In an exhaust gas purification device, an exhaust gas passage of a diesel engine diverges into two branch pipes and a particulate filter (DPF) is disposed in each of the branch pipes. The DPF uses a metallic substrate and NO.sub.x absorbent is attached to the wall of the paths in the DPF. Therefore,...http://www.google.com.au/patents/US5974791?utm_source=gb-gplus-sharePatent US5974791 - Exhaust gas purification device for an internal combustion engine
