US4181768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Body armor laminate
Assignee: EIDP Inc
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Filing: 1974-10-31
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Granted: 1980-01-01
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Expires: 1994-10-31
Abstract
Abstract A laminate useful for body armor is prepared by press laminating alternate layers of a fabric from poly-(p-phenylene terephthalamide) and 6,6 nylon film to cause bonding together of the fabric layers into a rigid composite with only minimal flow of the film polymer into the yarn bundles of the fabric layers.
Inventors
- 👤 Gerard E. Severin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B37/00; B32B37/06; B32B37/10; B32B7/00; B32B7/04; B32B7/12; F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0471; F41H5/0478; B32B2571/00; B32B2571/02; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/27; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3528; Y10T442/3602; Y10T442/365
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
A laminate useful for body armor comprising alternate layers of a fabric woven from poly(p-phenylene terephthalamide) yarn with intervening layers of polyhexamethylene adipamide film, said fabric layers being bonded into a rigid composite by means of polymer of the film layers with only minimal presence of the film polymer in the yarn bundles of the fabric layers, the film constituting from about 10 to 30% by weight of the laminate and the fabric constituting from about 70 to 90% by weight of the laminate.
Claim 2
Dependent Claim
84 words
A laminate useful for body armor comprising alternate layers of a fabric woven from poly(p-phenylene terephthalamide) yarn with intervening layers of polyhexamethylene adipamide film, said fabric layers being bonded into a rigid composite by means of polymer of the film layers with only minimal presence of the film polymer in the yarn bundles of the fabric layers, the film constituting from about 10 to 30% by weight of the laminate and the fabric constituting from about 70 to 90% by weight of the laminate.
Claim 3
Dependent Claim
18 words
The laminate of claim 1 wherein the fabric has a weight of from about 5 to 20 oz./sq.yd.
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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |