US Patent 9707516 Honeycomb filter

A honeycomb filter includes a plurality of cells and porous cell walls. Exhaust gas is to flow through the plurality of cells. The plurality of cells include exhaust gas introduction cells and exhaust gas emission cells. The honeycomb filter has a round cross sectional shape. The honeycomb filter has a ratio of length of the honeycomb filter to a diameter of the round cross sectional shape of less than 1.0. A total volume of the exhaust gas introduction cells is larger than a total volume of the exhaust gas emission cells.