US2676181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of steroids
Assignee: Pharmacia and Upjohn Co
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Filing: 1951-11-13
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Granted: 1954-04-20
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Expires: 1971-11-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Hanze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:35
CPC Classifications
C; C07; C07J; C07J7/00; C07J7/0005; C07J7/001; C07J7/0015; C07J7/002; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE PROCESS FOR CONVERSION OF THE 11-HYDROXY GROUP IN 11A-HYDROXYPREGNANE-3,20-DIONE TO A KETO GROUP WHICH COMPRISES: PROVIDING AN AQUEOUS SOLUTION OF CHROMIC ACID BY FORMING AN AQUEOUS SOLUTION OF AN ALKALI-METAL DICHROMATE AND A MINERAL ACID, PROVIDING A SOLUTION OF 11A-HYDROXYPREGNANE-3,20-DIONE IN A BENZENOID ORGANIC SOLVENT WHICH IS SUBSTANTIALLY WATER-IMMISCIBLE, AND MIXING THE TWO SOLUTIONS AT A TEMPERATURE BETWEEN ABOUT MINUS TEN DEGREES AND ABOUT PLUS THIRTY DEGREES CENTIGRADE TO CAUSE OXIDATION OF THE STEROID 11-HYDROXY GROUP TO A KETO GROUP AND SEPARATING THE PREGNANE-3,11,20-TRIONE THUSPRODUCED.
Claim 2
Dependent Claim
86 words
THE PROCESS FOR CONVERSION OF THE 11-HYDROXY GROUP IN 11A-HYDROXYPREGNANE-3,20-DIONE TO A KETO GROUP WHICH COMPRISES: PROVIDING AN AQUEOUS SOLUTION OF CHROMIC ACID BY FORMING AN AQUEOUS SOLUTION OF AN ALKALI-METAL DICHROMATE AND A MINERAL ACID, PROVIDING A SOLUTION OF 11A-HYDROXYPREGNANE-3,20-DIONE IN A BENZENOID ORGANIC SOLVENT WHICH IS SUBSTANTIALLY WATER-IMMISCIBLE, AND MIXING THE TWO SOLUTIONS AT A TEMPERATURE BETWEEN ABOUT MINUS TEN DEGREES AND ABOUT PLUS THIRTY DEGREES CENTIGRADE TO CAUSE OXIDATION OF THE STEROID 11-HYDROXY GROUP TO A KETO GROUP AND SEPARATING THE PREGNANE-3,11,20-TRIONE THUSPRODUCED.
References Cited (Backward Citations)
US1933003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |