Patent ID: 7240416

Claim:
A method of forming a device comprised of a predetermined pattern of discrete relatively electrically conductive regions and relatively electrically resistive regions, the method comprising a step of: working a sheet of electrically conductive material to remove predetermined portions therefrom to form said one or more discrete relatively conducting regions, wherein said sheet of electrically conductive material has a thickness no greater than about 100 microns, wherein the step of working the sheet includes a step of pressing the sheet of electrically conductive material using a pressing means to form a predetermined pattern of raised portions therein, wherein the working step comprises using an embossing tool, wherein the sheet of electrically conductive material is a planar sheet that is mountable relative to the embossing tool in the pressing means, wherein during the working step the sheet is placed above and on the embossing tool and a layer of backing material is then placed on top of the sheet before operation of the pressing means, wherein the embossing tool with the embossed sheet and layer of backing material positioned thereon, are relatively removable from within the pressing means.