US4131748A
Expired / Lapsed
US
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P-Terphenylene-dicarboxylic acids and their synthesis
Assignee: United States Department of the Air Force
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Filing: 1977-06-29
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Granted: 1978-12-26
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Expires: 1997-06-29
Abstract
Abstract p-Terphenylene-dicarboxylic acids in which aromatic groups are attached to the middle phenyl group of the terphenylene moiety. The compounds are useful as monomers in the preparation of rod-like, para-ordered aromatic heterocyclic polymers.
Inventors
- 👤 Fred E. Arnold
- 👤 James F. Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:54
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/2637; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/74; C07C49/00; C07C49/587; C07C49/687; C07C49/697; C07C51/00; C07C51/08; C07C63/00; C07C63/33; C07C63/331
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A p-terphenylene-dicarboxylic acid having the following structural formula: ##STR6## wherein Ar is a monovalent aromatic radical selected from the group consisting of ##STR7## and R and R' are individually selected from the group consisting of hydrogen, a monovalent aromatic radical as listed above, --CH 2 --CH 3 , --CH 2 --CH 2 --CH 3 , --CH 2 --CH 2 --CH 2 --CH 3 , ##STR8##
Claim 2
Dependent Claim
65 words
A p-terphenylene-dicarboxylic acid having the following structural formula: ##STR6## wherein Ar is a monovalent aromatic radical selected from the group consisting of ##STR7## and R and R' are individually selected from the group consisting of hydrogen, a monovalent aromatic radical as listed above, --CH 2 --CH 3 , --CH 2 --CH 2 --CH 3 , --CH 2 --CH 2 --CH 2 --CH 3 , ##STR8##
Claim 3
Dependent Claim
19 words
The p-terphenylene-dicarboxylic acid according to claim 1 in which Ar is ##STR9## and R and R' are each ##STR10##
Claim 4
Dependent Claim
19 words
The p-terphenylene-dicarboxylic acid according to claim 1 in which Ar is ##STR11## and R and R' are each hydrogen.
Claim 5
Dependent Claim
19 words
The p-terphenylene-dicarboxylic acid according to claim 1 in which Ar is ##STR12## R is hydrogen and R' is ##STR13##
Claim 6
Dependent Claim
19 words
The p-terphenylene-dicarboxylic acid according to claim 1 in which Ar is ##STR14## and R and R' are each ##STR15##
Claim 7
Dependent Claim
19 words
The p-terphenylene-dicarboxylic acid according to claim 1 in which Ar is ##STR16## R is hydrogen and R' is ##STR17##
Claim 8
Dependent Claim
28 words
A p-terphenylene-dicarboxylic acid having the following structural formula: ##STR18## wherein Ar is ##STR19## and R and R' are individually selected from the group consisting of hydrogen and ##STR20##
Claim 9
Dependent Claim
28 words
A p-terphenylene-dicarboxylic acid having the following structural formula: ##STR18## wherein Ar is ##STR19## and R and R' are individually selected from the group consisting of hydrogen and ##STR20##
References Cited (Backward Citations)
US3953498A
Cited
US3903101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |