US3930097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel compositions and process
Assignee: Pharmacia and Upjohn Co
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Filing: 1974-08-21
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Granted: 1975-12-30
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Expires: 1994-08-21
Abstract
Abstract OR A MIXTURE OF THESE. AND THE REMAINDER HAVE WHEREIN 10-90 PERCENT OF THE UNITS HAVE Heat resistant reinforced composites, including laminates, are described which comprise a reinforcing material and a polyimide, the latter being characterized by the recurring unit
Inventors
- 👤 Louis M Alberino
- 👤 Jr William J Farrissey
- 👤 James S Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:57
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995; Y10T428/30; Y10T428/31504; Y10T428/31721; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2721
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
30 words
A HEAT RESISTANT, REINFORCED COMPOSITE COMPRISING, IN COMBINATION, I. FROM ABOUT 21.5 PERCENT BY WEIGHT TO ABOUT 85 PERCENT BY WEIGHT OF A COPOLYIMIDE CONSISTING ESSENTIALLY OF THE RECURRING UNIT
Claim 2
Dependent Claim
30 words
A HEAT RESISTANT, REINFORCED COMPOSITE COMPRISING, IN COMBINATION, I. FROM ABOUT 21.5 PERCENT BY WEIGHT TO ABOUT 85 PERCENT BY WEIGHT OF A COPOLYIMIDE CONSISTING ESSENTIALLY OF THE RECURRING UNIT
Claim 3
Dependent Claim
13 words
A composite according to claim 1 in which the reinforcing material is fibrous.
Claim 4
Dependent Claim
15 words
A composite according to claim 1 in which the reinforcing material is chopped fiber glass.
Claim 5
Dependent Claim
15 words
A composite according to claim 1 in which the reinforcing material is chopped graphite fiber.
Claim 6
Dependent Claim
14 words
A composite according to claim 1 in which the reinforcing material is graphite powder.
Claim 7
Dependent Claim
15 words
A composite according to claim 1 in which the reinforcing material is molybdenum disulfide powder.
Claim 8
Dependent Claim
14 words
A composite according to claim 1 in which the reinforcing material is aluminum powder.
Claim 9
Dependent Claim
30 words
A heat resistant, reinforced composite comprising, in combination, (i) from about 21.5 percent by weight to about 85 percent by weight of a copolyimide consisting essentially of the recurring unit
Claim 10
Dependent Claim
30 words
A heat resistant, reinforced composite comprising, in combination, (i) from about 21.5 percent by weight to about 85 percent by weight of a copolyimide consisting essentially of the recurring unit
Claim 11
Dependent Claim
13 words
A composite according to claim 8 in which the reinforcing material is fibrous.
Claim 12
Dependent Claim
15 words
A composite according to claim 9 in which the reinforcing material is a glass fabric.
Claim 13
Dependent Claim
14 words
A composite according to claim 9 in which the reinforcing material is graphite fabric.
Claim 14
Dependent Claim
18 words
A composite according to claim 9 in which the reinforcing material is a high temperature resistant organic fabric.
Claim 15
Dependent Claim
14 words
A composite according to claim 9 in which the reinforcing material is fiber glass.
Claim 16
Dependent Claim
14 words
A composite according to claim 9 in which the reinforcing material is graphite fiber.
Claim 17
Dependent Claim
14 words
A composite according to claim 8 in which the reinforcing material is graphite powder.
Claim 18
Dependent Claim
24 words
A heat resistant reinforced laminate comprising a plurality of layers of a woven fibrous reinforcement embedded in a polyimide as defined in claim 8.
Claim 19
Dependent Claim
13 words
A laminate according to claim 16 wherein the reinforcement Is fiber glass cloth.
Claim 20
Dependent Claim
12 words
A laminate according to claim 16 wherein the reinforcement is graphite cloth.
Claim 21
Dependent Claim
16 words
A laminate according to claim 16 wherein the reinforcement is a high temperature resistant organic fabric.
Claim 22
Dependent Claim
71 words
A process for the preparation of a laminate comprising the steps of: (i) impregnating a plurality of layers of a woven fibrous reinforcement with a solution in an organic solvent of a polyimide as defined in claim 8; (ii) removing the organic solvent from said impregnated layers; and (iii) fusing said plurality of layers under pressure at a temperature at least as high as the glass transition temperature of said polyimide.
Claim 23
Dependent Claim
15 words
A process according to claim 20 wherein the woven fibrous reinforcement is fiber glass cloth.
Claim 24
Dependent Claim
14 words
A process according to claim 20 wherein the woven fibrous reinforcement is graphite cloth.
Claim 25
Dependent Claim
18 words
A process according to claim 20 wherein the woven fibrous reinforcement is a high temperature resistant organic fabric.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |