US3077468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insolubilization of polysaccharide ethers
Assignee: Hercules Powder Co
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Filing: 1960-12-22
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Granted: 1963-02-12
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Expires: 1980-12-22
Abstract
No abstract record available.
Inventors
- 👤 Robert M Geurden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:44
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08; C08B11/20; C08B15/00; C08B15/005; C08B31/00; C08B31/003; C08B31/006; D; D06; D06M; D06M15/00; D06M15/01; D06M15/03; D06M15/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
PROCESS FOR REDUCING THE WATER SOLUBILITY OF WATERSOLUBLE HYDROXYLALKYL ESTERS OF STARCH AND CELLULOSE WHICH COMPRISES REACTING SAME WITH AN INSOLUBILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF UNSATURATED DIBASIC ALIPHATIC ACIDS AND THEIR ANHYDRIDES, AND THE WATERSOLUBLE DERIVATIVES OF SAID ACIDS AND ANHYDRIDES WHICH RETAIN THE ABILITY OF THE ACIDS AND ANHYDRIDES FROM WHICH THEY ARE DERIVATIZED TO CROSS-LINK THROUGH BOTH OF THEIR CARBOXYL GROUPS AND THEREBY EFFECT INSOLUBILIZATION OF SAID WATER-SOLUBLE HYDROXYALKYL ETHERS OF STARCH AND CELLULOSE, THE AMOUNT OF SAID INSOLUBILIZING AGENT BEING ABOUT 2%-8% BY WEIGHT OF SAID ETHER EMPLOYED.
Claim 2
Dependent Claim
94 words
PROCESS FOR REDUCING THE WATER SOLUBILITY OF WATERSOLUBLE HYDROXYLALKYL ESTERS OF STARCH AND CELLULOSE WHICH COMPRISES REACTING SAME WITH AN INSOLUBILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF UNSATURATED DIBASIC ALIPHATIC ACIDS AND THEIR ANHYDRIDES, AND THE WATERSOLUBLE DERIVATIVES OF SAID ACIDS AND ANHYDRIDES WHICH RETAIN THE ABILITY OF THE ACIDS AND ANHYDRIDES FROM WHICH THEY ARE DERIVATIZED TO CROSS-LINK THROUGH BOTH OF THEIR CARBOXYL GROUPS AND THEREBY EFFECT INSOLUBILIZATION OF SAID WATER-SOLUBLE HYDROXYALKYL ETHERS OF STARCH AND CELLULOSE, THE AMOUNT OF SAID INSOLUBILIZING AGENT BEING ABOUT 2%-8% BY WEIGHT OF SAID ETHER EMPLOYED.
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) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |