US2989525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of sapogenins
Assignee: Glaxo Laboratories Ltd
•
Filing: 1959-11-09
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Granted: 1961-06-20
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Expires: 1979-11-09
Abstract
No abstract record available.
Inventors
- 👤 Wilkins Frederick James
- 👤 Holt Thomas Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:50
CPC Classifications
A; A61; A61K; A61K36/00; A61K36/18; A61K36/88; A61K36/896
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR SEPARATING SOLID HECOGENIN-CONTAINING MATERIAL FROM A DIFFICULTY SEPARABLE AQUEOUS SLURRY OBTAINED BY THE AUTOLYSIS OF HECONIN-CONTAINING PLANT SAP, COMPRISING AUTOCLAVING SAID SLURRY AT APPROXIMATELY ITS NATURAL PH AND AT A TEMPERATURE OF ABOUT 140*C.-250*C. FOR A TIME SUFFICIENT TO EFFECT HYDROLYSIS OF A SUBSTANTIAL PROPORTION OF SAID HECONIN TO HECOGENIN AND FORM A MIXTURE FROM WHICH THE RESULTING SOLID HECOGENIN-CONTAINING MATERIAL IS READILY SEPARABLE, AND SEPARATING SAID SOLID FROM SAID MIXTURE.
Claim 2
Dependent Claim
74 words
A PROCESS FOR SEPARATING SOLID HECOGENIN-CONTAINING MATERIAL FROM A DIFFICULTY SEPARABLE AQUEOUS SLURRY OBTAINED BY THE AUTOLYSIS OF HECONIN-CONTAINING PLANT SAP, COMPRISING AUTOCLAVING SAID SLURRY AT APPROXIMATELY ITS NATURAL PH AND AT A TEMPERATURE OF ABOUT 140*C.-250*C. FOR A TIME SUFFICIENT TO EFFECT HYDROLYSIS OF A SUBSTANTIAL PROPORTION OF SAID HECONIN TO HECOGENIN AND FORM A MIXTURE FROM WHICH THE RESULTING SOLID HECOGENIN-CONTAINING MATERIAL IS READILY SEPARABLE, AND SEPARATING SAID SOLID FROM SAID MIXTURE.
References Cited (Backward Citations)
GB728961A
Cited
US2827456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |