Patent attributes
A particulate filter (22) for collecting particulates in the exhaust gas is comprised. The particulate filter (22) includes partitioning walls (54) for forming passages (50, 51). The partitioning walls (54) are made of a porous material. The end portions of adjacent partitioning walls (54) are brought close each other so as to narrow the respective passage formed by the partitioning walls (54), and the cross-sectional area of the flow path at the end region of the passage is made to be smaller than the cross-sectional area of the flow path in the remaining regions of the passage. The particulate filter (22) has an extended portion (55) which extends beyond the top ends of the partitioning walls (54) from the end surface of the particulate filter (22).
