US2719845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation of sapogenins
Assignee: Individual
•
Filing: 1952-12-02
•
Granted: 1955-10-04
•
Expires: 1972-12-02
Abstract
No abstract record available.
Inventors
- 👤 Monroe E Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
C; C07; C07J; C07J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR PURIFYING A CRUDE STEROIDAL SAPOGENIN SELECTED FROM THE GROUP CONSISTING OF SARSASAPOGENIN, HECOGENIN, MANOGENIN AMD MIXTURES THEREOF, COMPRISING ACETYLATING THE CRUDE STEROIDAL SAPOGENIN BY BOILING IT AT ATMOSPHERIC PRESSURE WITH A SUBSTANTIAL EXCESS OF ACETIC ANHYDRIDE, EXTRACTING THE RESULTING SAPOGENIN ACETATE FROM THE EXCESS ACETIC ANHYDRIDE AND IMPURITIES PRESENT THEREIN BY CONTACTING THE ACETYLATION REACTION MIXTURE WITH A LIQUID HYDROCARBON SOLVENT WHICH IS A SOLVENT FOR THE SAPOGENIN ACETATE, WHICH IS IMMISCIBLE WITH THE ACETIC ANHYDRIDE, AND WHICH CONSISTS OF AT LEAST ABOUT 80% OF ALIPHATIC HYDROCARBONS CONTAINING 5 TO 8 CARBON ATOMS AND NOT MORE THAN ABOUT 20% OF AN AROMATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF BENZENE AND TOLUENE, AND SEPARATING THE SAPOGENIN ACETATE FROM SAID SOLVENT.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PURIFYING A CRUDE STEROIDAL SAPOGENIN SELECTED FROM THE GROUP CONSISTING OF SARSASAPOGENIN, HECOGENIN, MANOGENIN AMD MIXTURES THEREOF, COMPRISING ACETYLATING THE CRUDE STEROIDAL SAPOGENIN BY BOILING IT AT ATMOSPHERIC PRESSURE WITH A SUBSTANTIAL EXCESS OF ACETIC ANHYDRIDE, EXTRACTING THE RESULTING SAPOGENIN ACETATE FROM THE EXCESS ACETIC ANHYDRIDE AND IMPURITIES PRESENT THEREIN BY CONTACTING THE ACETYLATION REACTION MIXTURE WITH A LIQUID HYDROCARBON SOLVENT WHICH IS A SOLVENT FOR THE SAPOGENIN ACETATE, WHICH IS IMMISCIBLE WITH THE ACETIC ANHYDRIDE, AND WHICH CONSISTS OF AT LEAST ABOUT 80% OF ALIPHATIC HYDROCARBONS CONTAINING 5 TO 8 CARBON ATOMS AND NOT MORE THAN ABOUT 20% OF AN AROMATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF BENZENE AND TOLUENE, AND SEPARATING THE SAPOGENIN ACETATE FROM SAID SOLVENT.
References Cited (Backward Citations)
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Cited
US2289373A
Cited
US2352852A
Cited
US2408827A
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US2408835A
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US2408834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |