US3733307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of polyphenylene ethers
Assignee: General Electric Co
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Filing: 1971-10-14
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Granted: 1973-05-15
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Expires: 1991-10-14
Abstract
Abstract COPOLYMERS WITH REPEATING UNITS OF (A) 2,6-DIARYL-1,4PHENYLENE ETHER AND (B) 2,6-DIHALO-1,4-OR 3,5-DIHALLO1,2-PHENYLENE ETHER UNITS ARE PROVIDED BY FREE RADICAL INITIATED POLYMERIZATION OF THE CORRESPONDING 2,6-DISUBSTITUTED-4-HALOPHENOLATES. THE NOVEL COPOLYMERS ARE MELT PROCESSABLE INTO ARTICLES HAVING EXTENDED HIGH TEMPERATURE RESISTANCE AND THOSE CONTAINING AT LEAST 15 MOLE PERCENT OF THE 2,6-OR 3,5-DIHALO-COMPONENT (B) ARE FLAME RESISTANT.
Inventors
- 👤 G Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:25
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |