US2827456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purification of hecogenin
Assignee: Glaxo Laboratories Ltd
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Filing: 1956-02-15
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Granted: 1958-03-18
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Expires: 1976-02-15
Abstract
No abstract record available.
Inventors
- 👤 Holt Thomas Eric
- 👤 Clayton John Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:18
CPC Classifications
C; C07; C07J; C07J71/00; C07J75/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PURFICATION OF CRUDE WAX-CONTAIN ING HECOGENIN OBTAINED DIRECTLY FROM THE HYDROLYSIS OF THE CORRESPONDING NATURALLY-OCCURRING PLANT SAPONIN, COMPRISING CONTACTING SAID CRUDE HECOGENIN WITH AN ALCOHOL CONTAINING 1-5 CARBON ATOMS TO FORM A SOLUTION CONTAINING HECOGENIN AND WAX AND HAVING SOLIDS SUSPENDED THEREIN, SEPARATING THE SUSPENDED SOLIDS FROM THE SOLUTION, EVAPORATING THE SOLUTION TO DRYNESS, EXTRACTING WAX WITH A COLD HYDROCARBON SOLVENT FROM THE RESULTING DRY MATERIAL, DISSOLVING THE REMAINING WAX-FREE MATERIAL IN AN ALCOHOL CONTAINING 1-5 CARBON ATOMS AND CRYSTALLISING HECOGENIN OF INCREASED PURITY FROM THE LAST-FORMED SOLUTION.
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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |