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. 31, 2010
Filed:
Aug. 30, 2004
Tsunehiro Kawata, Saitama-ken, JP;
Osamu Tokudome, Tochigi-ken, JP;
Hirohisa Suwabe, Tochigi-ken, JP;
Kenichiro Sekiguchi, Tochigi-ken, JP;
Hideya Yamane, Tochigi-ken, JP;
Tsunehiro Kawata, Saitama-ken, JP;
Osamu Tokudome, Tochigi-ken, JP;
Hirohisa Suwabe, Tochigi-ken, JP;
Kenichiro Sekiguchi, Tochigi-ken, JP;
Hideya Yamane, Tochigi-ken, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
In a ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, the cell walls have a porosity of 55-75%, with an average pore diameter Da of 10-30 μm and a pore area ratio Sa of 10-30% on their surfaces, and the average length La of the pores at their openings and the average width Lb of the pores at depth La from the surfaces of the cell walls meet the condition of 1.1<Lb/La<5 in an arbitrary vertical cut surface of the cell walls. In the cordierite-based ceramic honeycomb structure, the ceramic contains Fe and a spinel, the amount of the spinel being 4% or less by an X-ray diffraction intensity ratio, and most of the spinel having particle sizes in a range of 0.01-5 μm.