Patent US2768148A successfully refreshed from Google Patents.
US2768148A
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Solution polymerization of acrylonitrile
Assignee: Celanese Corp
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Filing: 1952-11-01
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Granted: 1956-10-23
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Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Calvin E Schildknecht
- 👤 Mary L Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:43
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN A PROCESS FOR THE PRODUCTION OF POLYMERS OF ACRYLONITRILE CONTAINING AT LEAST 73 MOLE PERCENT OF ACRYLONITRILE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN A SOLVENT SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC CYCLIC CARBONATES AND LACTONES, CONTAINING 3 TO 6 CARBON ATOMS IN THE RING, THAT WILL NOT ENTER INTO THE POLYMERIZATION REACTION.
Claim 2
Dependent Claim
57 words
IN A PROCESS FOR THE PRODUCTION OF POLYMERS OF ACRYLONITRILE CONTAINING AT LEAST 73 MOLE PERCENT OF ACRYLONITRILE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN A SOLVENT SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC CYCLIC CARBONATES AND LACTONES, CONTAINING 3 TO 6 CARBON ATOMS IN THE RING, THAT WILL NOT ENTER INTO THE POLYMERIZATION REACTION.
References Cited (Backward Citations)
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Cited
US2570200A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |