Patent ID: 8474249

Claim:
A diesel particulate filter configured to separate a particulate from an engine exhaust, the diesel particulate filter comprising: a downstream filtration stage including a plurality of downstream channels; an upstream filtration stage disposed upstream of and in fluidic communication with the downstream filtration stage, and including a plurality of upstream channels; and a shell at least partly enclosing the downstream filtration stage and the upstream filtration stage, the shell including an inlet configured to conduct the engine exhaust to the upstream filtration stage and an outlet configured to release the engine exhaust from the downstream filtration stage, one or more of the downstream and upstream channels including an oxidation catalyst wash coat, wherein the plurality of upstream channels includes a plurality of open upstream channels, and where the open upstream channels include the oxidation catalyst wash coat, and wherein the open upstream channels are arranged inhomogeneously among the upstream channels, an inhomogeneous arrangement of open upstream channels and upstream channels configured to disperse the particulate evenly over the plurality of downstream channels.