US2905677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counter current extraction process of sterols
Assignee: Pharmacia and Upjohn Co
•
Filing: 1957-05-02
•
Granted: 1959-09-22
•
Expires: 1977-05-02
Abstract
No abstract record available.
Inventors
- 👤 Glen A Fevig
- 👤 John W Greiner
- 👤 Kenneth W Riebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:52
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; C; C07; C07J; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN 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 HAAVING THE FOLLOWING CHARACTERISTIC; (1) A GREATER SOLVENT AFFINITY FOR THE SITEISTEROLS 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 (!) IN SAID TEST GREATER THAN 1.5, SAID RELATIVE DISTRIBUTION COEFFICIENT (B) BEING DETERMINED ACCORDING TO THE FORMULA:
Claim 2
Dependent Claim
124 words
IN 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 HAAVING THE FOLLOWING CHARACTERISTIC; (1) A GREATER SOLVENT AFFINITY FOR THE SITEISTEROLS 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 (!) IN SAID TEST GREATER THAN 1.5, SAID RELATIVE DISTRIBUTION COEFFICIENT (B) BEING DETERMINED ACCORDING TO THE FORMULA:
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |