US3630994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimides prepared from substituted quinoxalines
Assignee: Ashland LLC
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Filing: 1969-12-29
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Granted: 1971-12-28
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Expires: 1989-12-29
Abstract
Abstract QUINOXALINES REPRESENTED BY THE GENERAL FORMULA 2-(X-AR-),X-QUINOXALINE; 6-(((X-AR-)QUINOXALIN-6-YL)-Y-),(X-AR-)QUINOXALINE; AND 2-((X-QUINOXALIN-2-YL)-Z-),Y-QUINOXALINE WHEREIN X IS NITRO OR AMINO, AR IS DIVALENT AROMATIC HYDROCARBON RADICAL, Y IS A COVALENT BOND OR A DIVALENT LINKING RADICAL AND Z IS A DIVALENT RADICAL CONTAINING ONE OR TWO BENZENE RINGS. THE COMPOSITIONS ARE USEFUL IN THE FORMATON FORMATION OF FIBER AND FILM FORMING POLYIMIDES AND POLYAMIDES AND IN THE FORMATION OF MOLDING RESINS.
Inventors
- 👤 Billy M Culbertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:26
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1085
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |