US3733299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyphenylene ethers with activated copper-amine catalysts
Assignee: General Electric Co
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Filing: 1971-06-10
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Granted: 1973-05-15
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Expires: 1991-06-10
Abstract
Abstract THERE IS DISCLOSED AN IMPROVED PROCESS FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT POLYPHENYLENE ETHERS BY OXIDATIVELY COUPLING A DI-ORTHO-SUBSTITUTED PHENOLIC PRECURSOR IN A REACTION SYSTEM CONTAINING OXYGEN AND A COMPLEX CATALYST FORMED FROM A COPPER SALT AND EITHER A PRIMARY, SECONDARY OR TERTIARY AMINE AND AN ALKALI METAL BROMIDE OR ALKALINE EARTH METAL BROMIDE AS AN ACTIVATOR FOR THE CATALYST. USE OF THE ACTIVATOR RESULTS IN THE FORMATION OF HIGHER MOLECULAR WEIGHT POLYMER IN A GIVEN REACTION TIME OR POLYMER OR COMPARABLE MOLECULAR WEIGHT IN SUBSTANTIALLY DECREASED REACTION TIME.
Inventors
- 👤 G Cooper
- 👤 J Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:20
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
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) | 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 |