US2500930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining rutin
Assignee: United States Department of Agriculture
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Filing: 1946-07-23
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Granted: 1950-03-21
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Expires: 1966-07-23
Abstract
No abstract record available.
Inventors
- 👤 James F Couch
- 👤 Charles F Krewson
- 👤 William L Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:08
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/06; C07H17/065; C07H17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR REMOVING SKIN-PHTOSENSITIZING IMPURITIES FROM RUTIN OBTAINED FROM BUCKWHEAT BY EXTRACTION WITH HOT AQUEOUS MEDIUM, COMPRISING: CONTACTING A BOILING SOLUTION OF THE RUTIN IN WATER WITH AN ADSORBENT TAKEN FROM THE GROUP CONSISTING OF SILICA GEL, ACTIVATED ALUMINA, INFUSORIAL EARTH, AND ACTIVATED CARBON; SEPARATING THE ADSORBENT PLUS THE ADSORBENT IMPURTIES; AND CRYSTALLIZING RUTIN FROM THE AQUEOUS SOLUTION.
Claim 2
Dependent Claim
59 words
A PROCESS FOR REMOVING SKIN-PHTOSENSITIZING IMPURITIES FROM RUTIN OBTAINED FROM BUCKWHEAT BY EXTRACTION WITH HOT AQUEOUS MEDIUM, COMPRISING: CONTACTING A BOILING SOLUTION OF THE RUTIN IN WATER WITH AN ADSORBENT TAKEN FROM THE GROUP CONSISTING OF SILICA GEL, ACTIVATED ALUMINA, INFUSORIAL EARTH, AND ACTIVATED CARBON; SEPARATING THE ADSORBENT PLUS THE ADSORBENT IMPURTIES; AND CRYSTALLIZING RUTIN FROM THE AQUEOUS SOLUTION.
References Cited (Backward Citations)
US1849576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |