Patent ID: 7244502

Claim:
An article of cookware comprising a substrate having a single-layer coating fused thereon, wherein the single-layer coating comprises a sintered mixture comprising: from about 2.5% to about 50% by weight of a fluorocarbon polymer component; and from about 50% to about 97.5% by weight of an enamel-forming component, wherein the enamel-forming component comprises at least a first lead-free and cadmium-free glass frit comprising by weight from about 30% to about 50% P 2 O 5 , from about 15% to about 30% Al 2 O 3 , from about 2% to about 40% X 2 O where X=Na and/or K, up to about 12% B 2 O 3 , up to about 10% ZnO, up to about 8% SiO 2 , up to about 5% Li 2 O, up to about 3% MnO, up to about 3% CoO, up to about 3% NiO, up to about 3% CuO, up to about 3% Sb 2 O 3 , up to about 3% Fe 2 O 3 , and up to about 3% MoO 3 .