# US 11,441,040 B2 · Electronic device housings > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,040 B2 - Document ID: US11441040B2 - Status: Granted - Kind: B2 - Application number: 16/605,761 - Filed: 2017-04-21 - Published: 2021-04-29 - Granted: 2022-09-13 - Earliest claimed: 2017-04-21 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: David H Hanes - Web page: https://patentgrep.com/patent/US11441040B2 ## CPC - G01K 11/12: using changes in colour, translucency or reflectance - C09B 9/00: Esters or ester-salts of leuco compounds of vat dyestuffs - C09D 5/26: Thermosensitive paints - C09D 5/29: for multicolour effects - C09D 7/40: Additives - G08B 5/00: Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied - G08B 21/182: {Level alarms, e.g. alarms responsive to variables exceeding a threshold} - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) - C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS ## Abstract The present disclosure is drawn to an electronic device housing that can include a heat sensitive coating and a second heat sensitive coating applied to an electronic device housing. The heat sensitive coating or portion thereof can include a thermochromatic colorant having a color-changing activation temperature, and the second heat sensitive coating or portion thereof can include a second thermochromatic colorant having a second color-changing activation temperature. The color-changing activation temperature can be a temperature from 30° C. to about 100° C., and the second color-changing activation temperature can be at least 5° C. greater than the color-changing activation temperature. ## Claims ### Claim 1 An electronic device housing, comprising: a heat sensitive coating applied to an electronic device housing surface, the heat sensitive coating or portion thereof comprising a thermochromatic colorant having a color-changing activation temperature; and a second heat sensitive coating applied to the electronic device housing surface, the second heat sensitive coating or portion thereof comprising a second thermochromatic colorant having a second color-changing activation temperature; wherein the color-changing activation temperature is at a temperature from 30 to about 100° C., and the second color-changing activation temperature is at least 5 c′e, greater than the color-changing activation temperature; and wherein the second color-changing activation temperature is within 10° C. of an electric device's overheated operating temperature that the housing is sized and shaped to hold therein. ### Claim 2 (depends on 1) The electronic device housing of claim 1, wherein the thermochromatic colorant is a reversible thermochromatic colorant, and the second thermochromatic colorant is an irreversible thermochromatic colorant. ### Claim 3 (depends on 1) The electronic device housing of claim 1, wherein the thermochromatic colorant is a reversible thermochromatic colorant, and the second thermochromatic colorant is also a reversible thermochromatic colorant. ### Claim 4 (depends on 1) The electronic device housing of claim 1, wherein the heat sensitive coating and the second heat sensitive coating are applied to the electronic device housing surface as a multi-layered color-changing composite. ### Claim 5 (depends on 1) The electronic device housing of claim 1, wherein the heat sensitive coating and the second heat sensitive coating are applied to the electronic device housing surface laterally adjacent to one another. ### Claim 6 (depends on 1) The electronic device housing of claim 1, Wherein the heat sensitive coating, the second heat sensitive coating, or both, are coated with a clear protective overcoat. ### Claim 7 (depends on 1) The electronic device housing of claim 1, wherein the electronic device housing is shaped to contain electronic components for a laptop, a desktop console, a video game console, a computer mouse, a keyboard, a keycap, a printer, a monitor, a speaker, a head set, a set of head phones, a television, a camera, a flash drive, a hard drive, a smart watch, a smart phone, a watch band, a fitness tracker, or a combination thereof. ### Claim 8 (depends on 7) The electronic device housing of claim 7, wherein the second thermochromatic colorant is an irreversible thermochromatic colorant and the second color-changing activation temperature corresponds to a maximum operating temperature for the electronic device that the housing is sized and shaped to hold.