Patent ID: 8043658

Claim:
A process comprising: first, dipping a first face of a diesel particulate filter into a first solution to a predetermined first depth, wherein the first solution comprises a first electrically conductive material; drying the first face of the diesel particulate filter to form a bottom electrode layer; second, after said drying the first face of the diesel particulate filter to form a bottom electrode layer, dipping the first face of the diesel particulate filter into a second solution to a predetermined second depth, wherein the second solution comprises an electrically resistive material; drying the first face of the diesel particulate filter to form a middle resistive layer overlying the bottom electrode layer; third, after drying the first face of the diesel particulate filter to form a middle resistive layer overlying the bottom electrode layer, dipping the first face of the diesel particulate filter into a third solution to a predetermined third depth, wherein the third solution comprises a second electrically conductive material; and drying the first face of the diesel particulate filter to form a top electrode layer overlying the bottom electrode layer and the middle resistive layer.