US2555646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric thermoreversible gels
Assignee: GAF Chemicals Corp
•
Filing: 1947-05-02
•
Granted: 1951-06-05
•
Expires: 1967-05-02
Abstract
No abstract record available.
Inventors
- 👤 Giffin D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:30
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F2/00; C08F2/46; C08F2/48; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; C08F8/00; C08F8/14; C08F8/30; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/25; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE PROCESS OF PRODUCING A THERMOREVERSIBLE GEL WHICH COMPRISES TREATING IN ACIDIFIED AQUEOUS SOLUTION A WATER-SOLUBLE POLYMERIC MATERIAL CONTAINING FREE KETO GROUPS IN AT LEAST ABOUT 4.5 PER CENT OF THE RECURRING RADICALS IN SAID POLYMERIC MATERIALS, SAID WATER-SOLUBLE POLYMERIC MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF ACYLATED POLYVINYL ALCOHOL OBTAINED BY ACYLATING A WATER-SOLUBLE POLYVINYL ALCOHOL WHOESE 4% AQUEOUS SOLUTION HAS A VISCOSITY OF FROM 15 TO 30 CENTIPOSES AT 20* C. WITH DIKETENE, INTERPOLYMERS OF 70 TO 95% OF AN ACRYLAMIDE WITH 30 TO 5% OF AN ALLYLACETOACETATE, INTERPOLYMERS OF AMIDES OF BOXOCARBOXYLIC ACIDS AND B,Y-ETHYLENEICALLY UNSATURATED LOWER ALIPHATIC AMINES AND INTERPOLYMERS OF METHYL VINYL KETONE WITH AMIDES OF Y-B-UNSATURATED MONOCARBOXYLIC ACIDS CONTAINING 3 TO 4 CARBON ATOMS; WITH A WATER-SOLUBLE POLYHYDRAZIDE OF POLYCARBOXYLIC ACID.
Claim 2
Dependent Claim
128 words
THE PROCESS OF PRODUCING A THERMOREVERSIBLE GEL WHICH COMPRISES TREATING IN ACIDIFIED AQUEOUS SOLUTION A WATER-SOLUBLE POLYMERIC MATERIAL CONTAINING FREE KETO GROUPS IN AT LEAST ABOUT 4.5 PER CENT OF THE RECURRING RADICALS IN SAID POLYMERIC MATERIALS, SAID WATER-SOLUBLE POLYMERIC MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF ACYLATED POLYVINYL ALCOHOL OBTAINED BY ACYLATING A WATER-SOLUBLE POLYVINYL ALCOHOL WHOESE 4% AQUEOUS SOLUTION HAS A VISCOSITY OF FROM 15 TO 30 CENTIPOSES AT 20* C. WITH DIKETENE, INTERPOLYMERS OF 70 TO 95% OF AN ACRYLAMIDE WITH 30 TO 5% OF AN ALLYLACETOACETATE, INTERPOLYMERS OF AMIDES OF BOXOCARBOXYLIC ACIDS AND B,Y-ETHYLENEICALLY UNSATURATED LOWER ALIPHATIC AMINES AND INTERPOLYMERS OF METHYL VINYL KETONE WITH AMIDES OF Y-B-UNSATURATED MONOCARBOXYLIC ACIDS CONTAINING 3 TO 4 CARBON ATOMS; WITH A WATER-SOLUBLE POLYHYDRAZIDE OF POLYCARBOXYLIC ACID.
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) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |