# US 8,464,892 B2 · Food cooking appliance having a ferritic stainless steel bottom and a ferritic or austenitic stainless steel bowl > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,464,892 B2 - Document ID: US8464892B2 - Status: Granted - Kind: B2 - Application number: 12/489,203 - Filed: 2009-06-22 - Published: 2009-12-31 - Granted: 2013-06-18 - Earliest claimed: 2008-06-23 - Assignees: Seb S.A. - Applicants: Jean-Francois Marie Poty; Carole Audrey Alice Roche; Florence Bourdin - Inventors: Alain Gilles Bourdin; Jean-Francois Marie Poty; Carole Audrey Alice Roche - Web page: https://patentgrep.com/patent/US8464892B2 ## CPC - A47J 27/002: {Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels} - A47J 36/02: Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay - H05B 6/12: Cooking devices - A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract Food cooking appliance having a ferritic stainless steel bottom and a ferritic or austenitic stainless steel bowl intended to accommodate food and provided with a lower wall having an outer face; a ferritic stainless steel cup added on the outer face and fastened to the bowl, the cup forming a bottom (7) by which the cooking appliance is intended to rest on a cooking plate; patterns (8) engraved in the bottom (7); the appliance being characterized in that the engraving depth (P) of the patterns (8) and the density thereof on the bottom (7) are chosen so that the bottom (7) meets the requirements of the EN-12778 Standard of November 2002, and in that the stainless steel of the bowl is equally of ferritic or austenitic nature. ## Claims ### Claim 1 Food cooking appliance (1) comprising: an austenitic or ferritic stainless steel bowl (2) intended to accommodate food and provided with a lower wall (3) having an outer face (3B), a ferritic stainless steel cup (5) added on said outer face (3B) and fastened to said bowl (2), said cup (5) forming a bottom (7) by which said cooking appliance (1) is intended to rest on a cooking plate, patterns (8) engraved in said bottom (7) and having a depth (P) and a density, said appliance (1) being characterized in that the engraving depth (P) of said patterns (8) and the density thereof on the bottom (7) are chosen so that said bottom (7) meets the requirements of the EN-12778 Standard of November 2002 regardless of whether the stainless steel of the bowl be of ferritic or austenitic nature and said engraving depth (P) is between substantially 1.5% and 90% of the thickness of the cup (5), thereby preventing corrosion of said bowl. ### Claim 2 (depends on 1) Appliance (1) according to claim 1, in which said cup (5) is fastened to the bowl (2) by a stamping process. ### Claim 3 (depends on 1) Appliance (1) according to claim 1 and including an intermediate layer (6), with a thermal conductibility that is higher than that of the steel used for the bowl and cup, said intermediate layer (6) being interposed between the outer face (3A) of the lower wall (3) and the cup (5). ### Claim 4 (depends on 1) Appliance (1) according to claim 1 in which said patterns (8) have a repetitive character, so as to form a pavement. ### Claim 5 (depends on 4) Appliance (1) according to claim 4, in which said pavement is a Penrose pavement. ### Claim 6 (depends on 4) Appliance (1) according to claim 4, characterized in that said pavement is a honeycomb pavement. ### Claim 7 (depends on 1) Appliance (1) according to claim 1 in which said patterns (8) predominantly consist of engraved lines. ### Claim 8 (depends on 1) Appliance (1) according to claim 1 in which said patterns (8) comprise a plurality of oblong annular shapes (10) oriented radially with respect to a center of the cup (5). ### Claim 9 (depends on 1) Appliance (1) according to claim 1 in which said patterns (8) comprise a plurality of concentric circles (11), a center of which corresponds to that of the bottom (7) formed by the cup (5). ### Claim 10 (depends on 1) Appliance (1) according to claim 1 in which the density of the patterns (8) engraved in the bottom (7) is comprised between substantially 10% and 60%. ### Claim 11 (depends on 1) Appliance (1) according to claim 1 in which the engraving depth (P) of said patterns (8) is between 15% and 50% of the thickness of the cup (5). ### Claim 12 (depends on 1) Appliance (1) according to claim 1 in which said patterns have engraving lines having width (L) and a bottom, and the width (L) of the engraving line is comprised, at the line bottom, between substantially 0.1 and 3 mm. ### Claim 13 (depends on 12) Appliance (1) according to claim 12 in which said density is of about 20%, said width (L) at the line bottom is of about 1 mm, and the engraving depth (P) is of about 0.2 mm. ### Claim 14 (depends on 1) Appliance (1) according to claim 1 in which said patterns (8) are substantially regularly distributed over most of a surface of the bottom (7). ### Claim 15 (depends on 1) Appliance (1) according to claim 1 in which said appliance is a pressure cooker. ### Claim 16 (depends on 1) Appliance (1) according to claim 1 in which said patterns have engraving lines having width (L) and a bottom, and the width of the engraving line is comprised, at the line bottom between substantially 0.8 and 1.2 mm.