Patent ID: 8057766

Claim:
An exhaust gas purifying apparatus comprising: a metal casing comprising a gas inlet side and a gas outlet side; and a honeycomb filter installed in said metal casing and comprising cell walls, a first end face, and a second end face, the cell walls extending along a longitudinal direction of the honeycomb filter to define a plurality of cells between the cell walls, said plurality of cells comprising: a first cell and a second cell provided alternately; said first cell comprising an open end on a side of said first end face and a sealed end on a side of said second end face; said second cell comprising an open end on a side of said second end face and a sealed end on a side of said first end face; and a cross-sectional area of said first cell perpendicular to said longitudinal direction being smaller than a cross-sectional area of said second cell perpendicular to said longitudinal direction throughout the entire length of said honeycomb filter, said first end face of the honeycomb filter being disposed on said gas inlet side of said metal casing, and said second end face of the honeycomb filter being disposed on said gas outlet side of said metal casing.