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:
Jul. 14, 2009
Filed:
Aug. 23, 2004
Seiji Okawara, Toyota, JP;
Seiji Okawara, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An exhaust gas-purifying apparatus includes an NOsorbing-and-reducing first catalyst, a filter second catalyst, and an NOsorbing-and-reducing third catalyst, which are disposed in an exhaust system in this order from a downstream side to an upstream side of a flow of exhaust gases. In the exhaust system, a liquid reducing agent is supplied into the exhaust gases intermittently. The first catalyst exhibits a remarkably high NOpurifying ability, because not only the third catalyst and the second catalyst gasify, crack and homogenize the reducing gas fully but also the reactions at the third and second catalysts elevate the temperature of exhaust gases. Thus, the exhaust gas-purifying apparatus can purify PMs and NOefficiently.