Patent US2689848A successfully refreshed from Google Patents.
US2689848A
Expired / Lapsed
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Salts of sulfuric acid esters of xylan
Assignee: Wander AG
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Filing: 1952-02-05
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Granted: 1954-09-21
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Expires: 1972-02-05
Abstract
No abstract record available.
Inventors
- 👤 Husemann Elfriede
- 👤 Westphal Otto
- 👤 Kickhofen Botho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:23
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN A PROCESS FOR THE PRODUCTION OF SALTS OF SULFURIC ACID ESTERS OF XYLAN HAVING HIGH ANTICOAGULANT ACTION ON BLOOD AND LOW TOXICITY, THE STEPS WHICH COMPRISE OXIDIZING AN AQUEOUS SOLUTION OF A SALT OF A SULFURIC ACID ESTER OF HIGHLY POLYMERIC XYLAN IN AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE TO DEPOLYMERIZE SUCH HIGHLY POLYMERIC XYLAN ESTER PARTIALLY, DIALYZING THE DEPOLYMERIZED PRODUCT AND FRACTIONATING AN AQUEOUS SOLUTION OF THE DIALYZATE WITH AN ORGANIC WATER MISICBLE SOLVENT TO OBTAIN A FRACTION HAVING A ZN VALUE BETWEEN 0.0030 AND 0.015 AND A SULFUR CONTENT OF 13.5% TO 17%.
Claim 2
Dependent Claim
96 words
IN A PROCESS FOR THE PRODUCTION OF SALTS OF SULFURIC ACID ESTERS OF XYLAN HAVING HIGH ANTICOAGULANT ACTION ON BLOOD AND LOW TOXICITY, THE STEPS WHICH COMPRISE OXIDIZING AN AQUEOUS SOLUTION OF A SALT OF A SULFURIC ACID ESTER OF HIGHLY POLYMERIC XYLAN IN AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE TO DEPOLYMERIZE SUCH HIGHLY POLYMERIC XYLAN ESTER PARTIALLY, DIALYZING THE DEPOLYMERIZED PRODUCT AND FRACTIONATING AN AQUEOUS SOLUTION OF THE DIALYZATE WITH AN ORGANIC WATER MISICBLE SOLVENT TO OBTAIN A FRACTION HAVING A ZN VALUE BETWEEN 0.0030 AND 0.015 AND A SULFUR CONTENT OF 13.5% TO 17%.
References Cited (Backward Citations)
US2076889A
Cited
GB603571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |