US2565507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Degradation of dextran to produce a plasma substitute
Assignee: Tell and Usher Ltd
•
Filing: 1948-07-19
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Granted: 1951-08-28
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Expires: 1968-07-19
Abstract
No abstract record available.
Inventors
- 👤 Lockwood Arthur Ronald
- 👤 Swift Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:37
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A PROCESS OF PRODUCING DEGRADATION PRODUCTS OF DEXTRAN SUITABLE AS SUBSTITUTES FOR BLOOD PLASMA, WHICH COMPRISES TREATING A FERMENTATION PRODUCT OBTAINED BY THE ACTION OF DEXTRANPRODUCING BACTERIA ON SACCHAROSE SOLUTION WITH DILUTE MINERAL ACID AT TEMPERATURES OF 95* TO 100* C. ADJUSTING THE PH VALUE OF THE RESULTANT SOLUTION TO 7-8 BY THE ADDITION OF DILUTE ALKALI WHEREBY BACTERIAL DEBRIS IS CAUSED TO SEPARATE OUT, TREATING THE RESULTING SOLUTION OR DISPERSION TO EFFECT THE REMOVAL OF THE BULK OF THE PHOSPHATE ION BY THE ADDITION THERETO OF AN AMOUNT OF CALCIUM CHLORIDE LESS THAN THE CALCULATED AMOUNT NECESSARY TO REMOVE THE WHOLE OF THE PHOSPHATE ION PRESENT, THE PRECIPITATED CALCIUM PHOSPHATE WHICH IS FORMED SERVING AS A VEHICLE FOR REMOVING FROM THE SOLUTION A LARGE PROPORTION OF THE REMAINING ORGANIC NITROGENOUS MATTER, SEPARATING THE PRECIPITATE, AND EFFECTING THE FRACTIONAL PRECIPITATION OF THE DEGRADED DEXTRAN WITH ACETONE.
Claim 2
Dependent Claim
146 words
A PROCESS OF PRODUCING DEGRADATION PRODUCTS OF DEXTRAN SUITABLE AS SUBSTITUTES FOR BLOOD PLASMA, WHICH COMPRISES TREATING A FERMENTATION PRODUCT OBTAINED BY THE ACTION OF DEXTRANPRODUCING BACTERIA ON SACCHAROSE SOLUTION WITH DILUTE MINERAL ACID AT TEMPERATURES OF 95* TO 100* C. ADJUSTING THE PH VALUE OF THE RESULTANT SOLUTION TO 7-8 BY THE ADDITION OF DILUTE ALKALI WHEREBY BACTERIAL DEBRIS IS CAUSED TO SEPARATE OUT, TREATING THE RESULTING SOLUTION OR DISPERSION TO EFFECT THE REMOVAL OF THE BULK OF THE PHOSPHATE ION BY THE ADDITION THERETO OF AN AMOUNT OF CALCIUM CHLORIDE LESS THAN THE CALCULATED AMOUNT NECESSARY TO REMOVE THE WHOLE OF THE PHOSPHATE ION PRESENT, THE PRECIPITATED CALCIUM PHOSPHATE WHICH IS FORMED SERVING AS A VEHICLE FOR REMOVING FROM THE SOLUTION A LARGE PROPORTION OF THE REMAINING ORGANIC NITROGENOUS MATTER, SEPARATING THE PRECIPITATE, AND EFFECTING THE FRACTIONAL PRECIPITATION OF THE DEGRADED DEXTRAN WITH ACETONE.
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) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |