# US 11,440,294 B2 · Heatable glazing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,294 B2 - Document ID: US11440294B2 - Status: Granted - Kind: B2 - Application number: 16/307,818 - Filed: 2017-05-31 - Published: 2019-10-03 - Granted: 2022-09-13 - Earliest claimed: 2016-06-08 - Assignees: Agc Glass Europe - Applicants: Agc Glass Europe - Inventors: Pavel Horak; Laurent Goutiere - Web page: https://patentgrep.com/patent/US11440294B2 ## CPC - B32B 17/10385: {for ohmic resistance heating} - B32B 17/10036: {comprising two outer glass sheets} - H05B 3/86: the heating conductors being embedded in the transparent or reflecting material {(H05B3/845 takes precedence)} - H05B 2203/011: Heaters using laterally extending conductive material as connecting means - H05B 2203/014: Heaters using resistive wires or cables not provided for in H05B3/54 - H05B 2203/017: Manufacturing methods or apparatus for heaters - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A laminated glazing comprising an assembly including (i) at least a thermoplastic interlayer, (ii) a first busbar laid over the thermoplastic interlayer, (iii) at least one heating wire laid over the first busbar, (iv) a second busbar at least partly laid over the heating wire and at least partly laid over the first busbar, (v) where a solder layer suitable for melting in an autoclave covers at least part of a surface of the first busbar or the second busbar and is arranged to contact the heating wire, and (vi) where the assembly is laminated with at least a glass sheet. ## Claims ### Claim 1 A laminated glazing comprising an assembly which comprises: at least a thermoplastic interlayer; a first busbar laid over the thermoplastic interlayer; at least one heating wire laid over the first busbar; and a second busbar at least partly laid over the heating wire and at least partly laid over the first busbar, wherein a solder layer suitable for melting in an autoclave covers at least part of a surface of the first busbar or the second busbar and is arranged to contact the heating wire, the assembly being laminated with at least a glass sheet, and wherein an adhesive layer is arranged between the first busbar and the second busbar on at least a part of a surface of the first busbar or the second busbar. ### Claim 2 (depends on 1) The glazing according to claim 1, wherein the assembly is laminated between two glass sheets. ### Claim 3 (depends on 1) The glazing according to claim 1, wherein an adhesive layer is arranged on at least a part of the surface of one of the first or the second busbar facing the other busbar. ### Claim 4 (depends on 1) The glazing according to claim 1, wherein the second busbar is covered on at least a part of the surface facing the first busbar with a solder layer and with an adhesive layer. ### Claim 5 (depends on 1) The glazing according to claim 1, wherein the adhesive layer is arranged on and all along a length of the first or second busbar and only on a portion of its width. ### Claim 6 (depends on 1) The glazing according to claim 1, wherein the first busbar is a low-melting point busbar and comprises a further adhesive layer on at least one part of its surface to be fixed to the thermoplastic interlayer. ### Claim 7 (depends on 1) The glazing according to claim 1, wherein an electric connection at wire extremities is configured in a superposition of the first busbar fixed to the thermoplastic interlayer, (ii) the at least one heating wire; (iii) the second busbar and an electric connector for a connection outside of the laminated glazing placed between the first and the second busbars or on the second busbar. ### Claim 8 (depends on 1) The glazing according to claim 1, wherein the first busbar is in contact with the thermoplastic interlayer and the second busbar is in contact with the glass sheet. ### Claim 9 (depends on 1) The glazing according to claim 1, wherein the glazing is a wired windshield. ### Claim 10 (depends on 1) The glazing according to claim 1, wherein the first or/and the second busbars are tinned copper strip. ### Claim 11 (depends on 1) The glazing according to claim 1, wherein the busbars have a width in a range 2 mm to 12 mm. ### Claim 12 (depends on 1) The glazing according to claim 1, wherein the at least a heating wire comprises an array of thin wires of tungsten extending across the glazing. ### Claim 13 A process for manufacture of a glazing, comprising: providing a thermoplastic interlayer, laying a first busbar on the thermoplastic interlayer, laying at least one heating wire over the first busbar, laying a second busbar over the heating wire and the first busbar, wherein a solder layer suitable for melting in an autoclave covers at least part of a surface of the first busbar or/and the second busbar and is arranged to contact the heating wire, and wherein an adhesive layer is arranged between the first busbar and the second busbar on at least a part of a surface of the first busbar or the second busbar. ### Claim 14 (depends on 13) The process according to claim 13, wherein an adhesive layer is arranged between the first busbar and the second busbar on at least a part of a surface of the first busbar or the second busbar. ### Claim 15 (depends on 13) The process according to claim 13, wherein the adhesive layer is arranged on at least a part of a surface of the second bulbar. ### Claim 16 (depends on 1) The glazing according to claim 1, wherein the busbars have a width from 4 mm to 10 mm. ### Claim 17 (depends on 1) The glazing according to claim 1, wherein the busbars have a width from 6 mm to 8 mm. ### Claim 18 (depends on 1) The glazing according to claim 1, wherein the solder layer has a melting temperature of no greater than 150° C. ### Claim 19 (depends on 13) The process according to claim 13, wherein the solder layer has a melting temperature of no greater than 150° C.