US3686112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing acrylonitrile
Assignee: Individual
•
Filing: 1969-10-06
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Granted: 1972-08-22
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Expires: 1989-10-06
Abstract
Abstract A CONTINUOUS METHOD FOR THE POLYMERIZATION OF ACRYLONITRILE TO PRODUCE A SPINNABLE SOLUTION OF POLYACRYLONITRILE COMPRISING MAINTAINING A POLYMERIZATION SYSTEM COMPRISING MONOMERIC ACRYLONITRILE, A DIALKYLAMIDE AND POLYMERIC ACRYLONITRILE IN A CONCENTRATION OF AT LEAST 25% BY WEIGHT, THE WEIGHT RATIO OF MONOMERIC ACRYLONITRILE TO DIALKYLAMIDE BEING MAINTAINED AT AT LEAST 1.63:1. THE REACTION IS CONDUCTED IN THE PRESENCE OF A REDOX CATALYST AT A TEMPERATURE BETWEEN 40* AND 70* C.
Inventors
- 👤 August Vrancken
- 👤 Cyrille Van Eygen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:04
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |