US3379720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble polymers and process of preparing
Assignee: Hercules LLC
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Filing: 1964-10-12
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Granted: 1968-04-23
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Expires: 1984-10-12
Abstract
No abstract record available.
Inventors
- 👤 Albert R Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:15
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08B; C08B11/00; C08B11/20; C08B3/00; C08B3/22; C08B37/00; C08J2300/00; C08J2300/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
PROCESS OF PREPARING MODIFIED POLYSACCHARIDES SELECTED FROM THE GROUP CONSISTING JOF STARCH, NATURAL GUMS AND ETHERS AND ESTERS OF CELLULOSE, STARCH AND NATURAL GUMS HAVING BOTH HYDROXYL AND CARBOXYL GROUPS WHICH COMPRISES SLURRYING WATER-SOLUBLE POLYSACCHARIDE IN AN INERT MEDIUM, ACIDIFYING SAID POLYSACCHARIDE UNTIL THE RATIO RANGE OF THE FREE ACID FORM TO THE SALT FORM OF ITS CARBOXYL GROUPS IS ABOUT 0.007/1-3/1, REMOVING EXCESS ACID FROM THE ACIDIFIED POLYSACCHARIDE AND DRYING SAME, THE RESULTING MODIFIED POLYSACCHARIDE BEING WATER SOLUBLE AND YET CAPABLE OF BELING INSOLUBILIZED MERELY BY CURING.
Claim 2
Dependent Claim
88 words
PROCESS OF PREPARING MODIFIED POLYSACCHARIDES SELECTED FROM THE GROUP CONSISTING JOF STARCH, NATURAL GUMS AND ETHERS AND ESTERS OF CELLULOSE, STARCH AND NATURAL GUMS HAVING BOTH HYDROXYL AND CARBOXYL GROUPS WHICH COMPRISES SLURRYING WATER-SOLUBLE POLYSACCHARIDE IN AN INERT MEDIUM, ACIDIFYING SAID POLYSACCHARIDE UNTIL THE RATIO RANGE OF THE FREE ACID FORM TO THE SALT FORM OF ITS CARBOXYL GROUPS IS ABOUT 0.007/1-3/1, REMOVING EXCESS ACID FROM THE ACIDIFIED POLYSACCHARIDE AND DRYING SAME, THE RESULTING MODIFIED POLYSACCHARIDE BEING WATER SOLUBLE AND YET CAPABLE OF BELING INSOLUBILIZED MERELY BY CURING.
References Cited (Backward Citations)
US2766137A
Cited
US3017237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |