Patent ID: 7059926

Claim:
A method of manufacturing a center wire assembly for use in a spark plug, comprising the steps of: (a) inserting a firing electrode into a longitudinal bore of an insulator; (b) inserting a conductive glass powder into the longitudinal bore above the firing electrode; (c) inserting an intermediate electrode into the longitudinal bore such that the conductive glass powder is located between the firing and intermediate electrodes in contact with both said electrodes; (d) fusing the conductive glass powder together to thereby form a conductive seal between the firing and intermediate electrodes; (e) inserting a resistive glass powder into the longitudinal bore above the intermediate electrode; (f) inserting a terminal electrode into the longitudinal bore such that the resistive glass powder is located between the intermediate and terminal electrodes; and (g) fusing the resistive glass powder together to thereby form a noise suppressing seal between the intermediate and terminal electrodes.