US3829518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of polyarylenes
Assignee: Standard Oil Co
•
Filing: 1972-06-21
•
Granted: 1974-08-13
•
Expires: 1992-06-21
Abstract
Abstract POLYARYLENES, I.E., POLYMERS OF AROMATIC COMPOUNDS, CAN BE PRODUCED BY THE DEHYDROGENATIVE COUPLING OF PARTIALLY HYDROGENATED AROMATICS OVER A CATALYST, IN THE PRESENCE OF HYDROGEN, AT ELEVATED TEMPERATURES AND PRESSURES. THE POLYARYLENES CAN ALSO BE PRODUCED FROM AROMATIC COMPOUNDS BY SUBJECTING THE AROMATICS TO CONTROLLED PARTIAL HYDROGENATION AS WELL AS THE DEHYDROGENATIVE COUPLING. THE POLYARYLENES PRODUCED BY THIS PROCESS ARE SOLUBLE TO AN EXTENT UNKNOWN HERETOFORE IN THE ART AND POSSESS THERMAL PROPERTIES WHICH RENDERS THEM USEFUL IN HIGH TEMPERATURE APPLICATIONS SUCH AS ABLATIVE MATERIALS.
Inventors
- 👤 A Wennerberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:10
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/10
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |