US3586736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl ether modified polyphenylene oxide
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1969-06-05
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Granted: 1971-06-22
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Expires: 1989-06-05
Abstract
Abstract A NOVEL MODIFIED POLYPHENYLENE OXIDE WHICH IS STABLE AGAINST THERMAL OXIDATION IS PREPARED BY CONTACTING A VINYL ETHER COMPOUND WITH A LEWIS ACID IN THE PRESENCE OF A POLYPHENYLENE OXIDE TO POLYMERIZE THE VINYL ETHER COMPOUND. SAID REACTION MAY BE EFFECTED IN THE PRESENCE OR ABSENCE OF A REACTION MEDIUM, SUCH AS ALIPHATIC OR ALICYCLIC HYDROCARBONS OR AROMATIC HYDROCARBONS OR DERIVATIVES THEREOF. THE REACTION TEMPERATURE IS USUALLY BELOW 140*C. THE AMOUNT OF THE LEWIS ACID IS PREFERABLY 0.0001 TO 10% BY WEIGHT BASED ON THE TOTAL AMOUNT OF THE REACTION MIXTURE.
Inventors
- 👤 Toshio Takemura
- 👤 Isamu Nakagawa
- 👤 Seizo Nakashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:00
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/06; C08F283/08; 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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |