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:
Oct. 23, 2012
Filed:
Nov. 09, 2011
Takashi Mizutani, Tokoname, JP;
Koji Nagata, Nagoya, JP;
Yukio Miyairi, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A honeycomb filter includes a partition portion having a thickness tof 150 μm or more and 460 μm or less and a trapping layer having an average thickness tof 5 μm or more and 80 μm or less, wherein a film thickness ratio Yof a downstream thickness tto an up- and mid-stream thickness tsatisfies a relationship according to formula (1), wherein a film thickness ratio Yof the maximum thickness tof a trapping layer to the average thickness tof the trapping layer satisfies a relationship according to formula (2), and wherein a cell has a hydraulic diameter HDsatisfying a relationship according to formula (3):−4/375·+2.05≦≦−17/375·+10.23  (1);≦−1/15·+8.33  (2); and0.95≦≦2.0  (3).