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:
Jan. 06, 2004
Filed:
Mar. 30, 2001
Applicant:
Inventors:
Yasuki Tamura, Aichi, JP;
Kazuhito Kawashima, Aichi, JP;
Takuya Okamoto, Aichi, JP;
Osamu Nakayama, Aichi, JP;
Assignee:
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 ;
U.S. Cl.
CPC ...
F01N 3/00 ;
Abstract
When exhaust gases flowing into catalysts (e.g., a NOx catalyst and a three-way catalyst) continue to be in the fuel-rich atmosphere for a predetermined period of time or longer, an exhaust emission purifying device for an internal combustion engine leans an air-fuel mixture or supplies the secondary air to the exhaust gases in order to turn the exhaust gases flowing into catalysts into an oxygen-rich atmosphere. This enables the proper regeneration of the degraded catalysts, and thus improves an exhaust emission control performance.