Patent US606912A successfully refreshed from Google Patents.
Patent US3828013A successfully refreshed from Google Patents.
US3828013A
Expired / Lapsed
US
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Chemical process for preparing odorless taste-free acrylonitrile/aromatic olefin copolymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-05-17
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Granted: 1974-08-06
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Expires: 1992-05-17
Abstract
Abstract A PROCESS IS PROVIDED FOR THE POLYMERISATION OF ACRYLONITRILE AND AT LEAST ONE AROMATIC OLEFINE IN WHICH A SUBSTANTIALLY ODOURLESS AND TASTE-FREE COPOLYMER OF ACRYLONITRILE, CONTAINING 50 TO 95% MOLAR OF UNITS DERIVED FROM ACRYLONITRILE AND 50 TO 5% MOLAR OF UNITS DERIVED FROM AT LEAST ONE AROMATIC OLEFINE, IS OBTAINED WITH RANDOMLY DISTRIBUTED UNTIS OF AROMATIC OLEFINE IN A POLYMERISATION MIXTURE CONTAINGING ACRYLONITRILE AND AROMATIC OLEFINE AND AT LEAST ONE ALKANE THIOL OF LOW VOLATILITY WHILE ADDING MONOMER FEED CONTAINING AROMATIC OLEFINE AND AT LEAST ONE ALKANE THIOL OF HIGH VOLATILITY AT A RATE DETERMINED BY THE RATE OF POLYMERISATION.
Inventors
- 👤 E Nield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:20
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F220/00; C08F220/02; C08F220/42; C08F220/44
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |