US3663661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber modified polyphenylene ether and process
Assignee: General Electric Co
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Filing: 1970-03-09
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Granted: 1972-05-16
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Expires: 1990-03-09
Abstract
Abstract THIS INVENTION RELATES TO RUBBER MODIFIED POLYPHENYLENE ETHER COMPOSITIONS AND TO A METHOD FOR FORMING THE SAME. THE METHOD COMPRISES POLYMERIZING A MONOMERIC PHENOL TO A HIGH MOLECULAR WEIGHT POLYPHENYLENE ETHER IN A REACTION MEDIUM CONTAINING SOLVATED RUBBER AND RECOVERING POLYMERIC COMPONENTS FROM SOLUTION IN THE FORM OF A PRECIPITATE BY ADMIXTURE OF SAID REACTION MEDIUM WITH A NON-SOLVENT PRECIPITANT. AFTER DRYING, THE RECOVERED PRECIPITATE COMPRISES A FREE FLOWING POWDER CONSISTING OF THE POLYPHENYLENE ETHER AND THE RUBBER WHICH POWDER IS SUITABLE FOR MOLDING OPERATIONS SUCH AS EXTRUSION, COLD FORMING AND THE LIKE.
Inventors
- 👤 Arthur Katchman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:49
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44; Y; Y10; Y10S; Y10S525/00; Y10S525/905
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |