US2814630A
Expired / Lapsed
US
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Process for the separation of saturated and unsaturated keto-steroids
Assignee: GNRD Patent Holdings Ltd
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Filing: 1954-07-21
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Granted: 1957-11-26
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Expires: 1974-07-21
Abstract
No abstract record available.
Inventors
- 👤 Walker Thomas
- 👤 Oughton John Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:28
CPC Classifications
C; C07; C07J; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS FOR THE SEPARATION OF 3-KETO-$4-STEROIDS SELECTED FROM THE GROUP CONSISTING OF CORTISONE, 21-MONOESTERS AND 17:21 DIESTERS THEREOF, SAID ESTERS BEING DERIVED FROM LOWER ALKANOIC ACIDS, FROM MIXTURES OF SUCH STEROIDS AND 3-KETO-4:5-DIHYDROALLOSTEROIDS SELECTED FROM THE GROUP CONSISTING OF 4:5 DIHYDROALLOCORRISONE, 21-MONOESTERS AND 17:21 DIESTERS THEREOF, SAID ESTERS BEING DERIVED FROM LOWER ALKANOIC ACIDS, IN WHICH THE SAID MIXTURES ARE REACTED WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF GIRARD REAGENT T AND GIRARD REAGENTP TOT FORM THE GIRARD DERIVATIVES OF THE RESPECTIVE KETONES, THE MIXED GIRARD DERIVATIVES ARE TREATED WITH A WATER-SOLUBLE ADLEHYDE WHICH CAN DISPLACE THE SATURATED STEROID KETONE FROM ITS GIRARD COMPLEX WHEREAFTER THE LIBERATED SATURATED KETONE IS SEPARATED FROM THE MIXTURE IN AN AQUEOUS MEDIUM, THE PH OF THE AQUEOUS MEDIUM BEING THEREAFTER LOWERED TO LIBERATE AND PRECIPITATE THE UNSATURATED KETONE.
Claim 2
Dependent Claim
137 words
A PROCESS FOR THE SEPARATION OF 3-KETO-$4-STEROIDS SELECTED FROM THE GROUP CONSISTING OF CORTISONE, 21-MONOESTERS AND 17:21 DIESTERS THEREOF, SAID ESTERS BEING DERIVED FROM LOWER ALKANOIC ACIDS, FROM MIXTURES OF SUCH STEROIDS AND 3-KETO-4:5-DIHYDROALLOSTEROIDS SELECTED FROM THE GROUP CONSISTING OF 4:5 DIHYDROALLOCORRISONE, 21-MONOESTERS AND 17:21 DIESTERS THEREOF, SAID ESTERS BEING DERIVED FROM LOWER ALKANOIC ACIDS, IN WHICH THE SAID MIXTURES ARE REACTED WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF GIRARD REAGENT T AND GIRARD REAGENTP TOT FORM THE GIRARD DERIVATIVES OF THE RESPECTIVE KETONES, THE MIXED GIRARD DERIVATIVES ARE TREATED WITH A WATER-SOLUBLE ADLEHYDE WHICH CAN DISPLACE THE SATURATED STEROID KETONE FROM ITS GIRARD COMPLEX WHEREAFTER THE LIBERATED SATURATED KETONE IS SEPARATED FROM THE MIXTURE IN AN AQUEOUS MEDIUM, THE PH OF THE AQUEOUS MEDIUM BEING THEREAFTER LOWERED TO LIBERATE AND PRECIPITATE THE UNSATURATED KETONE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |