The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1990
Filed:
Nov. 14, 1988
Hughes Baudry, Varennes-Jarcy, FR;
Marc Monneraye, Saint-Maur-des-Fosses, FR;
Claude Morhaim, Paris, FR;
U.S. Philips Corp., New York, NY (US);
Abstract
Glass-ceramic heating element comprising at least a flat electric heating member which is provided on a glass-ceramic plate and can be heated to a temperature between ambient temperature and approximately 650.degree. C. forming a heat source, wherein the electric heating member is produced by depositing screen-printed layers on the surface denoted the lower surface to distinguish it from the working surface of the glass-ceramic plate, these layers having a coefficient of expansion near that of the glass-ceramic material at elevated temperatures and being capable of being heated by thermal dissipation to temperatures of about 650.degree. C., and wherein the heating member is formed from this lower surface by a first layer 21 of a material constituting an electric insulator at high tempertures, a second layer 22 of a conductive material to form the two current supply lines C.sub.1 and C.sub.2 for the input and the output of the heating member and a third layer 23 of a dielectric material to constitute a heating resistor R, arranged between the lines C.sub.1 and C.sub.2 in the form of a circuit of such a design that it can uniformly distribute the heat over the overall heat source surface. The heating element is suitable for use in hot plates, kitchen ranges and ovens.