Patent US2727889A successfully refreshed from Google Patents.
US2727889A
Expired / Lapsed
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Fractionation of alginic acid sulfate
Assignee: Wyeth LLC
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Filing: 1951-04-19
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Granted: 1955-12-20
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Expires: 1971-04-19
Abstract
No abstract record available.
Inventors
- 👤 Harvey E Alburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:52
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE METHOD OF SELECTIVELY PRECIPITATING MOLECULARWEIGHT FRACTIONS OF PARTIALLY DEPOLYMERIZED ALGINIC ACID SULFATE SALTS FROM THEIR AQUEOUS SOLUTIONS WHICH COMPRISES ADDING TO SAID SOLUTIONS PORTIONS OF A NEUTRAL WATERMISCIBLE ORGANIC LIQUID PRECIPITANT CONTAINING OXYGEN IN A NON-ESTER TYPE OF LINKAGE, IN WHICH SAID SALT IS SUBSTANTIALLY INSOLUBLE, AND SEPARATELY COLLECTING SAID FRACTIONS.
Claim 2
Independent Claim
52 words
THE METHOD OF SELECTIVELY PRECIPITATING MOLECULARWEIGHT FRACTIONS OF PARTIALLY DEPOLYMERIZED ALGINIC ACID SULFATE SALTS FROM THEIR AQUEOUS SOLUTIONS WHICH COMPRISES ADDING TO SAID SOLUTIONS PORTIONS OF A NEUTRAL WATERMISCIBLE ORGANIC LIQUID PRECIPITANT CONTAINING OXYGEN IN A NON-ESTER TYPE OF LINKAGE, IN WHICH SAID SALT IS SUBSTANTIALLY INSOLUBLE, AND SEPARATELY COLLECTING SAID FRACTIONS.
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) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |