US4125725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylated carboxyquinoxalines
Assignee: United States Department of the Navy
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Filing: 1977-06-03
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Granted: 1978-11-14
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Expires: 1997-06-03
Abstract
Abstract High molecular weight polyphenylamide-quinoxalines comprised essentially ofnits of the formula ##STR1## or mixtures thereof, are prepared by heating bifunctional monomers of the formula ##STR2## or mixtures thereof, wherein R is COCH 3 or --H to a temperature above the melting point of the monomer but below the decomposition temperature of the polyphenylamide -quinoxaline (Ca. 475-490° C). This melt polymerization of the bifunctional monomers produces strong, low void adhesive joints.
Inventors
- 👤 James V. Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:09
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/36; C07D241/38; C07D241/40; C07D241/42; C08; C08G; C08G73/00; C08G73/06; C08G73/0683; C08G73/0694
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
24 words
A compound selected from the group consisting of ##STR21## and mixtures thereof, wherein R is selected from the group consisting of ##STR22## and H.
Claim 2
Dependent Claim
24 words
A compound selected from the group consisting of ##STR21## and mixtures thereof, wherein R is selected from the group consisting of ##STR22## and H.
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein R is ##STR23##
Claim 4
Dependent Claim
9 words
The compound of claim 1 wherein R is --H.
Claim 5
Dependent Claim
20 words
A compound of the formula ##STR24## wherein R is selected from the group consisting of ##STR25## --H, and mixtures thereof.
Claim 6
Dependent Claim
20 words
A compound of the formula ##STR24## wherein R is selected from the group consisting of ##STR25## --H, and mixtures thereof.
Claim 7
Dependent Claim
8 words
The compound of 4 wherein R is ##STR26##
Claim 8
Dependent Claim
8 words
The compound of 4 wherein R is ##STR26##
Claim 9
Dependent Claim
9 words
The compound of claim 4 wherein R is --H.
Claim 10
Dependent Claim
23 words
The compound of claim 1 having the formula ##STR27## wherein R is selected from the group consisting of ##STR28## --H, and mixtures thereof.
Claim 11
Dependent Claim
9 words
The compound of claim 7 wherein R is ##STR29##
Claim 12
Dependent Claim
9 words
The compound of claim 7 wherein R is --H.
Claim 13
Dependent Claim
20 words
A mixture of compounds of the formulas ##STR30## wherein R is selected from the group consisting of ##STR31## and H.
Claim 14
Dependent Claim
20 words
A mixture of compounds of the formulas ##STR30## wherein R is selected from the group consisting of ##STR31## and H.
Claim 15
Dependent Claim
9 words
The mixture of claim 10 wherein R is ##STR32##
Claim 16
Dependent Claim
9 words
The mixture of claim 10 wherein R is --H.
Claim 17
Dependent Claim
8 words
A mixture of 3-(p-acetamidophenyl)-2-phenyl-6-carboxyquinoxaline, 3-(p-acetamidophenyl)-2-phenyl-7-carboxyquinoxaline, 3-(p-aminophenyl)-2-phenyl-6-carboxyquinoxaline, and 3-(p-aminophenyl)-2-phenyl-7-carboxyquinoxaline.
Claim 18
Dependent Claim
8 words
A mixture of 3-(p-acetamidophenyl)-2-phenyl-6-carboxyquinoxaline, 3-(p-acetamidophenyl)-2-phenyl-7-carboxyquinoxaline, 3-(p-aminophenyl)-2-phenyl-6-carboxyquinoxaline, and 3-(p-aminophenyl)-2-phenyl-7-carboxyquinoxaline.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |