Patent US3736291A successfully refreshed from Google Patents.
US3736291A
Expired / Lapsed
US
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Poly(arylene oxides)
Assignee: Individual
•
Filing: 1971-10-14
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Granted: 1973-05-29
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Expires: 1991-10-14
Abstract
Abstract FILM AND FIBER FORMING POLY(ARYLENE OXIDES) ARE PRODUCED FROM MONOMERS OF THE FORMULA X-AR-OH WHEREIN X IS A HALOGEN ATOM AND AR IS A LINEAR CHAIN OF FROM 2-10 UNSUBSTITUTED PHENYLENE GROUPS BONDED TOGETHER DIRECTLY OR THROUGH ETHER OXYGEN. THE MONOMER IS CONVERTED TO AN ALKALI METAL SALT WHICH IS THEN HEATED IN THE PRESENCE OF A COPPER CATALYST.
Inventors
- 👤 H Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:38
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/20; C07C43/205; C07C43/2055; C07C43/257; C07C43/295; C08; C08G; C08G65/00; C08G65/34; C08G65/38
Claims Analysis
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |