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:
Nov. 09, 2004
Filed:
Aug. 01, 2002
Applicant:
Inventors:
Mikio Ishihara, Kariya, JP;
Mamoru Nishimura, Nagoya, JP;
Assignee:
Denso Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 4/600 ; B01D 3/920 ;
U.S. Cl.
CPC ...
B01D 4/600 ; B01D 3/920 ;
Abstract
An exhaust purification filter having high filter efficiency and low pressure loss. The exhaust purification filter purifies exhaust gas by trapping particulate matter contained in exhaust gas discharged from an internal combustion engine. The exhaust gas purification filter has a honeycomb structure composed of partitions having a large number of pores, and cells separated by the partitions. The surface opening area of the partitions attributable to pores having a surface opening diameter of 10 &mgr;m or less is 20% or less of the total surface opening area ratio.