# US 11,112,219 B2 · Multi-curve steel body armor and method of manufacturing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,219 B2 - Document ID: US11112219B2 - Status: Granted - Kind: B2 - Application number: 16/025,522 - Filed: 2018-07-02 - Published: 2019-01-17 - Granted: 2021-09-07 - Earliest claimed: 2015-02-02 - Assignees: Tk Armor Systems, L.L.C. - Applicants: Tk Armor Systems, L.L.C. - Inventors: Jeremy Tepper - Web page: https://patentgrep.com/patent/US11112219B2 ## CPC - F41H 5/045: {all the layers being metal layers} - B21D 5/02: on press brakes without making use of clamping means - F41H 1/02: Armoured or projectile- or missile-resistant garments; Composite protection fabrics {(F41H5/04 takes precedence)} - F41H 5/02: Plate construction - F41H 5/023: {Armour plate, or auxiliary armour plate mounted at a distance of the main armour plate, having cavities at its outer impact surface, or holes, for deflecting the projectile} - F41H: ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL - B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F) ## Abstract A steel armor plate and method of manufacturing is described. The armor plate has three curves, a first curve about an axis that parallels the length of the armor plate, and two additional curves about axes that parallel the width of the armor plate. A die for manufacturing said plate is described, the die being formed of a stack of metal plates, each plate having a curve that substantially matches the first curve, the stack of plates being arranged in a step-down-then-step-up fashion to form a concavity that approximates one of the two additional curves. ## Claims ### Claim 1 An armor plate, comprising a convex first surface, a concave opposing second surface, a first end, an opposing second end, a long dimension, and a transverse short dimension, wherein the plate further comprises: a first bend about a longitudinal axis symmetrically disposed along said long dimension having a first radius of curvature; a second bend about a first transverse axis parallel to the short dimension having a second radius of curvature; and a third bend about a second transverse axis, which is parallel to the short dimension and spaced apart from the first transverse axis along the long dimension, having a third radius of curvature. ### Claim 2 (depends on 1) The plate of claim 1, wherein the plate includes cut corners at the first end forming an upper trapezoidal portion of the plate with an integral rectangular portion extending to said opposing second end, and wherein the cut corners are concave out. ### Claim 3 (depends on 1) The plate of claim 1, wherein the plate contains rounded corners at the opposing second end. ### Claim 4 (depends on 1) The plate of claim 1, wherein the second bend is disposed near the first and the third bend is disposed near the second opposing end. ### Claim 5 (depends on 4) The plate of claim 4, wherein the first transverse axis defines a long side of the trapezoidal portion and the second radius of curvature is formed at the long side of said trapezoidal portion. ### Claim 6 (depends on 4) The plate of claim 4, wherein the second transverse axis is disposed in between a bottom ¼th and ⅓rd of said rectangular portion and the second third radius of curvature is formed in between a bottom ¼th and ⅓rd of said rectangular portion. ### Claim 7 (depends on 1) The plate of claim 1, wherein the first radius of curvature is different either from the second radius of curvature or the third radius of curvature. ### Claim 8 (depends on 1) The plate of claim 1, wherein the second radius of curvature equals the third radius of curvature. ### Claim 9 (depends on 1) The plate of claim 1, wherein the long dimension has a length ranging from 10 inches to 14 inches. ### Claim 10 (depends on 1) The plate of claim 1, wherein the transverse short dimension has a length ranging from 8 inches to 10 inches. ### Claim 11 (depends on 1) The plate of claim 1, wherein the plate is formed from ballistic resistant steel. ### Claim 12 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a Brinell hardness between 505 and 515. ### Claim 13 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a Brinell hardness between 545 and 560. ### Claim 14 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel is AR500 steel. ### Claim 15 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel is AR550 steel. ### Claim 16 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel is AR650 steel. ### Claim 17 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a thickness between 3/16 inches and 0.25 inches. ### Claim 18 (depends on 1) The plate of claim 1, further comprising a coating comprising polyuria elastomers. ### Claim 19 (depends on 18) The plate of claim 18, wherein the coating has a thickness of 0.25 inches. ### Claim 20 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a Brinell hardness equal to or greater than 400 and less than or equal to 505. ### Claim 21 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a Brinell hardness equal to or greater than 495 and less than or equal to 505. ### Claim 22 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a Brinell hardness equal to or greater than 515 and less than or equal to 545. ### Claim 23 (depends on 11) The plate of claim 11, wherein the ballistic resistant steel has a Brinell hardness equal to or greater than 560 and less than or equal to 600.