US3661848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of polyphenylene ethers
Assignee: General Electric Co
•
Filing: 1970-11-06
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Granted: 1972-05-09
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Expires: 1990-11-06
Abstract
Abstract A PROCESS FOR THE FORMATION OF HIGH MOLECULAR WEIGHT POLYPHENYLENE ETHERS BY THE OXIDATIVE OUPLING OF A PHENOLIC PERCURSOR IN A REACTION SYSTEM CONTAINING A LOW MOLECULAR WEIGHT ALCOHOL AND A COMPLEX CATALYST FORMED FROM A NON-BASIC CUPRIC SALT AND A PRIMARY OR SECONDARY AMINE. THE PROCESS IS CHARACTERIZED BY THE ADDITION OF THE ALCOHOL TO THE REACTION SYSTEM WHICH (1) RESULTS IN THE FORMATION OF HIGHER MOLECULAR WEIGHT POLYMER IN A GIVEN REACTION TIME OR POLYMER OF COMPARTABLE MOLECULAR WEIGHT IN SUBSTANTIALLY DECREASED REACTION TIME AND (2) PERMITS THE USE OF AQUEOUS SOLUTIONS OF CUPRIC SALTS AND CUPRIC SALTS IN HYDRATED FORM.
Inventors
- 👤 Glenn D Cooper
- 👤 James G Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:17
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |