US2768148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution polymerization of acrylonitrile
Assignee: Celanese Corp
•
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 10:07
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)
US2335454A
Cited
US2436926A
Cited
US2471959A
Cited
GB638331A
Cited
US2570200A
Cited
US2585537A
Cited
US2570201A
Cited
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 |