Patent ID: 7204965

Claim:
A filter catalyst for purifying exhaust gases emitted from internal combustion engines and including particulates, the filter catalyst comprising: a wall-flow honeycomb structure including: inlet cells clogged on the downstream side of the exhaust gases; outlet cells neighboring the inlet cells, and clogged on the upstream side of the exhaust gases; filter cellular walls demarcating the inlet cells and the outlet cells, and having pores; and a catalytic layer formed on at least one surface selected from the group consisting of the surface of the filter cellular walls and the surface of the pores of the filter cellular walls; and an upstream-side straight honeycomb structure disposed on the upstream side of the exhaust gases with respect to the wall-flow honeycomb structure, provided integrally with the wall-flow honeycomb structure, and including: upstream-side straight cells in which the exhaust gases flow straight and which face the end surface of the filter cellular walls; and upstream-side cellular walls demarcating the upstream-side straight cells; and ramps extending from the upstream-side cellular walls in a tapered manner, connecting the upstream-side cellular walls with the filter cellular walls and leading the exhaust gases to the inlet cells.