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:
Mar. 24, 2009
Filed:
Sep. 13, 2004
Yasuaki Nakano, Sunto-gun, JP;
Shinya Hirota, Susono, JP;
Yasuaki Nakano, Sunto-gun, JP;
Shinya Hirota, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an exhaust gas purifying system including two NOx catalysts disposed in series with each other on an exhaust passage, oxides occluded in the NOx catalysts can be reduced appropriately. When the oxides occluded in an upstream or downstream NOx catalyst are reduced, the surrounding atmosphere of each NOx catalyst is changed between a reducing atmosphere and an oxidative atmosphere. The air-fuel ratio of exhaust gas upstream of the upstream NOx catalyst is made lower when the surrounding atmosphere of the downstream NOx catalyst is changed into a reducing atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into a reducing atmosphere, and the duration of the oxidative atmosphere is made longer when the surrounding atmosphere of the downstream NOx catalyst is changed into an oxidative atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into an oxidative atmosphere.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile