Cushman, Darby & Cushman
Exhaust gas purification apparatus for internal combustion engine
 An exhaust gas purification apparatus has a catalyst unit provided in an exhaust pipe of an engine and an absorbent provided downstream of the catalyst unit. When the engine is in a cool state, HC emitted from the engine is absorbed by the absorbent. After the engine is warmed up, the absorbed HC is desorbed by heat of an exhaust gas and returned to an upstream side of the catalyst unit the HC by heat of an exhaust gas. 
Nippondenso Co., Ltd.
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Masakazu Mamoru Makoto Hiroshi
Tanaka Mabuchi Saito Mori