Variable resistance potentiometer of the type having a conductive plastic track on an electrically insulating base

Claim 1

A POTENTIOMETER OF THE CLASS DESCRIBED INTEGRALLY COMOLDED AND COMPRISING A NON-FLEXIBLE ELECTRICALLY INSULATING PLASTIC BASE HAVING AN UNINTERRUPTED PLANAR SURFACE, A WAFER THIN SPRAY COATING OF PARTICLES DEPOSITED ON SAID SURFACE OF THE BASE FORMING A VARIABLE RESISTANCE CONDUCTIVE PLASTIC TRACK VARYING IN ITS DEPTH DIMENSION IN PROPORTION TO THE RESISTANCE CHARACTERISTIC AT GIVEN POINTS ON SAID TRACK, SAID TRACK BEING FLUSH WITH SAID SURFACE OF THE BASE AND THE PARTICLES OF SAID COATING BEING PRESSED INTO COMINGLING ASSOCIATION WITH RESPECT TO THE SURFACE PARTICLES OF SAID SURFACE OF THE BASE FOR RECEIVING A MOVABLE WIPER THEREON, AND CONDUCTIVE PLASTIC TERMINALS IN ELECTRICAL CONNECTION WITH THE UNDERSIDE OF SAID TRACK AND FLUSH WITH SAID SURFACE OF THE BASE OUTSIDE OF THE TRACK WIDTH.