Patent US1672324A successfully refreshed from Google Patents.
Patent US2861051A successfully refreshed from Google Patents.
US2861051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked graft copolymers of acrylonitrile and polyvinyl alcohols and method of preparing same
Assignee: Eastman Kodak Co
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Filing: 1956-05-29
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Granted: 1958-11-18
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Expires: 1976-05-29
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:42
CPC Classifications
C; C08; C08F; C08F261/00; C08F261/02; C08F261/04; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A RESINOUS GRAFT COPOLYMER OF (1) FROM 24.9 TO 53.9% BY WEIGHT OF POLYMERIZABLE MONOMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF (A) ACRYLONITRILE AND (B) A MIXTURE CONSISTING OF AT LEAST 80% BY WEIGHT OF ACRYLONITRILE AND THE REMAINDER OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF ISOPROPENYL ACETATE AND ACRYLAMIDE, (2) FROM 74.6 TO 44.9% BY WEIGHT OF A PREFORMED POLYMER SELECTED FROM THE GROUP CONSISTING OF, A HYDROLYZED POLYVINYL ACETATE WHEREIN FROM 70 TO 100% OF THE VINYL ACETATE UNITS HAVE BEEN CONVERTED TO VINYL ALCOHOL UNITS, AND A COPOLYMER CONSISTING OF 70% BY WEIGHT OF VINYL ALCOHOL UNITS AND THE REMAINDER OF ISOPROPENYL ACETATE UNITS, AND (3) FROM 0.5 TO 1.2% BY WEIGHT OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF DIVINYLBENZENE, DIALLYL PHTHALATE, TRIALLYL CYANURATE, ALLYL ACRYLATE AND ETHYLENE GLYCOL DIACRYLATE, AND WHEREIN THE SAID POLYMERIZABLE MONOMERIC MATERIAL AND THE SAID CROSS-LINKING AGENT HAVE BEEN COMBINED BY ADDITION POLYMERIZATION WITH THE SAID PREFORMED POLYMER TO GIVE THE SAID GRAFT COPOLYMER.
Claim 2
Dependent Claim
168 words
A RESINOUS GRAFT COPOLYMER OF (1) FROM 24.9 TO 53.9% BY WEIGHT OF POLYMERIZABLE MONOMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF (A) ACRYLONITRILE AND (B) A MIXTURE CONSISTING OF AT LEAST 80% BY WEIGHT OF ACRYLONITRILE AND THE REMAINDER OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF ISOPROPENYL ACETATE AND ACRYLAMIDE, (2) FROM 74.6 TO 44.9% BY WEIGHT OF A PREFORMED POLYMER SELECTED FROM THE GROUP CONSISTING OF, A HYDROLYZED POLYVINYL ACETATE WHEREIN FROM 70 TO 100% OF THE VINYL ACETATE UNITS HAVE BEEN CONVERTED TO VINYL ALCOHOL UNITS, AND A COPOLYMER CONSISTING OF 70% BY WEIGHT OF VINYL ALCOHOL UNITS AND THE REMAINDER OF ISOPROPENYL ACETATE UNITS, AND (3) FROM 0.5 TO 1.2% BY WEIGHT OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF DIVINYLBENZENE, DIALLYL PHTHALATE, TRIALLYL CYANURATE, ALLYL ACRYLATE AND ETHYLENE GLYCOL DIACRYLATE, AND WHEREIN THE SAID POLYMERIZABLE MONOMERIC MATERIAL AND THE SAID CROSS-LINKING AGENT HAVE BEEN COMBINED BY ADDITION POLYMERIZATION WITH THE SAID PREFORMED POLYMER TO GIVE THE SAID GRAFT COPOLYMER.
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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |