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.

Abstract: 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.

Abstract: A portable identifying element has the general shape of a laminated credit card, and comprises a front sheet (6), a central sheet (1) and a rear sheet (6'), all of plastic material. An active electronic circuit (3) is positioned within a cavity (2) of the central sheet. A thin layer of copper (7) is juxtaposed with the electronic circuit between the front sheet and rear sheet for removing heat dissipated within the circuit.

Abstract: Method of providing metal bumps on an apertured substrate and substrate having metal bumps.

Abstract: A method for manufacturing a lead-through of a metal element consisting of a fernico alloy through a component of ceramic material. A suspension is supplied of glass powder having molar percentage compositions within defined limits. The suspension is deposited on the ceramic material at the area of the lead-through and the assembly is heated for several minutes in an nitrogen atmosphere at a temperature near 1000.degree. C. followed by cooling of the assembly to room temperature.

Abstract: A dielectric composition which may be used as an insulating silk-screening paste and is compatible with a copper-containing conductive silk-screened layer, such as used in multilayer circuit boards. The paste includes an organic carrier, a mixture of aluminum oxide, and one or more types of glass of the "short" type, of which at least one glass can be devitrified by dissolution of the aluminum oxide.