Patent US2798065A successfully refreshed from Google Patents.
US2798065A
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Method for isolating substantially free dextran from fermentates comprising the same
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1954-05-21
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Granted: 1957-07-02
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Expires: 1974-05-21
Abstract
No abstract record available.
Inventors
- 👤 Leo J Novak
- 👤 George S Stoycos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:43
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; C12; C12P; C12P19/00; C12P19/04; C12P19/08; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN THE ISOLATION OF NATIVE DEXTRAN FROM A NORMALLY HIGHLY VISCOUS CRUDE FERMENTATION PRODUCT CONTAINING, IN ADDITION TO THE DEXTRAN, INSOLUBLE AND NORMALLY SOLUBLE NITROGENOUS AND OTHER IMPURITIES, THE IMPROVEMENT WHICH CONSISTS IN ADDING FROM ABOUT 15% TO ABOUT 30% BY WEIGHT, BASED ON THE FERMENTATE WEIGHT, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF WATER-MISCIBLE ALIPHATIC ALCOHOLS AND KETONES TO THE FERMENTATE TO INSOLUBILIZE THE NORMALLY SOLUBLE IMPURITIES AND RENDER THE MASS RELATIVELY FLUID WITHOUT PRECIPITATING ANY APPRECIABLE QUANTITY OF THE DEXTRAN, AND THEN MECHANICALLY SEPARATING THE INSOLUBLE IMPURITIES FROM THE FERMENTATE PRIOR TO PRECIPITATING THE DEXTRAN THEREFROM.
Claim 2
Dependent Claim
100 words
IN THE ISOLATION OF NATIVE DEXTRAN FROM A NORMALLY HIGHLY VISCOUS CRUDE FERMENTATION PRODUCT CONTAINING, IN ADDITION TO THE DEXTRAN, INSOLUBLE AND NORMALLY SOLUBLE NITROGENOUS AND OTHER IMPURITIES, THE IMPROVEMENT WHICH CONSISTS IN ADDING FROM ABOUT 15% TO ABOUT 30% BY WEIGHT, BASED ON THE FERMENTATE WEIGHT, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF WATER-MISCIBLE ALIPHATIC ALCOHOLS AND KETONES TO THE FERMENTATE TO INSOLUBILIZE THE NORMALLY SOLUBLE IMPURITIES AND RENDER THE MASS RELATIVELY FLUID WITHOUT PRECIPITATING ANY APPRECIABLE QUANTITY OF THE DEXTRAN, AND THEN MECHANICALLY SEPARATING THE INSOLUBLE IMPURITIES FROM THE FERMENTATE PRIOR TO PRECIPITATING THE DEXTRAN THEREFROM.
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) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |