US4440819A
Expired / Lapsed
US
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Interconnection of unidirectional fiber arrays with random fiber networks
Assignee: Raytheon Co
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Filing: 1982-12-27
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Granted: 1984-04-03
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Expires: 2002-12-27
Abstract
Abstract Disclosed is a process for preparing novel multidirectional fiber arrays wherein graphite, glass or other fibers, in unidirectional arrays, are interconnected with polymer fibers. Production is accomplished by mechanical agitation of these unidirectional arrays in cooling polymer solutions. The interconnected material may subsequently be layered, impregnated with resin and laminated to yield unidirectional fiber/resin/polymer fiber composites.
Inventors
- 👤 Robin W. Rosser
- 👤 Leon B. Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:43
CPC Classifications
D; D04; D04H; D04H13/00; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249949
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
21 words
A multidirectional fiber array comprising high strength, high modulus unidirectional fibers interconnected with random fiber networks of high strength polymer fibers.
Claim 2
Dependent Claim
21 words
A multidirectional fiber array comprising high strength, high modulus unidirectional fibers interconnected with random fiber networks of high strength polymer fibers.
Claim 3
Dependent Claim
14 words
The array of claim 1 wherein the array of said unidirectional fibers is two-dimensional.
Claim 4
Dependent Claim
14 words
The array of claim 1 wherein the array of said unidirectional fibers is three-dimensional.
Claim 5
Dependent Claim
23 words
The array of claim 1 wherein said unidirectional fibers are selected from the group consisting of graphite fibers, glass fibers and mixtures thereof.
Claim 6
Dependent Claim
11 words
The array of claim 1 wherein polymer fibers are highly crystalline.
Claim 7
Dependent Claim
13 words
The array of claim 5 wherein said polymer fibers consist essentially of polypropylene.
Claim 8
Dependent Claim
25 words
The interconnected array of claims 1, 2, 3, 4, 5 or 6, further impregnated with a resin material and laminated to produce a composite material.
Claim 9
Dependent Claim
46 words
A process for preparing a multidirectional fiber array comprising unidirectional fibers, interconnected with high strength polymer fibers, which comprises placing unidirectional fibers in a solution comprising fiber-forming polymeric material in a solvent, and cooling the resultant solution while subjecting it to the application of sonic vibrations.
Claim 10
Dependent Claim
46 words
A process for preparing a multidirectional fiber array comprising unidirectional fibers, interconnected with high strength polymer fibers, which comprises placing unidirectional fibers in a solution comprising fiber-forming polymeric material in a solvent, and cooling the resultant solution while subjecting it to the application of sonic vibrations.
Claim 11
Dependent Claim
11 words
The process of claim 8 wherein said resultant solution is supercooled.
Claim 12
Dependent Claim
23 words
The process of claim 8 wherein said unidirectional fibers are selected from the group consisting of graphite fibers, glass fibers and mixtures thereof.
Claim 13
Dependent Claim
12 words
The process of claim 8 wherein said polymer fibers are highly crystalline.
Claim 14
Dependent Claim
12 words
The process of claim 8 wherein said solvent is a non-polymerizable solvent.
Claim 15
Dependent Claim
12 words
The process of claim 8 wherein said solvent is a polymerizable solvent.
Claim 16
Dependent Claim
10 words
The process of claim 12 wherein said solvent is xylene.
Claim 17
Dependent Claim
19 words
The process of claim 13 wherein said solution further includes an inhibitor material to retard polymerization of the solvent.
Claim 18
Dependent Claim
18 words
The process of claim 13 wherein said solvent is styrene and said fiber-forming polymeric material is isotactic polypropylene.
Claim 19
Dependent Claim
23 words
The process of claim 13 wherein said solvent is a mixture of styrene and methylmethacrylate and said fiber-forming polymeric material is isotactic polypropylene.
Claim 20
Dependent Claim
24 words
The process of claim 13 wherein said solvent is a mixture of styrene, methylmethacrylate and acrylonitrile and said fiber-forming polymeric material is isotactic polypropylene.
Claim 21
Dependent Claim
14 words
The process of claim 16, 17 or 18 wherein said solution further includes hydroquinone.
Claim 22
Dependent Claim
17 words
The process of claim 13 wherein the resultant solution contains a cross-linking agent for the polymerizable solvent.
Claim 23
Dependent Claim
13 words
The process of claim 20 wherein the fiber-forming polymeric material is a polyalkene.
References Cited (Backward Citations)
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US4144370A
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US4198561A
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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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |