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:
Dec. 11, 2007
Filed:
Sep. 12, 2003
Seiji Okawara, Toyota, JP;
Seiji Okawara, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Abstract
A filter catalyst for purifying exhaust gases having a catalytic layer comprising the first catalyst supporthaving an average particle diameter of 1 μm or less, the second catalyst supporthaving an average particle diameter from 1/20 to ½ of the average pore diameter of the filter cellular wallsand catalytic ingredients, on the filter cellular wallshaving an average pore diameter of from 20 to 40 μm, and the catalytic layer having uneven surfaces is used. Since the second catalyst support hardly enters into the pore with a diameter of 20 μm or less, it exists partly on the filter cellular walls and the inside surface of the wall. Therefore, since particles collide with the convex part of the catalytic layer, it becomes possible to collect them easily and the collecting rate for particles and the ability of the particles purification are improved.