Patent ID: 9419415
Filing Date: 2016-08-16
CPC Classification: H01T

Claim Text:
1. A spark plug, comprising: an insulator that extends along a central axis, the insulator including a through hole that passes through the insulator along the central axis; a center electrode that extends along the central axis, the center electrode including a rear end positioned inside of the through hole; a metal terminal nut that extends along the central axis, the metal terminal nut including a tip end positioned at the rear end side with respect to the rear end of the center electrode inside of the through hole; a resistor disposed in a position between the center electrode and the metal terminal nut inside of the through hole and apart from the center electrode; and a conductive seal disposed between the resistor and the center electrode inside of the through hole, the conductive seal contacting both the center electrode and the resistor, wherein the resistor has a contact surface in contact with the conductive seal, the contact surface including: