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:
Apr. 04, 2000
Filed:
Apr. 29, 1996
Hidehiro Iizuka, Tsuchiura, JP;
Osamu Kuroda, Hitachi, JP;
Toshio Ogawa, Takahagi, JP;
Hisao Yamashita, Hitachi, JP;
Shigeru Azuhata, Hitachi, JP;
Yuichi Kitahara, Hitachinaka, JP;
Takeshi Atago, Hitachinaka, JP;
Hiroatsu Tokuda, Hitachinaka, JP;
Takao Ishikawa, Hitachi, JP;
Hiroshi Hanaoka, Hitachi, JP;
Hiroshi Tobita, Kitaibaraki, JP;
Shinichi Ichikawa, Mito, JP;
Toshifumi Hiratsuka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An exhaust gas purifying catalyst is provided for purifying NOx contained in an exhaust gas from an internal combustion engine of a vehicle operated at a high air fuel ratio due to excessive oxygen, using unburnt HC or CO in the exhaust gas as a reducing agent. The catalyst comprises platinum, strontium and a rare earth metal, as active components, each supported on a support of inorganic oxide. The active components of the catalyst include platinum of 0.01-3.7 by wt ratio, strontium of 0.01-55 by wt ratio and a rare earth metal of 0.01-36 wt ratio, per the inorganic oxide of 100 by wt ratio.