Gas separation – Specific media material – Ceramic or sintered
Reexamination Certificate
2005-02-24
2008-07-01
Greene, Jason M. (Department: 1797)
Gas separation
Specific media material
Ceramic or sintered
C055S282200, C055S282300, C055S385300, C055S523000, C055S524000, C055SDIG010, C055SDIG030, C060S311000, C428S116000
Reexamination Certificate
active
07393377
ABSTRACT:
In a honeycomb filter in which a plurality of cells are formed by porous partition walls, and a predetermined cell whose one end portion is plugged, and a remaining cell whose other end portion is plugged are alternately arranged in such a manner as to form checked patterns in the opposite end portions. In a section of the filter, a sectional area of the predetermined cell is different from that of the remaining cell, a value of a ratio of a channel hydraulic diameter of the cell having a large sectional area to that of the cell having a small sectional area is 1.2 or more, at least a sectional shape of the cell having the large sectional area is a quadrangular shape whose portion corresponding to at least one corner portion is circular, and a value of a ratio of minimum thickness of a portion (intersection portion) in which the partition walls cross one another to a thickness of each partition wall2is 0.7 or more and less than 1.3. The honeycomb filter is capable of inhibiting a fluid inflow-side end face (opening of an inflow-side cell) from being closed by particulates and the like, and maintaining high strength.
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Kasai Yoshiyuki
Kuki Tatsuyuki
Greene Jason M.
NGK Insulators Ltd.
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