Ceramic honeycomb filter for purifying exhaust gases
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United States of America Patent
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-
Aug 15, 1989
Grant Date -
N/A
app pub date -
Jan 25, 1988
filing date -
Jan 28, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ceramic honeycomb filter for purifying exhaust gases from combustion engines includes a ceramic honeycomb structure formed by extruding and having a number of through-passages alternately closed at their ends by ceramic closure members. The through-passages formed by partition walls for capturing fine particles in the exhaust gases accumulated on the partition walls. The ceramic honeycomb filter comprises porous ceramic layers provided on the partition walls over a distance of 1/10-8/10 of an effective length of the filter from outlet ends of said through-passages for the exhaust gases.
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