Patent ID: 9394816
Filing Date: 2016-07-19
CPC Classification: B01D,F01N

Claim Text:
1. A particulate filter, comprising: a plurality of first passages, the ends of the first passages being blocked on an upstream-side in a flow direction of exhaust gas; a plurality of second passages, the ends of the second passages being blocked on a downstream side in the flow direction of exhaust gas; porous partition walls that are members that separate the first passages from the second passages, the porous partition walls having pores of a size such that ash passes through the pores; and a porous coat layer provided at part of a region of the partition walls from an upstream end of the partition walls up to a position before a downstream end of the partition walls, the porous coat layer having pores smaller than the pores of the partition walls, and a thickness of the porous coat layer decreasing gradually from the end of the upstream side of the porous coat layer towards the downstream side of the porous coat layer.