Exhaust gas purifying filter
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United States of America Patent
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Nov 20, 2007
Grant Date -
Jun 9, 2005
app pub date -
Feb 13, 2003
filing date -
Mar 13, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
There is disclosed an exhaust gas purifying filter of the present invention comprising a honeycomb structure formed of a porous ceramic material and including: a large number of through-holes 3; plugged portions 10 formed in one end portion of each of predetermined through-holes 3 and in the other end portion of each of remaining through-holes 3; and partition walls 2 partitioning the through-holes 3 and formed into filter layers, characterized in that a plugging length is non-uniform for each plugged portion 10, and the filter has characteristics such as high porosity and thin wall while hardly causing defects such as chipping and falling-off of the plugged portions during packing, transporting, and handling.
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