Patent attributes
This particulate filter 200 has a columnar ceramic honeycomb structure 201 including first flow channels 210 and second flow channels 220. Adjacently to each of the first flow channels 210, the second flow channel 220 and the other first flow channel 210 are arranged through a partition wall portion forming each of the first flow channels 210. A sum total of areas of the inner faces of the first flow channels 210 per apparent unit volume of the ceramic honeycomb structure 201 is 1.5 to 2.5 m2/L; a number density of a total of the first flow channels 210 and the second flow channels 220 is 150 to 350 per unit square inch in a cross section perpendicular to an axis of the ceramic honeycomb structure 201; and a hydraulic diameter of each of the first flow channels 210 is 0.5 to 1.0 mm.
