Patent ID: 7947102

Claim:
A ceramic honeycomb filter comprising a porous ceramic honeycomb body having an inlet end and outlet end connected by adjacent inlet and outlet channels that extend from the inlet end to the outlet end of the ceramic body, the inlet and outlet channels being defined by a plurality of interlaced thin gas filtering porous partition walls between the inlet and outlet channels and by ceramic plugs, such that the inlet channel has an inlet ceramic plug at the outlet end of the ceramic body and the outlet channel has an outlet ceramic plug at the inlet end of the ceramic body such that a fluid when entering the inlet end must pass through partition walls to exit the outlet end, wherein the ceramic honeycomb body has at least one porous partition wall that is (1) microstructurally different along the length of the channel, (2) microstructurally different than at least a portion of a partition wall defining another channel or (3) combination thereof, wherein microstructurally different is when the average pore size, pore size distribution, grain morphology, grain size, total porosity or combination thereof of the wall is at least 10% different.