Patent US3829412A successfully refreshed from Google Patents.
US3829412A
Expired / Lapsed
US
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Chemically modified polysaccharides and process of preparing same
Assignee: LUNZ F AND CO Ltd
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Filing: 1970-05-15
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Granted: 1974-08-13
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Expires: 1990-05-15
Abstract
Abstract POLYSACCHARIDES CHEMICALLY REACTED IN SOLUTION WITH A BIFUNCTIONAL ETHERIFYING COMPOUNDS, SUCH AS EPICHLOROHYDRIN AND GLYCEROL DIHALIHYDRIN, TO EFFECT CROSS-LINKING AND PROVIDING A MODIFIED POLYSACCHARIDE WHICH FORMS AQUEOUS SOLUTIONS HAVING A PREDETERMINED INCREASED VISCOSITY COMPARABLE TO SOLUTIONS OF COMMERCIALLY AVAILABLE GUMS, AND SAID MODIFIED POLYSACCHARIDES PREFERABLY BEING STABILIZED AGAINST FURTHER CROSS-LINKING BY REACTING WITH A HYDROXY COMPOUND HAVING A PRIMARY HYDROXYL GROUP, SUCH AS PENTAERYTHRITOL, ETHYLENE GLYCOL AND SORBITOL; AND THE PROCESS OF PREPARING THE STABILIZING MODIFIED POLYSACCHARIDES IN AN AQUEOUS SOLUTION.
Inventors
- 👤 F Kunz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:59
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0057; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02
Claims Analysis
Total Claims: 0
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |