US4365034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylene-terminated polyimide compositions
Assignee: United States Department of the Air Force
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Filing: 1981-09-21
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Granted: 1982-12-21
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Expires: 2001-09-21
Abstract
Abstract A composition of matter comprising an acetylene-terminated polyimide oligomer and a cure rate inhibitor selected from the group consisting of hydroquinone, maleic acid, glutaric acid, dibetanapthyl para-phenylene diamine. The composition has a retarded cure rate, thereby facilitating the fabrication of void-free molded objects and composites.
Inventors
- 👤 Mark F. Grimes
- 👤 Theodore J. Reinhart, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:00
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/022; C08F38/00; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; C08G73/122
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
A composition of matter comprising a major amount of an acetylene-terminated polyimide oligomer and a minor amount of a cure rate inhibitor selected from the group consisting of hydroquinone maleic acid, glutaric acid, dibetanaphthyl para-phenylene diamine.
Claim 2
Dependent Claim
36 words
A composition of matter comprising a major amount of an acetylene-terminated polyimide oligomer and a minor amount of a cure rate inhibitor selected from the group consisting of hydroquinone maleic acid, glutaric acid, dibetanaphthyl para-phenylene diamine.
Claim 3
Dependent Claim
23 words
The composition of claim 1 which comprises the acetylene-terminated polyimide oligomer and about 1 to 20 weight percent of the cure rate inhibitor.
Claim 4
Dependent Claim
18 words
The composition according to claim 2 in which the acetylene-terminated polyimide oligomer has the following structural formula: ##STR2##
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |