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:
Aug. 06, 2013
Filed:
Oct. 14, 2008
Shunji Okazaki, Miyako-gun, JP;
Toshitaka Ishizawa, Miyako-gu, JP;
Shunji Okazaki, Miyako-gun, JP;
Toshitaka Ishizawa, Miyako-gu, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A cordierite-based ceramic honeycomb filter comprising a honeycomb structure having a large number of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet side or the exhaust-gas-outlet side for permitting an exhaust gas to pass through said porous cell walls to remove particulate matter from the exhaust gas, said porous cell walls having porosity of 45-58%, an average pore size of 15-30 μm, the volume of pores having pore sizes exceeding 50 μm being more than 10% and 25% or less of the total pore volume, the volume of pores having pore sizes of 100 μm or more being 1-8% of the total pore volume, the volume of pores having pore sizes of less than 10 μm being 3-10% of the total pore volume, and said pores having a pore size distribution deviation σ [=log(D20)−log(D80)] of 0.6 or less, wherein D20 represents a pore size (μm) at a pore volume corresponding to 20% of the total pore volume, and D80 represents a pore size (μm) at a pore volume corresponding to 80% of the total pore volume, both in a curve representing the relation between the pore size and the cumulative pore volume, and D80<D20.