US2719136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions from polymerizing acrylonitrile in the presence of maleic anhydride copolymers
Assignee: Eastman Kodak Co
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Filing: 1951-11-29
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Granted: 1955-09-27
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Expires: 1971-11-29
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:40
CPC Classifications
C; C08; C08F; C08F267/00; C08F267/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR PREPARING A COMPOSITE POLYMER OF ACRYLONITRILE AND A MALEIC ANHYDRIDE COPOLYMER COMPRISING HEATING IN THE PRESENCE OF A PEROXIDE POLYMERIZATION CATALYST A MIXTURE COMPRISING FROM 55 TO 85 PERCENT BY WEIGHT OF ACRYLONITRILE AS THE SOLE POLYMERIZABLE MONOMER AND FROM 45 TO 15 PER CENT BY WEIGHT OF AN APPROXIMATELY 1:1 COPOLYMER OF MALEIC ANHYDRIDE AND AN UNSATURATED COMPOUND SELECTED FROM THE GROUP CONSISTING OF ISOPROPENYL ACETATE AND STYRENE.
Claim 2
Dependent Claim
72 words
A PROCESS FOR PREPARING A COMPOSITE POLYMER OF ACRYLONITRILE AND A MALEIC ANHYDRIDE COPOLYMER COMPRISING HEATING IN THE PRESENCE OF A PEROXIDE POLYMERIZATION CATALYST A MIXTURE COMPRISING FROM 55 TO 85 PERCENT BY WEIGHT OF ACRYLONITRILE AS THE SOLE POLYMERIZABLE MONOMER AND FROM 45 TO 15 PER CENT BY WEIGHT OF AN APPROXIMATELY 1:1 COPOLYMER OF MALEIC ANHYDRIDE AND AN UNSATURATED COMPOUND SELECTED FROM THE GROUP CONSISTING OF ISOPROPENYL ACETATE AND STYRENE.
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) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |