Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1988-11-14
1990-11-27
Envall, Jr., Roy N.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
338306, H05B 328
Patent
active
049738267
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.
REFERENCES:
patent: 3978316 (1976-08-01), Rose et al.
patent: 4323652 (1982-04-01), Baudry
patent: 4420338 (1983-12-01), Ortega
Baudry Hughes
Monneraye Marc
Morhaim Claude
Bartlett Ernestine C.
Envall Jr. Roy N.
U.S. Philips Corp.
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