Feed-through capacitor

Claim 1

IN A FREE-THROUGH FILTER FOR USE AT HIGH FREQUENCIES AND COMPRISING A DIELECTRIC TUBE HAVING METALLIC ELECTRODES DISPOSED ON ONE OF THE CYLINDRICAL SURFACES THEREOF AND IN CAPACITIVE RELATIONSHIP WITH A PLURALITY OF SEPARATELY SPACED METALLIC ELECTRODES ON THE OPPOSING CYLINDRICAL SURFACE, SAID ELECTRODES BEING SPACED APART TO LEAVE A BAND ON THE TUBE EXPOSED, AND A FERRITE BODY DISPOSED AXIALLY ALONG A PORTION OF THE TUBE AND IN INDUCTIVE RELATIONSHIP WITH THE SURFACE BETWEEN SAID SPACED ELECTRODES: THE COMBINATION THEREWITH OF AN ELECTRICALLY RESISTIVE COATING COMPRISING A VEHICLE HAVING DISPERSED THEREIN PARTICLES OF CONDUCTIVE MATERIAL APPLIED TO THE EXPOSED SURFACE BETWEEN SAID SPACED ELECTRODES TO PROVIDE A CONDUCTIVE BRIDGE BETWEEN THE SPACED ELECTRODES, SAID BRIDGE HAVING AN OHMIC VALUE SUBSTANTIALLY GREATER THAN THE HIGH FREQUENCY RESISTANCE OF THE FERRITE BODY; WHEREBY THE DENSITY OF THE ELECTRICAL FIELD EXISTING WITHIN THE DIELECTRIC TUBE PROXIMATE TO THE AREA COVERED BY SAID BRIDGE WILL BE DECREASED, THUS IN TURN DECREASING THE VOLTAGE STRESSES WITHIN SAID AREA OF THE DIELECTRIC, AND THEREBY IMPROVE THE ULTIMATE BREAKDOWN AND DISCHARGE VOLTAGES OF SAID FEED-THROUGH FILTER.