Patent US2709150A successfully refreshed from Google Patents.
US2709150A
Expired / Lapsed
US
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Method of producing dextran material by bacteriological and enzymatic action
Assignee: ENZMATIC CHEMICALS Inc
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Filing: 1951-08-09
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Granted: 1955-05-24
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Expires: 1971-08-09
Abstract
No abstract record available.
Inventors
- 👤 Virginia W Carlson
- 👤 Warner W Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:23
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/24; C12N9/2402; C12N9/2405; C12N9/2451; C12N9/2454; C12P; C12P19/00; C12P19/04; C12P19/08; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/913; Y10S435/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A METHOD OF PRODUCING DEXTRAN OF RELATIVELY LOW MOLECULAR WEIGHT FROM DEXTRAN OF RELATIVELY HIGH MOLECULAR WEIGHT, THE STEPS OF (A) INTRODUCING INTO AN AQUEOUS MEDIUM CONTAINING THE DEXTRAN OF RELATIVELY HIGH MOLECULAR WEIGHT A "LIMIT" ENDO-DEXTRANASE PRODUCED BY ASPERGILLUS WENTII, SAID "LIMIT" ENDO-DEXTRANASE BEING CHARACTERIZED IN THAT (1) IT INITIALLY AND PREFERENTIALLY ATTACKS GLUCOSIDIC LINKAGES DEEP WITHIN THE RELATIVELY LARGE DEXTRAN MOLECULES, (2) IT SPLITS THE LARGE DEXTRAN MOLECULES INTO SEGMENTS HAVING A SUBSTANTIALLY UNIFORM AND PREDETERMINABLE SIZE BETWEEN THE INITIAL SIZE OF THE LARGE MOLECULES AND A SMALLER SIZE CORRESPONDING TO A MOLECULAR WEIGHT NOT APPRECIABLY LOWER THAN ABOUT 20,000, (3) IT EXHIBITS LITTLE CAPACITY TO SPLIT THE DEXTRAN INTO SEGMENTS OF MOLECULAR WEIGHT SUBSTANTIALLY LOWER THAN ABOUT 20,000, AND (4) THE PLOT OF THE RECIPROCAL OF THE NATURAL LOGARITHM OF THE RELATIVE VISCOSITY
Claim 2
Dependent Claim
137 words
IN A METHOD OF PRODUCING DEXTRAN OF RELATIVELY LOW MOLECULAR WEIGHT FROM DEXTRAN OF RELATIVELY HIGH MOLECULAR WEIGHT, THE STEPS OF (A) INTRODUCING INTO AN AQUEOUS MEDIUM CONTAINING THE DEXTRAN OF RELATIVELY HIGH MOLECULAR WEIGHT A "LIMIT" ENDO-DEXTRANASE PRODUCED BY ASPERGILLUS WENTII, SAID "LIMIT" ENDO-DEXTRANASE BEING CHARACTERIZED IN THAT (1) IT INITIALLY AND PREFERENTIALLY ATTACKS GLUCOSIDIC LINKAGES DEEP WITHIN THE RELATIVELY LARGE DEXTRAN MOLECULES, (2) IT SPLITS THE LARGE DEXTRAN MOLECULES INTO SEGMENTS HAVING A SUBSTANTIALLY UNIFORM AND PREDETERMINABLE SIZE BETWEEN THE INITIAL SIZE OF THE LARGE MOLECULES AND A SMALLER SIZE CORRESPONDING TO A MOLECULAR WEIGHT NOT APPRECIABLY LOWER THAN ABOUT 20,000, (3) IT EXHIBITS LITTLE CAPACITY TO SPLIT THE DEXTRAN INTO SEGMENTS OF MOLECULAR WEIGHT SUBSTANTIALLY LOWER THAN ABOUT 20,000, AND (4) THE PLOT OF THE RECIPROCAL OF THE NATURAL LOGARITHM OF THE RELATIVE VISCOSITY
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |