Patent ID: 9422852
Filing Date: 2016-08-23
CPC Classification: B01J,F01N,Y02T

Claim Text:
1. An electric heating catalyst comprising: a heater element which has a cylindrical shape and generates heat by supply of the electrical current, thereby heading a catalyst; a pair of electrodes by which electric power is supplied to said heater element and which include surface electrodes extending in axial and circumferential directions of said heater element along an outer circumferential surface of said heater element, said surface electrodes being arranged to be opposed to each other on said heater element located therebetween, wherein the width along the circumferential direction of said heater element of at least one of said surface electrodes varies along the axial direction of said heater element such that current flowing between said surface electrodes flows mainly on the outer circumferential surface of said heater element in a art of said heater element with respect to the axial direction and flows mainly in an inner portion of said heater element in another part of said heater element with respect to the axial direction.