Patent US2500173A successfully refreshed from Google Patents.
US2500173A
Expired / Lapsed
US
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Extraction of digitalis glycosides
Assignee: University of Minnesota Twin Cities
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Filing: 1947-01-02
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Granted: 1950-03-14
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Expires: 1967-01-02
Abstract
No abstract record available.
Inventors
- 👤 Gisvold Ole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:54
CPC Classifications
A; A61; A61K; A61K36/00; A61K36/18; A61K36/185; A61K36/80
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
THE PROCESS OF PREPARING A DIGITALIS EXTRACT WHICH COMPRISES COMMINUTING IN THE PRESENCE OF WATER PLANT LEAVES CONTAINING DIGITALIS GLYCOSIDES AND SELECTED FROM THE GROUP CONSISTING OF FRESH, MOIST LEAVES PRESERVED BY QUICK FREEZING TO PRODUCE A PRELIMINARY AQUEOUS EXTRACT, HEATING THE PRELIMINARY EXTRACT TO ABOUT 60*C. TO COAGULATE THE CHLOROPHYLL AND OTHER UNDESIRED CONSTITUENTS, SEPARATING INSOLUBLE MATERIAL FROM THE CRUDE EXTRACT TO PRODUCE A LIGHT COLORED AQUEOUS EXTRACT SUBSTANTIALLY FREE OF CHLOROPHYLL.
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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |