# US 12,225,637 B1 · Curved surface heating device and method for forming three-dimensional patterns > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,637 B1 - Document ID: US12225637B1 - Status: Granted - Kind: B1 - Application number: 18/610,726 - Filed: 2024-03-20 - Granted: 2025-02-11 - Earliest claimed: 2024-03-20 - Assignees: Opas Technology Co., Ltd. - Applicants: Opas Technology Co., Ltd. - Inventors: Chun-Hua Yang - Web page: https://patentgrep.com/patent/US12225637B1 ## CPC - H05B 3/22: non-flexible - H05B 3/145: {Carbon only, e.g. carbon black, graphite} - H05B 3/34: flexible, e.g. heating nets or webs - H05B 3/84: Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A curved surface heating device comprising a curved panel-shaped protective layer, with a conductive layer formed on one side of the protective layer, wherein the conductive layer comprises a conductive metal or a carbon-based material, wherein a volume percentage of the conductive metal is between 30% and 60% and a volume percentage of the carbon-based material is between 30% and 60%, and wherein a thickness of the conductive layer is within 50 micrometers (μm). ## Claims ### Claim 1 A curved surface heating device, comprising: a protective layer having a curved panel shape and dielectric properties; a conductive layer formed on one side of the protective layer and having electrothermal properties, with a resistance value within 300Ω and a current withstand value of less than 20 A; the conductive layer comprising a high-conductivity material including a conductive metal or a carbon-based material, wherein a volume percentage of the conductive metal in the high-conductivity material is between 30% and 60%, and a volume percentage of the carbon-based material in the high-conductivity material is between 30% and 60%, and a thickness of the conductive layer is within 50 micrometers (μm); a temperature control insulation layer on one side of the conductive layer opposite to the protective layer and comprising the carbon-based material in a volume percentage between 30% and 60%, and the conductive metal, with a volume percentage between 10% and 25%; and at least one conductive wire electrically connected to the temperature control insulation layer; wherein the at least one conductive wire maintains a temperature between 30° C. and 100° C., and the conductive metal of the temperature control insulation layer receives an electric current from the at least one conductive wire and transmits the current to the conductive layer. ### Claim 2 (depends on 1) The curved surface heating device according to claim 1, wherein the conductive layer is formed on a concave surface of the protective layer. ### Claim 3 (depends on 1) The curved surface heating device according to claim 1, wherein the protective layer is a plastic curved panel shape or a glass curved panel shape. ### Claim 4 (depends on 3) The curved surface heating device according to claim 3, wherein the conductive layer comprises a conductive pattern. ### Claim 5 (depends on 1) The curved surface heating device according to claim 1, wherein the conductive metal and/or the carbon-based material of the conductive layer is granular, flaky, or in the form of short fibers. ### Claim 6 (depends on 5) The curved surface heating device according to claim 5, wherein the transmittance of the conductive layer is over 80%. ### Claim 7 (depends on 6) The curved surface heating device according to claim 6, wherein a bonding layer is disposed between the protective layer and the conductive layer, and the bonding layer has dielectric properties and an area slightly larger than that of the conductive layer, and the bonding layer is a film or an adhesive, wherein at least a portion of the bonding layer is in contact with the periphery of one side of the conductive layer in the thickness direction. ### Claim 8 (depends on 7) The curved surface heating device according to claim 7, wherein the bonding layer and the conductive layer jointly form a plane. ### Claim 9 (depends on 6) The curved surface heating device according to claim 6, further comprising an insulation layer bonded to the protective layer, the insulation layer comprising an enveloping structure enveloping the bonding layer, the conductive layer, and the temperature control insulation layer, having dielectric properties and high temperature resistance, wherein the insulation layer is a film, a shell, or a curing adhesive. ### Claim 10 (depends on 1) A method of forming the curved surface heating device of claim 1, comprising the steps of: preparing the protective layer; providing a carrier, wherein the curved panel shape of the protective layer corresponds to a shape of the carrier; placing the conductive layer on an upper surface of a base; applying pressure to the carrier toward the upper surface so that the carrier covers the conductive layer and at least a portion of the carrier contacts the upper surface of the base; attaching the conductive layer to the carrier; positioning the conductive layer with the carrier against the protective layer and leaving the conductive layer on one side of the protective layer; and placing the temperature control insulation layer on one side of the conductive layer opposite to the protective layer. ### Claim 11 (depends on 10) The method of claim 10, wherein the upper surface of the base is concavely provided with a conductive recess, and the conductive layer is placed in the conductive recess to form a conductive pattern with a thickness corresponding to the depth of the conductive recess. ### Claim 12 (depends on 10) The method of claim 10, wherein the conductive layer is a conductive adhesive material, and is attached to the carrier in a solidified or a semi-solidified state. ### Claim 13 (depends on 11) The method of claim 11, wherein the carrier is a block with elastic deformation properties. ### Claim 14 (depends on 12) The method of claim 12, wherein the conductive layer is attached to the surface of the carrier by the method of electrostatic adsorption, inherent tackiness of the conductive layer, or vacuum adsorption. ### Claim 15 (depends on 13) The method of claim 13, wherein one side of the protective layer is first provided with a bonding layer before being bonded to the conductive layer. ### Claim 16 (depends on 13) The method of claim 13, wherein the protective layer is first mixed with a bonding layer before being placed on the base. ### Claim 17 (depends on 13) The method of claim 13, wherein the one side is a concave surface of the protective layer.