US2963494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of sterols
Assignee: Pharmacia and Upjohn Co
•
Filing: 1957-12-16
•
Granted: 1960-12-06
•
Expires: 1977-12-16
Abstract
No abstract record available.
Inventors
- 👤 Fay L Cunningham
- 👤 Kenneth W Riebe
- 👤 Greiner John Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:56
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; C; C07; C07J; C07J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A PROCESS FOR PRODUCING PURIFIED STEROL WHICH COMPRISES PROVIDING A SOLUTION OF A CRUDE STEROL MIXTURE CONTAINING NOT MORE THAN 20 PERCENT BY WEIGHT OF IMPURITIES, SAID IMPURITIES COMPRISING NON-STEROL MATTER, IN A SOLVENT COMPRISING A MIXTURE OF A HALOGENATED ALIPHATIC HYDROCARBON CONTAINING FROM ONE TO FOUR CARBON ATOMS, INCLUSIVE, AND AN ALIPHATIC HYDROCARBON CONTAINING FROM FIVE TO EIGHT CARBON ATOMS, INCLUSIVE, IN THE PROPORTION OF THIRTY TO SIXTY PERCENT BY WEIGHT OF SAID STEROL MIXTURE, ADJUSTING THE TEMPERATURE OF SAID SOLUTION TO AT LEAST FIFTY DEGREES CENTRIGRADE, ADDING WATER THERETO IN A RANGE OF 0.9 TO 2.0 PERCENT, BASED ON THE WEIGHT OF DISSOLVED SOLIDS, COOLING THE RESULTING MIXTURE TO A TEMPERATURE WITHIN THE RANGE OF 35 DEGREES CENTIGRADE TO MINUS TEN DEGREES CENTIGRADE, THUS TO FORM RELATIVELY FINE CRYSTALS OF SAID DTEROL, SEPARATING SAID CRYSTALS FROM THE SOLVENT MIXTURE, AND SEPARATING FURTHER IMPURITIES FROM SAID CRYSTALS BY CONTACTING THEM WITH AN ALIPHATIC HYDROCARBON, AS DEFINED ABOVE.
Claim 2
Dependent Claim
158 words
A PROCESS FOR PRODUCING PURIFIED STEROL WHICH COMPRISES PROVIDING A SOLUTION OF A CRUDE STEROL MIXTURE CONTAINING NOT MORE THAN 20 PERCENT BY WEIGHT OF IMPURITIES, SAID IMPURITIES COMPRISING NON-STEROL MATTER, IN A SOLVENT COMPRISING A MIXTURE OF A HALOGENATED ALIPHATIC HYDROCARBON CONTAINING FROM ONE TO FOUR CARBON ATOMS, INCLUSIVE, AND AN ALIPHATIC HYDROCARBON CONTAINING FROM FIVE TO EIGHT CARBON ATOMS, INCLUSIVE, IN THE PROPORTION OF THIRTY TO SIXTY PERCENT BY WEIGHT OF SAID STEROL MIXTURE, ADJUSTING THE TEMPERATURE OF SAID SOLUTION TO AT LEAST FIFTY DEGREES CENTRIGRADE, ADDING WATER THERETO IN A RANGE OF 0.9 TO 2.0 PERCENT, BASED ON THE WEIGHT OF DISSOLVED SOLIDS, COOLING THE RESULTING MIXTURE TO A TEMPERATURE WITHIN THE RANGE OF 35 DEGREES CENTIGRADE TO MINUS TEN DEGREES CENTIGRADE, THUS TO FORM RELATIVELY FINE CRYSTALS OF SAID DTEROL, SEPARATING SAID CRYSTALS FROM THE SOLVENT MIXTURE, AND SEPARATING FURTHER IMPURITIES FROM SAID CRYSTALS BY CONTACTING THEM WITH AN ALIPHATIC HYDROCARBON, AS DEFINED ABOVE.
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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |