An exhaust gas cleaning device for collecting carbon particulates in the exhaust gases, is disclosed. The device is provided with a filter member formed of a material having interconnected pores and an electric heater which is buried within the exhaust gas inlet end portion of the filter member. According...http://www.google.com/patents/US4456457?utm_source=gb-gplus-sharePatent US4456457 - Exhaust gas cleaning device for diesel engine
