US2685579A
Expired / Lapsed
US
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Fractionation of dextrans with alkaline earth hydroxides
Assignee: Amstar Corp
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Filing: 1951-05-14
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Granted: 1954-08-03
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Expires: 1971-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Wimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:55
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/911; Y10S435/94; Y10S435/942
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
THE METHOD OF EFFECTING THE FRACTIONAL SEPARATION OF MIXTURES OF DEXTRANS OF VARIOUS MOLECULAR SIZES WHICH COMPRISES REACTING A SOLUTION CONTAINING SUCH DEXTRANS AS ITS PRINCIPAL CONSTITUENTS, AND WHICH SOLUTION IS FREE FROM SUGAR, WITH AN ALKALINE EARTH HYDROXIDE AND FORMING AN AQUEOUS REACTION MIXTURE CONTAINING PART OF THE DEXTRANS AS INSOLUBLE ALKALINE EARTH HYDROXIDE COMPLEXES AND PART OF THE DEXTRANS IN SOLUTION, AND SEPARATING THE SOLUTION FROM THE INSOLUBLE COMPLEXES.
Claim 2
Independent Claim
71 words
THE METHOD OF EFFECTING THE FRACTIONAL SEPARATION OF MIXTURES OF DEXTRANS OF VARIOUS MOLECULAR SIZES WHICH COMPRISES REACTING A SOLUTION CONTAINING SUCH DEXTRANS AS ITS PRINCIPAL CONSTITUENTS, AND WHICH SOLUTION IS FREE FROM SUGAR, WITH AN ALKALINE EARTH HYDROXIDE AND FORMING AN AQUEOUS REACTION MIXTURE CONTAINING PART OF THE DEXTRANS AS INSOLUBLE ALKALINE EARTH HYDROXIDE COMPLEXES AND PART OF THE DEXTRANS IN SOLUTION, AND SEPARATING THE SOLUTION FROM THE INSOLUBLE COMPLEXES.
References Cited (Backward Citations)
US2565507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |