Gas separation – Specific media material – Ceramic or sintered
Reexamination Certificate
2007-06-11
2010-12-28
Lawrence, Frank M (Department: 1797)
Gas separation
Specific media material
Ceramic or sintered
C055S529000
Reexamination Certificate
active
07857885
ABSTRACT:
A column shaped filter having a honeycomb structure including a number of through holes extending parallel with one another in the length direction with wall portion interposed therebetween. The through holes are constituted by large-capacity through holes having a relatively larger cross-sectional area in the cross section perpendicular to the length direction and small-capacity through holes having a relatively smaller cross-sectional area in the cross section. The numbers of the two types of through holes are substantially set to the same. The large-capacity through holes are sealed at one end of the filter, while the small-capacity through holes are sealed at the other end of the filter. The large-capacity and small-capacity through holes have a ratio of partition wall length, α, and an aperture ratio, β, and α and β satisfy β≧(20/9)α2+1 (where 0<α≦1.5 and 1<β≦6).
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Hong Sung-tae
Komori Teruo
Ohno Kazushige
Ibiden Co. Ltd.
Lawrence Frank M
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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