US2715091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dextran sulfate as anticoagulant, process of preparing same, and sterile solution thereof
Assignee: National Research Development Corp UK
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Filing: 1950-11-18
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Granted: 1955-08-09
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Expires: 1970-11-18
Abstract
No abstract record available.
Inventors
- 👤 Ricketts Colin Robert
- 👤 Walton Kenneth Walter Wi Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:46
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR PREPARING NON-TOXIC ANTICOAGULANTS FOR USE WITH BLOOD AND PLASMA, COMPRISING ESTERIFYING A DEXTRAN HAVING AN INTRINSIC VISCOSITY OF LESS THAN 0.12 BUT NOT LOWER THAN 0.02 WITH A SULPHATING AGENT TO FORM A SULPHURIC ACID ESTER, THE SULPHUR CONTENT OF WHICH, CALCULATED ON ITS SODIUM SALT, IS MORE THAN 9 PER CENT, AND CONVERTING SUCH ESTER INTO A WAER-SOLUBLE SALT.
Claim 2
Dependent Claim
63 words
A PROCESS FOR PREPARING NON-TOXIC ANTICOAGULANTS FOR USE WITH BLOOD AND PLASMA, COMPRISING ESTERIFYING A DEXTRAN HAVING AN INTRINSIC VISCOSITY OF LESS THAN 0.12 BUT NOT LOWER THAN 0.02 WITH A SULPHATING AGENT TO FORM A SULPHURIC ACID ESTER, THE SULPHUR CONTENT OF WHICH, CALCULATED ON ITS SODIUM SALT, IS MORE THAN 9 PER CENT, AND CONVERTING SUCH ESTER INTO A WAER-SOLUBLE SALT.
References Cited (Backward Citations)
US2284566A
Cited
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US2437518A
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GB603571A
Cited
US2506294A
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US2508433A
Cited
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Cited
US2565507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-08 | 1959-02-07 | 1959-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-08 | 1963-02-07 | 1963-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-08 | 1967-02-07 | 1967-08-09 | $7700.00 | Window Closed / Lapsed |