Patent ID: 9371761
Filing Date: 2016-06-21
CPC Classification: B01J,F01N,H05B,Y02T

Claim Text:
1. An electric heating catalyst comprising: a heater element that is formed into a cylindrical shape, and is electrically energized to generate heat so that a catalyst is heated by the generation of heat; and a pair of electrodes that supply electricity to said heater element, and are connected to an outer circumferential surface of said heater element so as to sandwich said heater element therebetween; wherein said pair of electrodes have surface electrodes formed in such a manner that they extend spirally from one end of said heater element toward the other end thereof along the outer circumferential surface of said heater element, and mutually cross each other while sandwiching said heater element therebetween, and a shortest distance between the surface electrodes on the outer periphery of the heater element is equal to or more than a central angle of 90 degrees, and a width of each surface electrode is equal to or larger than a central angle of 60 degrees; and the width in each of said surface electrodes in the vicinity of their ends which are in contact with circumferences of end faces of said heater element is enlarged in a range in which the shortest distance on the outer periphery of said heater element between the surface electrodes in the vicinity of said ends becomes equal to or more than a central angle of 90 degrees.