US3966729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition curable phenyl-quinoxaline compositions and their synthesis
Assignee: United States Department of the Air Force
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Filing: 1975-05-19
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Granted: 1976-06-29
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Expires: 1995-05-19
Abstract
Abstract An aromatic bis(o-diamine) is reacted with an aromatic bisbenzil to provide a benzil end-capped quinoxaline oligomer which is then reacted with 4-(3-ethynylphenoxy)orthophenylene diamine to give an ethynyl terminated polyquinoxaline. Because the polyquinoxalines can be cured to provide thermally stable polymer compositions having superior mechanical properties, the compositions are particularly suitable for use in the fabrication of reinforced composite structures.
Inventors
- 👤 Robert F. Kovar
- 👤 Fred E. Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:03
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/36; C07D241/38; C07D241/40; C07D241/42; C07C; C07C205/00; C07C205/27; C07C205/35; C07C205/36; C07C205/38; C08; C08G; C08G73/00; C08G73/06; C08G73/0683; C08G73/0694
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
An ethynyl terminated polyquinoxaline having the following structural formula: ##SPC6## where R is a single bond, ##EQU2## ##SPC7## and n is an integer from 1 to 20, inclusive.
Claim 2
Dependent Claim
28 words
An ethynyl terminated polyquinoxaline having the following structural formula: ##SPC6## where R is a single bond, ##EQU2## ##SPC7## and n is an integer from 1 to 20, inclusive.
Claim 3
Dependent Claim
16 words
The polyquinoxaline of claim 1 in which R is a single bond and R' is ##SPC8##
Claim 4
Dependent Claim
16 words
The polyquinoxaline of claim 1 in which R is a single bond and R' is ##SPC9##
Claim 5
Dependent Claim
16 words
The polyquinoxaline of claim 1 in which R is a single bond and R' is ##SPC10##
Claim 6
Dependent Claim
15 words
The polyquinoxaline of claim 1 in which R is -- O-- and R' is ##SPC11##
Claim 7
Dependent Claim
15 words
The polyquinoxaline of claim 1 in which R is -- O-- and R' is ##SPC12##
References Cited (Backward Citations)
US3876614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |