Patent US2839544A successfully refreshed from Google Patents.
US2839544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countercurrent extraction of steroids
Assignee: Pharmacia and Upjohn Co
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Filing: 1956-09-04
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Granted: 1958-06-17
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 John W Greiner
- 👤 Glen A Fevig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:02
CPC Classifications
C; C07; C07J; C07J1/00; C07J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR THE SEPARATION AND PURIFICATION OF STIGMASTEROL AND SITOSTEROLS BY THE EXTRACTION OF SITOSTEROLS FROM A STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE CONSISTING ESSENTIALLY OF STIGMASTEROL AND SITOSTEROLS, WHICH COMPRISES CONTACTING THE STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE WITH A SELECTIVE ORGANIC SOLVENT HAVING THE FOLLOWING CHARACTERISTICS, (1) A GREATER SOLVENT AFFINITY FOR THE SITOSTEROLS AS DETERMINED ON A TEST PORTION OF SAID STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE BY EMPLOYING A VOLUME OF THE ORGANIC SOLVENT WHICH DISSOLVES APPROXIMATELY ONE-HALF OF THE SOLIDS OF THE TEST PORTION OF THE SAID STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE, AND (2) A RELATIVE DISTRIBUTION COEFFICIENT (B) IN SAID TEST GREATER THAN 1.5, SAID RELATIVE DISTRIBUTION COEFFICIENT (B) BEING DETERMINED ACCORDING TO THE FORMULA:
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE SEPARATION AND PURIFICATION OF STIGMASTEROL AND SITOSTEROLS BY THE EXTRACTION OF SITOSTEROLS FROM A STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE CONSISTING ESSENTIALLY OF STIGMASTEROL AND SITOSTEROLS, WHICH COMPRISES CONTACTING THE STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE WITH A SELECTIVE ORGANIC SOLVENT HAVING THE FOLLOWING CHARACTERISTICS, (1) A GREATER SOLVENT AFFINITY FOR THE SITOSTEROLS AS DETERMINED ON A TEST PORTION OF SAID STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE BY EMPLOYING A VOLUME OF THE ORGANIC SOLVENT WHICH DISSOLVES APPROXIMATELY ONE-HALF OF THE SOLIDS OF THE TEST PORTION OF THE SAID STARTING SOLID STIGMASTEROL AND SITOSTEROLS MIXTURE, AND (2) A RELATIVE DISTRIBUTION COEFFICIENT (B) IN SAID TEST GREATER THAN 1.5, SAID RELATIVE DISTRIBUTION COEFFICIENT (B) BEING DETERMINED ACCORDING TO THE FORMULA:
References Cited (Backward Citations)
US2508220A
Cited
US2772297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |