Patent ID: 7638208

Claim:
A glass ceramic plate formed to provide a cooking surface of a cooking unit, wherein said glass ceramic plate is composed of a glass ceramic material, which is transparent to visible light as well as IR radiation, and wherein said glass ceramic plate has a noble metal film coated on an underside of the glass ceramic plate and a grid-shaped decoration on a topside of the glass ceramic plate; and wherein the noble metal film comprises an alloy of gold and/or platinum and/or palladium, which imparts a reflective property to the noble metal film; the noble metal film contains from 90 to 100% by weight of at least one noble metal, in relation to a total amount of film material in the noble metal film, and from 0 to 5 percent by weight, in relation to a total metal content of the noble metal film, of silver, copper, silicon, bismuth and other metals that are not noble metals; and the glass ceramic plate coated with the noble metal film has a spectral transmission of 0 to 4% in the visible region of the spectrum.