# US 5,707,688 A · Multi-color patterned cookware > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,688 A - Document ID: US5707688A - Status: Granted - Kind: A - Application number: 08/482,373 - Filed: 1995-06-07 - Granted: 1998-01-13 - Earliest claimed: 1994-12-22 - Assignees: E. I. Du Pont de Nemours and Company - Inventors: Kenneth Batzar; Lori Marie Mason - Web page: https://patentgrep.com/patent/US5707688A ## CPC - B05D 5/061: {Special surface effect} - A47J 36/025: {Vessels with non-stick features, e.g. coatings} - B05D 5/083: {involving the use of fluoropolymers} - Y10T 428/31544: Addition polymer is perhalogenated - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Cookware with a multi-layer, non-stick coating on its cooking surface has a random spattered pattern of raised dots or globules in an inner coat, which is applied by spraying at least two applications, with the first having more coverage and a darker color than the second. ## Claims ### Claim 1 A method of making an article of cookware having a cooking surface which comprises a multi-layer, non-stick fluoropolymer coating on a substrate which coating minimizes sticking by food residues and which is heat resisting by being stable at temperatures above 300.degree. C., wherein the multi-layer fluoropolymer coating comprises (1) a fluoropolymer primer coating adhered to the substrate, (2) a non-stick, heat-resisting, light-transmitting fluoropolymer topcoat coating, and (3) at least one optional fluoropolymer intermediate coating, said primer coating or said at least one fluoropolymer intermediate coating when it is present, having a first color or darkness, said method comprising; spraying at least two applications of globules as a discontinuous fluoropolymer coating onto the primer coating or optional at least one fluoropolymer intermediate coating when it is present, said globules having at least one color or darkness which is visibly different than said first color or darkness in said primer coating or said optional at least one fluoropolymer intermediate coating to which said discontinuous coating is applied as seen through said topcoat, with a first application of globules covering 30-80% of an area of said primer coating or said optional at least one fluoropolymer intermediate coating to which said first application is applied and a second application of globules covering 20-45% of the same area as said first application, with the second application covering at least 5% less area than the first. ### Claim 2 (depends on 1) The method of claim 1 wherein a third application is sprayed to a coverage of 10-35%, with the third application covering at least 5% less area than the second. ### Claim 3 (depends on 1) The method of claim 1 wherein the first application coverage is in the range of 45-65% and the second application coverage is in the range of 30-40%. ### Claim 4 (depends on 3) The method of claim 3 wherein the third application coverage is in the range of 15-30%. ### Claim 5 (depends on 1) The method of claim 1 wherein the globules contain TiO.sub.2 -coated mica. ### Claim 6 (depends on 1) A method of claim 1 in which the coatings are applied by spraying coating compositions successively on the substrate and ultimately heating the article to cure the coating, wherein either the primer coating or optional at least one fluoropolymer intermediate coating under the discontinuous coating is partially dried before applying the discontinuous coating so that substantial portions of the globules in the discontinuous coating remain on top of said under coating to create a texture or roughness in the topcoat. ### Claim 7 (depends on 1) A method of claim 1 wherein the discontinuous coating is sprayed on either the primer coating or optional at least one fluoropolymer intermediate coating while said primer coating or said optional at least one fluoropolymer intermediate coating if present is still wet enough so that the globules sink into said primer coating or said optional at least one fluoropolymer intermediate coating and the final topcoat is substantially smooth. ### Claim 8 (depends on 1) The method of claim 1 in which the discontinuous coating is sprayed onto the primer coating or optional at least one fluoropolymer intermediate coating if present at an angle such that the center of the spray stream relative to the substrate is in the range of 30 to 75 degrees, creating a spattered pattern of non-round globules. ### Claim 9 (depends on 8) The method of claim 8 wherein the angle is in the range of 45 to 60 degrees. ### Claim 10 (depends on 8) The method of claim 8 wherein each successive globule application is of a lighter color or darkness than the preceding globule application. ### Claim 11 (depends on 1) An article of cookware made by the method of claim 1.