Exhaust gas purifying filter and production of the same
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United States of America Patent
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-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Nov 21, 1985
filing date -
Nov 24, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust gas purifying filter having a multiplicity of inward being open at the one axial end and blocked at the other axial end, a multiplicity of outward passages parallel to the axis of the filter, the outward passages being open at one axial end and blocked at the other axial end, and having porous partition walls placed between the inward passages and the outward passages and separating the inward passages and the outward passages from one another, which is characterized in that the surface of the partition wall exposed to at least the inward passage has superficial pores communicating with internal pores in the partition wall, the superficial pores being composed of small pores having a diameter of 5 to 40 .mu.m and large pores having a diameter of 40 to 100 .mu.m, the number of the small pores being 5 to 40 times that of said large pores and production of the same.
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