US3793246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing aromatic polyethers
Assignee: Asahi Kasei Corp
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Filing: 1971-12-17
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Granted: 1974-02-19
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Expires: 1991-12-17
Abstract
Abstract AROMATIC POLYETHERS HAVING EXCELLENT THERMAL, MECHANICAL AND ELECTRICAL PROPERTIES ARE OBTAINED BY OXIDATIVE POLYMERIZATION OF 2,6-DISUBSTITUTED PHENOLS IN THE PRESENCE OF A CATALYST COMPRISING A COPPER OR MANGANESE SALT, A PRIMARY AMINE AND AT LEAST ONE ALPHATIC, ALICYCLIC OR AROMATIC ALDEHYDE.
Inventors
- 👤 S Izawa
- 👤 M Ishihara
- 👤 K Harada
- 👤 K Mizushiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:11
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |