US4187359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylene-terminated polyimide compositions
Assignee: United States Department of the Air Force
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Filing: 1978-12-06
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Granted: 1980-02-05
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Expires: 1998-12-06
Abstract
Abstract A composition of matter comprising an acetylene-terminated polyimide oligomer and trinitriloacetonitrile. The composition has a retarded cure rate, thereby facilitating the fabrication of void-free molded objects and composites.
Inventors
- 👤 Lewellyn G. Picklesimer
- 👤 Michael A. Lucarelli
- 👤 Theodore J. Reinhart, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:06
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A composition of matter comprising a major amount of an acetylene-terminated polyimide oligomer and a minor amount of trinitriloacetonitrile.
Claim 2
Dependent Claim
19 words
A composition of matter comprising a major amount of an acetylene-terminated polyimide oligomer and a minor amount of trinitriloacetonitrile.
Claim 3
Dependent Claim
21 words
The composition of claim 1 which comprises the acetylene-terminated polyimide oligomer and about 1 to 20 weight percent of the trinitriloacetonitrile.
Claim 4
Dependent Claim
24 words
The composition according to claim 2 in which the acetylene-terminated polyimide oligomer has the following structural formula: ##STR2## where n is 1 or 2.
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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |