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US4820568A
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US
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Composite and article using short length fibers
Assignee: Honeywell International Inc
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Filing: 1987-08-03
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Granted: 1989-04-11
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Expires: 2007-08-03
Abstract
Abstract The present invention is an improved prepreg layer, multilayer composite based on the improved prepreg layer, and article made from the multilayer composite. The prepreg layer of the present invention comprises an array of at least two adjacent, coplanar fibrous elements. Each element comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers are up to eight inches, preferably one to eight inches, and more preferably two to six inches long. The prepreg layer of the present invention is useful to make a multilayer composite comprising a plurality of the prepreg layers as recited above. The fibers of adjacent layers are at an angle of about 90° from each other. The composite preferably has 2 to 500, more preferably 10 to 150, and most preferably 60 to 120 layers.
Inventors
- 👤 Gary A. Harpell
- 👤 H. L. Li
- 👤 Y. D. Kwon
- 👤 D. C. Prevorsek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:31
CPC Classifications
F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0471; F41H5/0485; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29C70/14; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29K2105/101; B29K2105/108; B29L; B29L2031/00; B29L2031/48; B29L2031/4807; B29L2031/4814; B29L2031/4821; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/911; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/24752; Y10T442/00; Y10T442/30; Y10T442/3065
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
45 words
A prepreg layer comprising an array of at least two adjacent coplanar fibrous elements, with each element comprising a plurality of unidirectional fibers embedded in a polymeric matrix, the fibers being up to eight inches in length, the adjacent elements connected by the polymer matrix.
Claim 2
Dependent Claim
45 words
A prepreg layer comprising an array of at least two adjacent coplanar fibrous elements, with each element comprising a plurality of unidirectional fibers embedded in a polymeric matrix, the fibers being up to eight inches in length, the adjacent elements connected by the polymer matrix.
Claim 3
Dependent Claim
18 words
The prepreg layer as recited in claim 1 wherein the fibers are from one to eight inches long.
Claim 4
Dependent Claim
20 words
The prepreg layer as recited in claim 2 wherein the fibers are from about two to about six inches long.
Claim 5
Dependent Claim
31 words
The prepreg layer as recited in claim 1 wherein the fibers have a tensile modulus of at least about 160 g/denier and an energy to break of at least 7 J/g.
Claim 6
Dependent Claim
63 words
A multilayer composite comprising a plurality of prepreg layers where each prepreg layer comprises an array of at least two adjacent coplanar fibrous elements, with each element comprising a plurality of unidirectional fibers embedded in a polymeric matrix, the fibers being up to eight inches in length and the fibers of adjacent layers being of an angle of about 90° from each other.
Claim 7
Dependent Claim
63 words
A multilayer composite comprising a plurality of prepreg layers where each prepreg layer comprises an array of at least two adjacent coplanar fibrous elements, with each element comprising a plurality of unidirectional fibers embedded in a polymeric matrix, the fibers being up to eight inches in length and the fibers of adjacent layers being of an angle of about 90° from each other.
Claim 8
Dependent Claim
23 words
The composite as recited in claim 5 wherein the fibers of the prepreg layers are from about one to about eight inches long.
Claim 9
Dependent Claim
23 words
The composite as recited in claim 6 wherein the fibers of the prepreg layers are from about two to about six inches long.
Claim 10
Dependent Claim
31 words
The composite as recited in claim 5 wherein the adjacent elements connected along element boundaries by the polymer matrix and the element boundaries of alternate layers being offset from each other.
Claim 11
Dependent Claim
34 words
The composite as recited in claim 5 wherein the fibers of the prepreg layers have a tensile modulus of at least about 160 g/denier and an energy to break of at least 7 J/g.
Claim 12
Dependent Claim
16 words
The composite as recited in claim 5 wherein there are from 2 to 500 prepreg layers.
Claim 13
Dependent Claim
15 words
The composite as recited in claim 10 wherein there are from 10 to 150 layers.
Claim 14
Dependent Claim
65 words
An article comprising a multilayer composite comprising a plurality of prepreg layers, where each prepeg layer comprises an array of at least two adjacent fibrous elements, with each element comprising a plurality of unidirectional fibers embedded in a polymeric matrix, the fibers being up to eight inches in length and the fibers of adjacent layers being at an angle of about 90° from each other.
Claim 15
Dependent Claim
65 words
An article comprising a multilayer composite comprising a plurality of prepreg layers, where each prepeg layer comprises an array of at least two adjacent fibrous elements, with each element comprising a plurality of unidirectional fibers embedded in a polymeric matrix, the fibers being up to eight inches in length and the fibers of adjacent layers being at an angle of about 90° from each other.
Claim 16
Dependent Claim
23 words
The article as recited in claim 12 wherein the fibers of the prepreg layers are from about one to about eight inches long.
Claim 17
Dependent Claim
23 words
The article as recited in claim 13 wherein the fibers of the prepreg layers are from about two to about six inches long.
Claim 18
Dependent Claim
31 words
The article as recited in claim 12 wherein the adjacent elements connected along element boundaries by the polymer matrix and the element boundaries of alternate layers being offset from each other.
Claim 19
Dependent Claim
33 words
The article as recited in claim 12 wherein the fibers of the prepreg layers have a tensile modulus of at least about 500 g/denier and an energy break of at least 22 J/g.
Claim 20
Dependent Claim
16 words
The article as recited in claim 12 wherein there are from 2 to 500 prepreg layers.
Claim 21
Dependent Claim
15 words
The article as recited in claim 17 wherein there are from 10 to 120 layers.
Claim 22
Dependent Claim
12 words
The article as recited in claim 12 wherein the article is planar.
Claim 23
Dependent Claim
13 words
The article as recited in claim 12 wherein the article is three dimensional.
Claim 24
Dependent Claim
13 words
The article as recited in claim 2 wherein the article is a helmet.
Claim 25
Dependent Claim
48 words
A multilayer composite comprising a plurality of prepreg layers where each prepreg layer comprises an array of at least two adjacent coplanar fibrous elements, with each element comprising a plurality of square woven fibers embedded in a polymeric matrix, the fibers being up to eight inches in length.
Claim 26
Dependent Claim
48 words
A multilayer composite comprising a plurality of prepreg layers where each prepreg layer comprises an array of at least two adjacent coplanar fibrous elements, with each element comprising a plurality of square woven fibers embedded in a polymeric matrix, the fibers being up to eight inches in length.
Claim 27
Dependent Claim
23 words
The composite as recited in claim 22 wherein the fibers of the prepreg layers are from about one to about eight inches long.
Claim 28
Dependent Claim
34 words
The composite as claimed in claim 22 wherein the fibers of the prepreg layers have a tensile modulus of at least about 160 g/denier and an energy to break of at least 7 J/g.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |