US3345358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gel-forming polysaccharide derivatives prepared by cross esterification
Assignee: Vasco Ind Corp
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Filing: 1964-01-16
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Granted: 1967-10-03
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Expires: 1984-01-16
Abstract
No abstract record available.
Inventors
- 👤 Inklaar Petrus Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:55
CPC Classifications
C; C08; C08B; C08B37/00; C08B31/00; C08B31/003; C08B31/006; C08B31/02; C08B31/04; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
A METHOD OF PREPARING A GEL-FORMING DERIVATIVE OF POLYSACCHARIDE SELECTED FROM THE GROUP CONSISTING OF STARCH, AMYLOSE AND AMYLOPECTIN, WHICH COMPRISES LINKING TOGETHER MACROMOLECULES OF THE POLYSACCHARIDE BY ESTERIFYING RESPECTIVE CARBOXYL AND HYDROXYL GROUPS OF SUCH MOLECULES THROUGH METHYL ESTER BONDS.
Claim 2
Independent Claim
41 words
A METHOD OF PREPARING A GEL-FORMING DERIVATIVE OF POLYSACCHARIDE SELECTED FROM THE GROUP CONSISTING OF STARCH, AMYLOSE AND AMYLOPECTIN, WHICH COMPRISES LINKING TOGETHER MACROMOLECULES OF THE POLYSACCHARIDE BY ESTERIFYING RESPECTIVE CARBOXYL AND HYDROXYL GROUPS OF SUCH MOLECULES THROUGH METHYL ESTER BONDS.
Claim 3
Independent Claim
69 words
A METHOD OF PREPARING A GEL-FORMING DERIVATIVE OF A POLYSACCHARIDE SELECTED FROM THE GROUP CONSISTING OF STARCH, AMYLOSE AND AMYLOPECTN, WHICH COMPRISES ACIDIFYING A FINELY DIVIDED CARBOXYMETHYL ETHER OF THE POLYSACCHARIDE IN A WATER-MISCIBLE ORGANIC LIQUID MEDIUM, HOLDING THE MATERIAL ACIDIFIED THEREIN UNTIL ACID CARBOXYMETHYL GROUPS IN THE MATERIAL FORM ESTER BONDS TO LINK TOGETHER MACROMOLECULES OF THE POLYSCCHARIDE, AND THEREAFTER NEUTRALIZING ACID CARBOXYMETHYL GROUPS REMAINING IN THE MATERIAL.
Claim 4
Independent Claim
69 words
A METHOD OF PREPARING A GEL-FORMING DERIVATIVE OF A POLYSACCHARIDE SELECTED FROM THE GROUP CONSISTING OF STARCH, AMYLOSE AND AMYLOPECTN, WHICH COMPRISES ACIDIFYING A FINELY DIVIDED CARBOXYMETHYL ETHER OF THE POLYSACCHARIDE IN A WATER-MISCIBLE ORGANIC LIQUID MEDIUM, HOLDING THE MATERIAL ACIDIFIED THEREIN UNTIL ACID CARBOXYMETHYL GROUPS IN THE MATERIAL FORM ESTER BONDS TO LINK TOGETHER MACROMOLECULES OF THE POLYSCCHARIDE, AND THEREAFTER NEUTRALIZING ACID CARBOXYMETHYL GROUPS REMAINING IN THE MATERIAL.
References Cited (Backward Citations)
US2698322A
Cited
US3238193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |