Parkhurst, Wendel & Rossi
Resistance adjusting type heater
 A resistance adjusting type heater has a honeycomb structure having a large number of passages, at least two electrodes to enable electrical heating of the honeycomb structure provided on the honeycomb structure, and a resistance adjusting means, a slit, provided between the electrodes. The thicknesses of passage walls at the portions of the honeycomb structure at which electricity flows at a very high density are increased with a conductive material to prevent the abnormal heat generation at the portions of the honeycomb structure. 
NGK Insulators, Ltd.
Y F F F H B F Y Y
Y10T F01N F01N F01N H05B B01J F01N Y02T Y10S
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Takashi Tomoharu Fumio Hiroshige
Harada Kondo Abe Mizuno