Electroconductive coating patterning

Claim 1

A METHOD OF MAKING AN ELECTRICAL RESISTIANCE DEVICE HAVING A PATTERNED FILM RESISTANCE ELEMENT ON A DIELECTRIC SUBSTRATE COMPRISING THE STEPS OF (A) PROVIDING A FLAT DIELECTRIC SUBSTRATE, (B) APPLYING A CONTINUOUS ADHERENT IRRIDIZED METALLIC OXIDE FILM DIRECTLY TO AT LEAST ONE SURFACE OF SAID SUBSTRATE, (C) APPLYING A LYER OF A MIXTURE OF POLYVINYL ALCOHOL AND POTASSIUM BICHROMATE TO SAID FILM, (D) DRYING SAID LAYER, (E) DISPOSING A MEMBER ADJACENT SAID LAYER, SAID MEMBER HAVING A LIGHT TRANSMITTING FIRST AREA CORRESPONDING IN SHAPE TO THE DESIRED RESISTANCE ELEMENT CONFIGURATION AND ARRANGEMENT AND A SUBSTANTIALLY OPAQUE SECOND AREA SURROUNDING SAID FIRST AREA, (F) ILLUMINATING THE ASSEMBLY SO FORMED WITH AN ULTRAVIOLET LIGHT FOR APPROXIMATELY 3 1/2 MINUTES, THEREBY EXPOSING AN AREA OF SAID LAYER CORRESPONDING IN SHAPE TO SAID FIRST AREA WHILE LEAVING THE REMAINDER OF SAID LAYER SUBSTANTIALLY UNEXPOSED, (G) REMOVING THE SAID MEMBER, (H) DIRECTING A WATER SPRAY TO SAID LAYER THEREBY WASHING OUT SAID SUBSTANTIALLY UNEXPOSED PORTION OF SAID LAYER AND UNCOVERING A PORTIN OF SAID FILM CORRESPONDING IN SHAPE TO SAID SECOND AREA, (I) DIRECTING A SANDBLAST STREAM TO THE UNIT SO FORMED THEREBY REMOVING THE UNCOVERED PORTION OF SAID FILM, AND THEREAFTER (J) WASHING SAID UNIT IN A SOLUTION OF APPROXIMATELY 30 PERCENT BY WEIGHT OF HYDROGEN PEROXIDE.

Claim 2

A METHOD OF MAKING AN ELECTRICAL RESISTIANCE DEVICE HAVING A PATTERNED FILM RESISTANCE ELEMENT ON A DIELECTRIC SUBSTRATE COMPRISING THE STEPS OF (A) PROVIDING A FLAT DIELECTRIC SUBSTRATE, (B) APPLYING A CONTINUOUS ADHERENT IRRIDIZED METALLIC OXIDE FILM DIRECTLY TO AT LEAST ONE SURFACE OF SAID SUBSTRATE, (C) APPLYING A LYER OF A MIXTURE OF POLYVINYL ALCOHOL AND POTASSIUM BICHROMATE TO SAID FILM, (D) DRYING SAID LAYER, (E) DISPOSING A MEMBER ADJACENT SAID LAYER, SAID MEMBER HAVING A LIGHT TRANSMITTING FIRST AREA CORRESPONDING IN SHAPE TO THE DESIRED RESISTANCE ELEMENT CONFIGURATION AND ARRANGEMENT AND A SUBSTANTIALLY OPAQUE SECOND AREA SURROUNDING SAID FIRST AREA, (F) ILLUMINATING THE ASSEMBLY SO FORMED WITH AN ULTRAVIOLET LIGHT FOR APPROXIMATELY 3 1/2 MINUTES, THEREBY EXPOSING AN AREA OF SAID LAYER CORRESPONDING IN SHAPE TO SAID FIRST AREA WHILE LEAVING THE REMAINDER OF SAID LAYER SUBSTANTIALLY UNEXPOSED, (G) REMOVING THE SAID MEMBER, (H) DIRECTING A WATER SPRAY TO SAID LAYER THEREBY WASHING OUT SAID SUBSTANTIALLY UNEXPOSED PORTION OF SAID LAYER AND UNCOVERING A PORTIN OF SAID FILM CORRESPONDING IN SHAPE TO SAID SECOND AREA, (I) DIRECTING A SANDBLAST STREAM TO THE UNIT SO FORMED THEREBY REMOVING THE UNCOVERED PORTION OF SAID FILM, AND THEREAFTER (J) WASHING SAID UNIT IN A SOLUTION OF APPROXIMATELY 30 PERCENT BY WEIGHT OF HYDROGEN PEROXIDE.