Particulate filter

Abstract

A particulate filter for internal combustion engines includes a housing defining an inlet side and an outlet side and a core body disposed in the housing and having a plurality of longitudinal channels which extend parallel to a longitudinal axis of the core. The longitudinal channels include inlet channels that are closed off in the proximity of the outlet side and outlet channels that are closed off in the proximity of the inlet side. Each of the longitudinal channels has a circumferential cross section. The periphery of the circumferential cross section for at least the inlet channels has a concaved closed figure structure.

1 - 12 . (canceled) 
     
     
         13 . A particulate filter for internal combustion engines comprising a core body having a plurality of longitudinal channels formed therein which extend parallel to a longitudinal axis of the particulate filter, wherein each of the longitudinal channels has a constant cross sectional configuration with a circumference having a closed concaved shape. 
     
     
         14 . The particulate filter according to  claim 13 , wherein the constant cross sectional configuration comprises at least one ridge on an inner surface thereof. 
     
     
         15 . The particulate filter according to  claim 14 , wherein the constant cross sectional configuration comprises a concave polygon. 
     
     
         16 . The particulate filter according to  claim 15 , wherein the concave polygon comprises an equiangular polygon. 
     
     
         17 . The particulate filter according to  claim 15 , wherein the concave polygon comprises an equilateral polygon. 
     
     
         18 . The particulate filter according to  claim 15 , wherein the concave polygon comprises a stellate polygon. 
     
     
         19 . The particulate filter according to  claim 15 , wherein the concave polygon comprises a regular polygon. 
     
     
         20 . The particulate filter according to  claim 15 , wherein the concave polygon comprises at least ten sides. 
     
     
         21 . The particulate filter according to  claim 13 , wherein the circumferential cross sections of all longitudinal channels are the same shape. 
     
     
         22 . The particulate filter according to  claim 13 , wherein a cross sectional area for each of the longitudinal channels is equal. 
     
     
         23 . The particulate filter according to  claim 13 , wherein a hydraulic diameter for each of the longitudinal channels is equal. 
     
     
         24 . The particulate filter according to  claim 13 , wherein the core body comprises a porous ceramic material. 
     
     
         25 . The particulate filter according to  claim 24 , wherein the porous ceramic material is cordierite. 
     
     
         26 . A particulate filter assembly for internal combustion engines comprising:
 a housing having an inlet in fluid communication with an interior volume and an outlet in fluid communication with the interior volume; and   a core body having an inlet face adjacent the housing inlet, an outlet face adjacent the housing outlet, a plurality of inlet channels extending parallel to a longitudinal axis of the core body that are closed off at the outlet face and a plurality of outlet channels extending parallel to the longitudinal axis of the core body that are closed off at the inlet face, wherein each of the inlet channels has a constant cross sectional configuration with a circumference consisting of a closed concaved shape defining at least one ridge on an inner surface thereof.   
     
     
         27 . The particulate filter assembly according to  claim 26 , wherein each of the outlet channels has a constant cross sectional configuration with a circumference consisting of a closed concaved shape. 
     
     
         28 . The particulate filter assembly according to  claim 27 , wherein the inlet channels and the outlet channels have the same constant cross sectional configuration. 
     
     
         29 . The particulate filter assembly according to  claim 26 , wherein a cross sectional area for each of the longitudinal channels is equal. 
     
     
         30 . The particulate filter assembly according to  claim 26 , wherein a hydraulic diameter for each of the longitudinal channels is equal. 
     
     
         31 . The particulate filter assembly according to  claim 26 , wherein the core body comprises a porous ceramic material. 
     
     
         32 . The particulate filter assembly according to  claim 31 , wherein the porous ceramic material is cordierite.