US4433115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus-containing imide resins
Assignee: National Aeronautics and Space Administration
•
Filing: 1983-07-11
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Granted: 1984-02-21
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Expires: 2003-07-11
Abstract
Abstract Flame-resistant reinforced bodies are disclosed which are composed of reinforcing fibers, filaments or fabrics in a cured body of bis- and tris-imide resins derived from tris(m-aminophenyl) phosphine oxides by reaction with maleic anhydride or its derivatives, or of addition polymers of such imides, including a variant in which a mono-imide is condensed with a dianhydride and the product is treated with a further quantity of maleic anhydride.
Inventors
- 👤 Indra K. Varma
- 👤 George M. Fohlen
- 👤 John A. Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:17
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08L79/085; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/125; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/92; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
78 words
A fiber-reinforced imide polymer composite comprising reinforcing fiber in a cured polymer of an imide have a structure selected from ##STR6## wherein R 1 and R 2 are selected from the group consisting of chlorine, methyl and hydrogen; R 3 is the amino group or an imide group ##STR7## X is a linking entity selected from the group consisting of a valence bond, --O--, --S--, --C n H 2n -- wherein n is 1, 2, or 3, ##STR8##
Claim 2
Dependent Claim
78 words
A fiber-reinforced imide polymer composite comprising reinforcing fiber in a cured polymer of an imide have a structure selected from ##STR6## wherein R 1 and R 2 are selected from the group consisting of chlorine, methyl and hydrogen; R 3 is the amino group or an imide group ##STR7## X is a linking entity selected from the group consisting of a valence bond, --O--, --S--, --C n H 2n -- wherein n is 1, 2, or 3, ##STR8##
Claim 3
Dependent Claim
27 words
The polymer composite of claim 1 wherein said fiber is selected from glass fibers, carbon fibers, boron nitride fibers, aramid fibers, alumina fibers, and silicon carbide fibers.
Claim 4
Dependent Claim
13 words
The polymer composite of claim 1 wherein said imide has the structure ##STR9##
Claim 5
Dependent Claim
13 words
The polymer composite of claim 3 wherein R 3 is the amino group.
Claim 6
Dependent Claim
27 words
The polymer composite of claim 4 wherein said fiber is selected from glass fibers, carbon fibers, boron nitride fibers, aramid fibers, alumina fibers, and silicon carbide fibers.
Claim 7
Dependent Claim
15 words
The polymer composite of claim 5 wherein R 1 and R 2 are each H.
Claim 8
Dependent Claim
12 words
The polymer composite of claim 6 wherein the fiber is aramid fiber.
Claim 9
Dependent Claim
13 words
The polymer composite of claim 3 wherein R 3 is the imide group.
Claim 10
Dependent Claim
27 words
The polymer composite of claim 8 wherein said fiber is selected from glass fibers, carbon fibers, boron nitride fibers, aramid fibers, alumina fibers, and silicon carbide fibers.
Claim 11
Dependent Claim
15 words
The polymer composite of claim 9 wherein R 1 and R 2 are each H.
Claim 12
Dependent Claim
12 words
The polymer composite of claim 10 wherein the fiber is aramid fiber.
Claim 13
Dependent Claim
13 words
The polymer composite of claim 1 wherein said imide has the structure ##STR10##
Claim 14
Dependent Claim
13 words
The polymer composite of claim 12 wherein R 3 is the amino group.
Claim 15
Dependent Claim
31 words
The polymer composite of claim 13 wherein X is ##STR11## and said fiber is selected from glass fibers, carbon fibers, boron nitride fibers, aramid fibers, alumina fibers, and silicon carbide fibers.
Claim 16
Dependent Claim
22 words
The polymer composite of claim 14 wherein R 1 and R 2 are each H and the benzene rings are not substituted.
Claim 17
Dependent Claim
12 words
The polymer composite of claim 15 wherein the fiber is aramid fiber.
Claim 18
Dependent Claim
13 words
The polymer composite of claim 12 wherein R 3 is the imide group.
Claim 19
Dependent Claim
31 words
The polymer composite of claim 17 wherein X is ##STR12## and said fiber is selected from glass fibers, carbon fibers, boron nitride fibers, aramid fibers, alumina fibers, and silicon carbide fibers.
Claim 20
Dependent Claim
22 words
The polymer composite of claim 18 wherein R 1 and R 2 are each H and the benzene rings are not substituted.
Claim 21
Dependent Claim
12 words
The polymer composite of claim 19 wherein the fiber is aramid fiber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |