Method of producing two-dimensional circuits or circuit elements on supporting bases

Claim 1

PROCESS OF PRODUCING A PRINTED CIRCUIT PRODUCT INCLUDING AN INSULATING BASE LAYER AND AN ADHERENT ELECTRICALLY CONDUCTIVE PRINTED CIRCUIT PATTERN ON SAID INSULATING BASE LAYER, WHICH COMPRISES THE STEPS OF APPLYING ONTO SAID INSULATING BASE LAYER AN ADHERENT WATER SOLUBLE AQUEOUS COLLOID COATING CONTAINING A DICHROMATE PHOTOSENSITIZER AND ADDING TO SAID COATING A COLLOIDALLY DISPERSED SUSPENSION OF ELECTRICALLY CONDUCTIVE FINELY DIVIDED POWDERED MATERIAL OF THE CLASS CONSISTING OF ELECTRICALLY CONDUCTIVE METAL AND ELECTRICALLY CONDUCTIVE CARBON, IN AMOUNT SUFFICIENT TO IMPART ELECTRICAL CONDUCTIVITY TO THE COATING EXPOSING THE PHOTO-SENSITIVE COATING TO IRRADIATION THROUGH A NEGATIVE OF THE DESIRED CIRCUIT PATTERN AND THUS RENDERFORMING AN ELECTRICALLY CONDUCTIVE ADHERENT CIRCUIT PATTERN ON SAID BASE LAYER FROM THE IRRADIATED PORTION OF THE PHOTO-SENSITIVE COATING BY WASHING AWAY THE UNEXPOSED PORTIONS OF SAID LEAVING SAID IRRADIATED PORTIONS ADHERING WITH WATER AND LEAVING SAID IRRADIATED PORTIONS ADHERING TO THE INSULATING BASE LAYER.