US3792017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable quinoxaline polymers and method of synthesis
Assignee: United States Department of the Air Force
•
Filing: 1972-10-19
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Granted: 1974-02-12
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Expires: 1992-10-19
Abstract
Abstract THERMALLY STABLE QUINOXALINE POLYMERS ARE PREPARED BY SOLUTION POLYCONDENSATION OF CERTAIN AROMATIC HETEROCYCLIC FUSED TETRAAMINES WITH AROMATIC DIBENZILS. THE HIGH THERMAL STABILITY, THE HIGH GLASS TRANSITION TEMPERATURE, OR THE LACK OF SUCH A TEMPERATURE, AND THE SOLUBILITY OF THE POLYMERS IN APROTIC SOLVENTS RENDER THEM ESPECIALLY USEFUL AS ADHESIVES AND IN HIGH TEMPERATURE APPLICATIONS SUCH AS IN THE FABRICATION OF PLASTIC COMPOSITES AND PROTECTIVE COATINGS.
Inventors
- 👤 F Arnold
- 👤 F Hedberg
- 👤 R Kovar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:53
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0683; C08G73/0694
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |