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:
Oct. 26, 1999
Filed:
Oct. 03, 1997
Ryouta Doi, Naka-machi, JP;
Hidehiro Iizuka, Hitachinaka, JP;
Hiroshi Hanaoka, Kodaira, JP;
Toshio Ogawa, Takahagi, JP;
Osamu Kuroda, Hitachi, JP;
Hisao Yamashita, Hitachi, JP;
Yuichi Kitahara, Hitachinaka, JP;
Toshifumi Hiratsuka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to remove nitrogen oxide in an exhaust gas released from a lean burn engine, a catalyst: supporting an rare earth metal, an alkali earth metal, titanium, a noble metal, and magnesium on the surface of a porous carrier made of inorganic oxides is provided. In order to manufacture the catalyst, the rare earth metal is supported onto the surface of the carrier first, subsequently the alkali earth metal other than magnesium and titanium are supported, the noble metal is supported, and magnesium is supported finally onto the surface of the carrier. The catalyst of the present invention is scarcely poisoned by SOx in the exhaust gas released from the lean burn engine, and has a heat resistivity durable against high speed driving.