US4567100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced entry and ballistic resistant laminar structure
Assignee: United States Department of the Navy
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Filing: 1983-08-22
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Granted: 1986-01-28
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Expires: 2003-08-22
Abstract
Abstract A laminar system for constructing doors and window shutters, to harden thenside of walls and to greatly increase the penetration resistance of structures. The sketch illustrates the material system and gives representative material thicknesses. The laminar system comprises an outer steel sheet, hardwood, polycarbonate plastic, a ballistic resistant (hardened steel) sheet, and an inner sheet of steel; the materials are laminated in the order given from the outside (attack side) to the inside. This laminar materials systems (used as a 3 foot wide by 7 foot high door, for example) provides greater penetration and ballistic resistance with lighter weight than prior systems.
Inventors
- 👤 Teddy L. Pickett
- 👤 Gary R. Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:21
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/04; B32B21/08; B32B15/00; B32B15/04; B32B15/08; B32B15/09; B32B15/10; B32B27/00; B32B27/36; B32B27/365; B32B7/00; B32B7/04; B32B7/12; E; E04; E04H; E04H9/00; E04H9/04; E04H9/10; E06; E06B; E06B5/00; E06B5/10; E06B9/00; E06B9/02; F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0442; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2571/00; B32B2571/02; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31507; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31678; Y10T428/31703
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
166 words
A composite laminar panel structure capable of resisting penetration from attack by cutting tools, heat, small arms, projectiles and explosive forces, consisting in order of sequence from an attack side to the back side of the panel structure: a. a first relatively thin metal sheet which faces the direction of attack; b. a relatively thick layer of penetration and flame resistant hardwood disposed behind and adhered to said first metal sheet; said hardwood layer being chemically treated to reduce flamability thereof and delay thermal attack tools; c. a high ballistic resistant and flame resistant plastic sheet disposed and adhered to said panel of hardwood; d. a second metal sheet consisting of a relatively thin layer of armor plate metal disposed behind and adhered to said high ballistic resistant plastic layer; said sequence of materials laminated in said specific order from the attack side of the panel structure providing a laminar wall system having higher penetration resistance over comparable thickness and weight prior ballistic resistant wall structures.
Claim 2
Dependent Claim
166 words
A composite laminar panel structure capable of resisting penetration from attack by cutting tools, heat, small arms, projectiles and explosive forces, consisting in order of sequence from an attack side to the back side of the panel structure: a. a first relatively thin metal sheet which faces the direction of attack; b. a relatively thick layer of penetration and flame resistant hardwood disposed behind and adhered to said first metal sheet; said hardwood layer being chemically treated to reduce flamability thereof and delay thermal attack tools; c. a high ballistic resistant and flame resistant plastic sheet disposed and adhered to said panel of hardwood; d. a second metal sheet consisting of a relatively thin layer of armor plate metal disposed behind and adhered to said high ballistic resistant plastic layer; said sequence of materials laminated in said specific order from the attack side of the panel structure providing a laminar wall system having higher penetration resistance over comparable thickness and weight prior ballistic resistant wall structures.
Claim 3
Dependent Claim
22 words
A composite laminar panel structure as in claim 1, wherein: said various laminar layers are connected together with a structural epoxy adhesive.
Claim 4
Dependent Claim
16 words
A composite laminar panel structure as in claim 1, wherein: said layer of hardwood is oak.
Claim 5
Dependent Claim
17 words
A composite laminar panel structure as in claim 1, wherein: said bullet resistant plastic is polycarbonate plastic.
Claim 6
Dependent Claim
18 words
A composite laminar panel structure as in claim 1, wherein: said armor plate metal is double air-hardened steel.
Claim 7
Dependent Claim
30 words
A composite laminar panel structure as in claim 1, wherein: a third metal sheet is adhered to said second metal sheet at the back side of said laminar panel structure.
Claim 8
Dependent Claim
18 words
A composite laminar panel structure as in claim 1, wherein: said first metal sheet is medium-carbon cold-rolled steel.
Claim 9
Dependent Claim
18 words
A composite laminar panel structure as in claim 1, wherein: said third metal sheet is 11 gauge steel.
Claim 10
Dependent Claim
51 words
A composite laminar panel structure as in claim 1, wherein: said first metal sheet is 11 gauge steel, said layer of hardwood is approximately 11/2 inches in thickness, said bullet resistant plastic layer is 1/2 inch thick polycarbonate plastic, said armor plate metal is approximately 3/16 inch thick double air-hardened steel.
Claim 11
Dependent Claim
206 words
A composite laminar panel structure capable of resisting penetration from attack by cutting tools, heat, small arms, projectiles, and explosive forces, consisting in order of sequence from an attack side to the back side of the panel structure: a. a first layer of 11 gauge steel sheet metal which faces the direction of attack; b. a second layer of penetration and flame resistant hardwood of approximately 1.5 inches thickness disposed behind and adhered to said first metal sheet; said hardwood layer being chemically treated to reduce flamability thereof and delay thermal attack tools; c. a high ballistic resistant and flame resistant polycarbonate plastic third layer of approximately 0.5 inch thickness disposed behind and adhered to said hardwood layer; d. a fourth layer consisting of a second metal sheet of armor plate steel of approximately 3/16 inch thickness disposed behind and adhered to the back of said high ballistic resistant and flame resistant plastic layer; e. said various laminar layers being laminated together with a structural epoxy adhesive; said sequence of material layers in specific order from the attack side to the back side of the panel structure providing a laminar wall system having higher penetration resistance over comparable thickness and weight prior ballistic resistant wall structures.
Claim 12
Dependent Claim
206 words
A composite laminar panel structure capable of resisting penetration from attack by cutting tools, heat, small arms, projectiles, and explosive forces, consisting in order of sequence from an attack side to the back side of the panel structure: a. a first layer of 11 gauge steel sheet metal which faces the direction of attack; b. a second layer of penetration and flame resistant hardwood of approximately 1.5 inches thickness disposed behind and adhered to said first metal sheet; said hardwood layer being chemically treated to reduce flamability thereof and delay thermal attack tools; c. a high ballistic resistant and flame resistant polycarbonate plastic third layer of approximately 0.5 inch thickness disposed behind and adhered to said hardwood layer; d. a fourth layer consisting of a second metal sheet of armor plate steel of approximately 3/16 inch thickness disposed behind and adhered to the back of said high ballistic resistant and flame resistant plastic layer; e. said various laminar layers being laminated together with a structural epoxy adhesive; said sequence of material layers in specific order from the attack side to the back side of the panel structure providing a laminar wall system having higher penetration resistance over comparable thickness and weight prior ballistic resistant wall structures.
Claim 13
Dependent Claim
14 words
A composite laminar panel structure as in claim 10, wherein: said hardwood is oak.
Claim 14
Dependent Claim
17 words
A composite laminar panel as in claim 10, wherein: said armor plate metal is double air-hardened steel.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |