Production of conducting layers upon electrical resistors

Claim 1

A PROCESS FOR IMPRINTING A CIRCUIT ELEMENT UPON A SUBSTANTIALLY SMOOTH SURFACE OF ELECRICAL INSULATING SYNTHETIC PLASTIC MATERIAL WHICH COMPRISES APPLYING TO THE SURFACE THEREOF, A SLURRY OF FINELY DIVIDED CIRCUIT ELEMENT FORMING PARTICLES IN A VOLATILE LIQUID THAT IS INERT TO THE PLASTIC, APPLYING SIMULTANEOUSLY TO AT LEAST ONE SELECTED AREA OF SAID SLURRY COVERED PLASTIC AND PRIOR TO COMPLETION OF EVAPORATION OF SAID VOLATILE LIQUID THEREFROM, MECHANICAL PRESSURE AND HEAT TO CAUSE THE INDIVIDUAL PARTICLES TO COHERE AND TO BECOME AT LEAST PARTILLY EMBEDDED IN THE UNDERLYING INSULATING MATERIAL WITHOUT SUBSTANTIALLY IMPAIRING THE ELECTRICAL PROPERTIES OF THE SURFACE OF THE SELECTED AREA OF SAID MATERIAL AND THEREAFTER REMOVING ELECTRICAL CONDUCTOR FROM THOSE AREAS OF SAID COVERED PLASTIC TO WHICH SAID PRESSURE AND HEAT HAVE NOT BEEN APPLIED.