Patent US2991646A successfully refreshed from Google Patents.
US3554991A
Expired / Lapsed
US
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Crystalline olefinic nitrile polymers and method for manufacturing same
Assignee: Standard Oil Co
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Filing: 1969-03-05
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Granted: 1971-01-12
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Expires: 1989-03-05
Abstract
Abstract OLEFINIC NITRILE POLYMERS, SUCH AS POLYACRYLONITRILE, ARE SUBJECTED TO SHEARING ON A ROLL MILL AND THE THUS SHEARED POLYMER, WHICH HAS 3-DIMENSIONAL CRYSTALLINITY, IS MOLDED INTO ARTICLES HAVING EXCELLENT HEAT DISTORTION AND IMPACT PROPERTIES.
Inventors
- 👤 Russell K Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:29
CPC Classifications
C; C08; C08J; C08J3/00; C08F; C08F20/00; C08F20/02; C08F20/42; C08J2333/00; C08J2333/18; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |