Patent US2681907A successfully refreshed from Google Patents.
US2681907A
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Isolation of flavonoid compounds
Assignee: United States Atomic Energy Commission
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Filing: 1952-04-22
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Granted: 1954-06-22
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Expires: 1972-04-22
Abstract
No abstract record available.
Inventors
- 👤 Simon H Wender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:17
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/335; A61K31/35
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
AN IMPROVED METHOD OF SEPARATING FLAVONOIDS FROM AN AQUEOUS SOLUTION CONTAINING SAID FLAVONOIDS AND EXTRANEOUS IMPURITIES WHICH COMPRISES CONTACTING SAID AQUEOUS SOLUTION WITH A COMMINUTED CATION-EXCHANGE RESIN, SEPARATING THE RESULTING FLAVONIOD-DEPLETED SOLUTION FROM THE RESULTING FLAVONOID-RETAINING RESIN AND ELUTING THE FLAVONOIDS FROM SAID RESIN WITH AN ORGANIC SOLVENT.
Claim 2
Dependent Claim
48 words
AN IMPROVED METHOD OF SEPARATING FLAVONOIDS FROM AN AQUEOUS SOLUTION CONTAINING SAID FLAVONOIDS AND EXTRANEOUS IMPURITIES WHICH COMPRISES CONTACTING SAID AQUEOUS SOLUTION WITH A COMMINUTED CATION-EXCHANGE RESIN, SEPARATING THE RESULTING FLAVONIOD-DEPLETED SOLUTION FROM THE RESULTING FLAVONOID-RETAINING RESIN AND ELUTING THE FLAVONOIDS FROM SAID RESIN WITH AN ORGANIC 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) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |