Patent US2833795A successfully refreshed from Google Patents.
US2833795A
Expired / Lapsed
US
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Processes of producing delta-3, 11, 20-triketo-17-hydroxy-21-acyloxy-pregnadienes
Assignee: Merck and Co Inc
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Filing: 1955-10-13
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Granted: 1958-05-06
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Expires: 1975-10-13
Abstract
No abstract record available.
Inventors
- 👤 Robert P Graber
- 👤 Norman L Wendler
- 👤 Jr Calvin Stewart Snoddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:42
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE PROCESS WHICH COMPRISES REACTING $4-3,20DIKETO - 9.11 - OXIDO - 17 - HYDROXY - 21 - LOWER HYDROCARBON CARBONYLOXY-PREGNENE WITH PERCHLORIC ACID TO PRODUCE $4,3(14)-3,20-DIKETO-11,17-DIHYDROXY-21-LOWER HYDROCARBON CARBONYLOXY-PREGNADIENE, AND REACTING THE LATTER COMPOUND WITH AN OXIDIZING AGENT TO FORM $4,8(14)-3,118 20-TRIKETO-17-HYDROXY-21-LOWER HYDROCARBON CARBONYLOXYPREGNADIENE.
Claim 2
Dependent Claim
43 words
THE PROCESS WHICH COMPRISES REACTING $4-3,20DIKETO - 9.11 - OXIDO - 17 - HYDROXY - 21 - LOWER HYDROCARBON CARBONYLOXY-PREGNENE WITH PERCHLORIC ACID TO PRODUCE $4,3(14)-3,20-DIKETO-11,17-DIHYDROXY-21-LOWER HYDROCARBON CARBONYLOXY-PREGNADIENE, AND REACTING THE LATTER COMPOUND WITH AN OXIDIZING AGENT TO FORM $4,8(14)-3,118 20-TRIKETO-17-HYDROXY-21-LOWER HYDROCARBON CARBONYLOXYPREGNADIENE.
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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |