US4038320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylethynyl substituted aromatic diamines
Assignee: United States Department of the Air Force
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Filing: 1976-04-19
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Granted: 1977-07-26
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Expires: 1996-04-19
Abstract
Abstract As new compositions of matter, 2,2'-bis(phenylethynyl)-4,4'-diaminobiphenyl and 2,2'-bis(phenylethynyl)-5,5'-diaminobiphenyl. The compounds are useful as monomers suitable for the preparation of thermally stable polymer systems such as polyimides, polyamides and poly-Schiff bases.
Inventors
- 👤 Fred E. Arnold
- 👤 Frederick L. Hedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:16
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/07; C07C205/11; C07C205/12; C07C205/06; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G73/00; C08G73/06; C08G73/10; C08G73/1067
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A compound selected from the group consisting of 2,2'-bis(phenylethynyl)-4,4'-diaminobiphenyl and 2,2'-bis(phenylethynyl)-5,5'-diaminobiphenyl.
Claim 2
Dependent Claim
11 words
A compound selected from the group consisting of 2,2'-bis(phenylethynyl)-4,4'-diaminobiphenyl and 2,2'-bis(phenylethynyl)-5,5'-diaminobiphenyl.
Claim 3
Dependent Claim
8 words
The compound of claim 1 which is 2,2'-bis(phenylethynyl)-4,4'-diaminobiphenyl.
Claim 4
Dependent Claim
8 words
The compound of claim 1 which is 2,2'-bis(phenylethynyl)-5,5'-diaminobiphenyl.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |