US2790720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Food preservation
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1953-12-18
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Granted: 1957-04-30
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Expires: 1973-12-18
Abstract
No abstract record available.
Inventors
- 👤 Leo J Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:56
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/70; A23B2/725; A23B2/729; A23B2/7295; A23L; A23L29/00; A23L29/20; A23L29/269; A23L29/273
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF PRESERVING FOOD WHICH COMPRISES THE STEP OF CONTACTING THE FOOD WITH A MEDIUM CONSISTING ESSENTIALLY OF AN AQUEOUS DISPERSION OF DEXTRAN CONTAINING FROM ABOUT 1-2 PARTS PER MILLION PARTS OF THE DISPERSION TO 1-2 PARTS PER MILLION PARTS OF THE DISPERSION ANTIBIOTIC, SAID DEXTRAN HAVING A MOLECULAR WEIGHT BEBETWEEN 5000 AND THAT OF NATIVE, UNHYDROLYZED DEXTRAN.
Claim 2
Independent Claim
59 words
THE METHOD OF PRESERVING FOOD WHICH COMPRISES THE STEP OF CONTACTING THE FOOD WITH A MEDIUM CONSISTING ESSENTIALLY OF AN AQUEOUS DISPERSION OF DEXTRAN CONTAINING FROM ABOUT 1-2 PARTS PER MILLION PARTS OF THE DISPERSION TO 1-2 PARTS PER MILLION PARTS OF THE DISPERSION ANTIBIOTIC, SAID DEXTRAN HAVING A MOLECULAR WEIGHT BEBETWEEN 5000 AND THAT OF NATIVE, UNHYDROLYZED DEXTRAN.
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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |