Honeycomb filter for exhaust gas decontamination and exhaust...

Details Honeycomb filter for exhaust gas decontamination and exhaust... Honeycomb filter for exhaust gas decontamination and exhaust...

2003-03-04

2008-09-23

Griffin, Walter D. (Department: 1797)

Gas separation

Specific media material

Ceramic or sintered

C055S522000, C095S273000, C422S180000

Reexamination Certificate

active

07427308

ABSTRACT:
A honeycomb filter for purifying exhaust gases that can almost completely burn and remove particulates accumulated on a wall portion by a regenerating process allowing residual ashes on the wall portion to easily move inside a through hole because the ashes are easily separated from the wall portion. In the honeycomb filter a columnar body made of porous ceramics, having parallel through holes in the length direction with a wall portion interposed therebetween, is designed so that part or all of the wall portion that separates the through holes from each other functions as a filter collecting particulates, wherein a length 1 of the longest side in a cross section perpendicular to the length direction of the through hole and a length L in the length direction of the columnar body satisfy: 60≦L/1≦500 and a surface roughness Ra (according to JIS B 0601) of the through hole inner wall satisfies: Ra≦100 μm

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