Patent ID: 6525300
Filing Date: 2003-02-25
Classification: C03C,H05B

Abstract:
A cooking surface for cooking food comprising:a glass ceramic material comprising a crystallized and ceramicized glass; a heatable plate; cooking zones; marking for marking said cooking zones; said glass ceramic having a coefficient of thermal expansion over a substantial temperature range; said marking comprising a coating; said coating comprising a glass; said glass coating comprising a glass configured to have a coefficient of thermal expansion substantially different from said coefficient of thermal expansion of said glass ceramic; said glass coating being disposed on said glass ceramic surface, and said glass ceramic and said glass coating together having a mean tensile strength in bending which is maximized, and said glass coating comprising a pigment and comprising a non-toxic glass being configured to maximize adhesive strength to said glass ceramic; said glass coating comprising a glass configured to have a melting point which is minimized and configured to have an abrasive resistance which is maximized and configured to maximize adhesive strength to said glass ceramic; and said glass of said glass coating comprising less than 3% by weight calcium oxide, less than 5% by weight lithium oxide, and less than 1.5% by weight potassium oxide.