Process for the production of electrical resistors and resulting article

Claim 1

A PROCESS FOR THE PRODUCTION OF AN ELECTRICAL RESISTOR COMPRISING A BODY COMPOSED AOF A VITRIFIED OR SINTERED INORGANIC MATERIAL AND AN ELECTRICALLY CONDUCTIVE FIRED ON LAYER CONSISTING OF OXIDES, WHICH INCLUDES APPLYING A SUSPENSION OF A FLUX AND A POWDERED OXIDE MIXTURE IN A LIQUID TO SAID RESISTOR BODY TO FORM A COATING THEREON WHEREIN THE POWDERED OXIDE MIXTURE IS PREPARED SEPARATELY AND IS MIXED WITH THE FLUX SUSPENSION TO FORM A SLIP, SAID POWDERED OXIDE MIXTURE COMPRISING TIN OXIDE AND AT LEAST ONE OF THE OXIDES SELECTED FROM THE GROUP CONSISTING OF BORON OXIDE AND ANTIMONY OXIDE, AND SAID LIQUID BEING INERT TO THE FLUX AND TO THE POWDERED OXIDE MIXTURE, THEN DRYING THE RESULTANT COATED BODY AND THEREAFTER FIRING IT UNDER NON-REDUCING CONDITIONS TO PRODUCE A RESISTIVE FILM ON SAID RESISTOR BODY WHICH RESISTIVE FILM IS IN THE FORM OF A FIRED ON LAYER, THE PROPORTIONS AND AMOUNTS OF SAID POWDERED OXIDE AND FLUX AND THE THICKNESS OF THE COATING APPLIED TO SAID RESISTOR BODY BEFORE FIRING BEING SUCH AS TO PRODUCE A FILM AFTER FIRING HAVING A SURFACE RESISTIVITY GREATER THAN 1,000 OHMS PER SQUARE.