US3734828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation and purification of riboflavinyl glycosides
Assignee: Nagase Viita Co Ltd
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Filing: 1971-03-31
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Granted: 1973-05-22
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Expires: 1991-03-31
Abstract
Abstract PROCESS FOR RECOVERING AND PURIFYING RIBOFLAVINYL GLYCOSIDES WHICH ARE PRODUCED BY SUBJECTING TRANSGLUCOSIDASE TO A MIXTURE SOLUTION OF CARBOHYDRATES AND RIBOFLAVIN WHICH COMPRISES CRYSTALLIXING RIBOFLAVIN BY MEANS OF REDUCTION CONCENTRATION THEREBY REMOVING THE CRYSTALLIZED RIBOFLAVIN, ADDING HYDROSULFITE TO THE CRYSTALLIZED RIBOFLAVIN TO GIVE REDUCED RIBOFLAVINYL GLUCOSIDES IN CRYSTAL FORMS, SEPARATING THE PRRODUCT FROM THE SUGARS, PASSING THE RESULTING PRRODUCT THROUGH ACIDIC- AND MODERATELY BASIC ION EXCHANGE RESINS THEREBY REMOVING IMPURITIES, THEN CONCENTRATING AND CRYSTALLIZING THE RESULTING PRODUCT.
Inventors
- 👤 T Miyake
- 👤 Y Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:43
CPC Classifications
C; C12; C12P; C12P25/00; C07; C07D; C07D475/00; C07D475/12; C07D475/14; Y; Y10; Y10S; Y10S435/00; Y10S435/803
Claims Analysis
Total Claims: 0
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |