US2534260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digitalis extraction
Assignee: University of Minnesota Twin Cities
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Filing: 1949-06-23
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Granted: 1950-12-19
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Expires: 1969-06-23
Abstract
No abstract record available.
Inventors
- 👤 Gisvold Ole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:42
CPC Classifications
A; A61; A61K; A61K36/00; A61K36/18; A61K36/185; A61K36/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE PROCESS OF PREPARING DIGITALIS GLYCOSIDES WHICH COMPRISES COMMINUTING PLANT MATERIAL CONTAINING DIGITALIS AND SELECTED FROM THE GROUP CONSISTING OF FRESH, MOIST PLANT MATERIAL AND SUCH MATERIAL PRESERVED BY QUICK-FREEZING UNTIL AT LEAST MOST OF THE PLANT CELLS CONTAINING THE DIGITAILS GLYCOSIDES ARE RUPTURED, EXTRACTING THE DISINTEGRATED PLANT MATERIAL WITH WATER TO PRODUCE A PRELIMINARY AQUEOUS EXTACT, HEATING THE PRELIMINARY EXTRACT TO ABOUT 60*C. TO COAGULATE THE CHLOROPHYLL AND OTHER UNDESIRED CONSTITUENTS, SEPARATING INSOLUBLE MATERIAL FROM THE PRELIMINARY EXTRACT SUBSTANTIALLY FREE FROM CHLOROPHYLL, EXTRACTING THE AQUEOUS EXTRACT WITH A WATER IMMISCIBLE LOW ALIPHATIC KETONE SOLVENT FOR THE DIGITALIS GLYCOSIDES AND SEPARATING THE DIGITALIS GLYCOSIDES FROM THE KETONE SOLVENT.
Claim 2
Dependent Claim
108 words
THE PROCESS OF PREPARING DIGITALIS GLYCOSIDES WHICH COMPRISES COMMINUTING PLANT MATERIAL CONTAINING DIGITALIS AND SELECTED FROM THE GROUP CONSISTING OF FRESH, MOIST PLANT MATERIAL AND SUCH MATERIAL PRESERVED BY QUICK-FREEZING UNTIL AT LEAST MOST OF THE PLANT CELLS CONTAINING THE DIGITAILS GLYCOSIDES ARE RUPTURED, EXTRACTING THE DISINTEGRATED PLANT MATERIAL WITH WATER TO PRODUCE A PRELIMINARY AQUEOUS EXTACT, HEATING THE PRELIMINARY EXTRACT TO ABOUT 60*C. TO COAGULATE THE CHLOROPHYLL AND OTHER UNDESIRED CONSTITUENTS, SEPARATING INSOLUBLE MATERIAL FROM THE PRELIMINARY EXTRACT SUBSTANTIALLY FREE FROM CHLOROPHYLL, EXTRACTING THE AQUEOUS EXTRACT WITH A WATER IMMISCIBLE LOW ALIPHATIC KETONE SOLVENT FOR THE DIGITALIS GLYCOSIDES AND SEPARATING THE DIGITALIS GLYCOSIDES FROM THE KETONE SOLVENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |