The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2006
Filed:
Apr. 10, 2002
Hiroshi Hanaoka, Kodaira, JP;
Osamu Kuroda, Hitachi, JP;
Ryouta Doi, Naka-gun, JP;
Hidehiro Iizuka, Hitachinaka, JP;
Toshio Ogawa, Takahagi, JP;
Hisao Yamashita, Hitachi, JP;
Shigeru Azuhata, Hitachi, JP;
Yuichi Kitahara, Hitachinaka, JP;
Toshifumi Hiratsuka, Hitachinaka, JP;
Kojiro Okude, Hitachi, JP;
Norihiro Shinotsuka, Hitachinaka, JP;
Toshio Manaka, Hitachinaka, JP;
Hiroshi Hanaoka, Kodaira, JP;
Osamu Kuroda, Hitachi, JP;
Ryouta Doi, Naka-gun, JP;
Hidehiro Iizuka, Hitachinaka, JP;
Toshio Ogawa, Takahagi, JP;
Hisao Yamashita, Hitachi, JP;
Shigeru Azuhata, Hitachi, JP;
Yuichi Kitahara, Hitachinaka, JP;
Toshifumi Hiratsuka, Hitachinaka, JP;
Kojiro Okude, Hitachi, JP;
Norihiro Shinotsuka, Hitachinaka, JP;
Toshio Manaka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which the exhaust gas containing NOx gas passes and a catalyst so disposed in the exhaust gas duct that it contacts with the exhaust gas. The catalyst chemically adsorbs NOx under the condition that a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NOx, while NOx being adsorbed is catalytically reduced in the presence of the reducing agent under the condition that the stoichiometric amount of the oxidizing agent is not larger that of the reducing agent. Thereby, NOx, the lean burn exhaust gas in the engine can be effectively made harmlessly.