Patent US2775540A successfully refreshed from Google Patents.
US2775540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dextran
Assignee: Amstar Corp
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Filing: 1950-12-18
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Granted: 1956-12-25
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Expires: 1970-12-18
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Wimmer
- 👤 George D Lakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:49
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/04; C12P19/08; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE IMPROVEMENT IN THE PRODUCTION OF DEXTRAN FROM SUCROSE BY LEUCONOSTOC FERMENTATION WHICH COMPRISES CARRYING OUT THE FERMENTATION IN A CULTURE MEDIUM MADE OF PASTEURIZED, FRESHLY PREPARED YEAST BEAR TO WHICH SUCROSE AND THE LEUCONOSTOC CULTURE ARE ADDED.
Claim 2
Dependent Claim
38 words
THE IMPROVEMENT IN THE PRODUCTION OF DEXTRAN FROM SUCROSE BY LEUCONOSTOC FERMENTATION WHICH COMPRISES CARRYING OUT THE FERMENTATION IN A CULTURE MEDIUM MADE OF PASTEURIZED, FRESHLY PREPARED YEAST BEAR TO WHICH SUCROSE AND THE LEUCONOSTOC CULTURE ARE ADDED.
References Cited (Backward Citations)
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US2203703A
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US2223501A
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US2310263A
Cited
US2392258A
Cited
US2483855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |