGNADIENE.
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) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |