U.S. Philips Corporation

Claude Morhaim

Hugues Baudry

Marc A Monneraye

Hughes Baudry

Dominique Bricout

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.

Glass-ceramic heating element

The invention relates to a silk screen printing paste which is provided according to the thick-layer technique and is to be fired in a non-oxidizing atmosphere and which comprises a mixture of a vitreous passive component and a permanent binder, an active component and a temporary binder, characterized in that it also comprises one or more lead oxide(s) having a degree of oxidation higher than 2 in a quantity below 20% by volume. The invention also relates to hybrid circuits manufactured by means of said paste. Application: hybrid micro-circuits.

Silk screen printing paste with lead glass which is to be fired in a

Dielectric composition, screen printing paste having such a composition and products obtained. The invention describes a dielectric composition which may be used in particular as an insulating screen-printing paste, which is compatible with a copper-containing conductive screen-printed layer, the paste containing, dispersed in an organic vehicle, a mixture of ceramic phases, consisting essentially of zinc oxide and cobalt oxide, and a vitreous phase containing at least a glass which can be devitrified by dissolving the zinc oxide.

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Paris, France

Claude Morhaim