US4657708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethynyl-containing phthaloyl halides
Assignee: United States Department of the Air Force
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Filing: 1985-12-10
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Granted: 1987-04-14
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Expires: 2005-12-10
Abstract
Abstract Aromatic monomers, each containing at least one o-ethynyl carboxylic acid halide subunit: ##STR1## wherein X is Cl or Br. These monomers can be reacted with amines to form aromatic polyamide resins which can be thermally treated to undergo intromolecular cyclization, without evolution of volatiles, into polyimidines.
Inventors
- 👤 Robert C. Evers
- 👤 George J. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/2635; C07C45/00; C07C45/42; C07C45/43; C07C45/51; C07C45/54; C07C45/61; C07C45/67; C07C45/68; C07C51/00; C07C51/16; C07C63/00; C07C63/66
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A 2,5-bis(arylethynyl)terephthaloyl halide of the general formula ##STR10## wherein X is Cl or Br and Ar' is a monovalent aromatic radical selected from the group consisting of phenyl and C 1 to C 3 -substituted phenyl.
Claim 2
Dependent Claim
36 words
A 2,5-bis(arylethynyl)terephthaloyl halide of the general formula ##STR10## wherein X is Cl or Br and Ar' is a monovalent aromatic radical selected from the group consisting of phenyl and C 1 to C 3 -substituted phenyl.
Claim 3
Dependent Claim
13 words
The compound of claim 1 wherein X is --Cl and Ar' is phenyl.
Claim 4
Dependent Claim
36 words
A 2,4'-bis(arylethynyl)isophthaloyl halide of the general formula ##STR11## wherein X is Cl or Br and Ar' is a monovalent aromatic radical selected from the group consisting of phenyl and C 1 to C 3 -substituted phenyl.
Claim 5
Dependent Claim
36 words
A 2,4'-bis(arylethynyl)isophthaloyl halide of the general formula ##STR11## wherein X is Cl or Br and Ar' is a monovalent aromatic radical selected from the group consisting of phenyl and C 1 to C 3 -substituted phenyl.
Claim 6
Dependent Claim
13 words
The compound of claim 3 wherein X is --Cl and Ar' is phenyl.
References Cited (Backward Citations)
US3609160A
Cited
US4367329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |