Patent US2686778A successfully refreshed from Google Patents.
US2686778A
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Treatment of dextran
Assignee: Amstar Corp
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Filing: 1952-04-23
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Granted: 1954-08-17
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Expires: 1972-04-23
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Wimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:26
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF TREATING DEXTRANS WHICH COMPRISES REACTING THE DEXTRAN IN AQUEOUS SOLUTION WITH AN ALKALINE EARTH METAL HYDROXIDE IN AMOUNT SUFFICIENT TO PRECIPITATE SUBSTANTIALLY ALL OF THE DEXTRAN AS AN ALKALINE EARTH HYDROXIDE-DEXTRAN COMPLEX, SUBJECTING SUCH COMPLEX TO ALKALI TREAT MENT FOR A SUFFICIENT PERIOD OF TIME TO EFFECT A SUBSTANITAL REDUCTION IN THE VISCOSITY AND MOLECULAR WEIGHT OF THE DEXTRAN, AND FREEING THE DEXTRAN FROM SUCH ALKALINE TREATMENT WITH AN ACID TO FORM AN ALKALINE EARTH SALT OF SUCH ACID.
Claim 2
Independent Claim
82 words
THE METHOD OF TREATING DEXTRANS WHICH COMPRISES REACTING THE DEXTRAN IN AQUEOUS SOLUTION WITH AN ALKALINE EARTH METAL HYDROXIDE IN AMOUNT SUFFICIENT TO PRECIPITATE SUBSTANTIALLY ALL OF THE DEXTRAN AS AN ALKALINE EARTH HYDROXIDE-DEXTRAN COMPLEX, SUBJECTING SUCH COMPLEX TO ALKALI TREAT MENT FOR A SUFFICIENT PERIOD OF TIME TO EFFECT A SUBSTANITAL REDUCTION IN THE VISCOSITY AND MOLECULAR WEIGHT OF THE DEXTRAN, AND FREEING THE DEXTRAN FROM SUCH ALKALINE TREATMENT WITH AN ACID TO FORM AN ALKALINE EARTH SALT OF SUCH ACID.
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) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |