Gas separation – Specific media material – Ceramic or sintered
Reexamination Certificate
2008-02-20
2011-11-15
Greene, Jason M (Department: 1776)
Gas separation
Specific media material
Ceramic or sintered
C055S282300, C055S385300, C055S524000, C055SDIG007, C060S311000, C422S180000, C264S044000, C264S628000, C264S630000, C264SDIG048, C501S006000, C501S007000
Reexamination Certificate
active
08057568
ABSTRACT:
A highly porous substrate is provided using an extrusion system. More particularly, the present invention enables the production of a highly porous substrate. Depending on the particular mixture, the present invention enables substrate porosities of about 60% to about 90%, and enables advantages at other porosities, as well. The extrusion system enables the use of a wide variety of fibers and additives, and is adaptable to a wide variety of operating environments and applications. Fibers, which have an aspect ratio greater than 1, are selected according to substrate requirements, and are typically mixed with binders, pore-formers, extrusion aids, and fluid to form a homogeneous extrudable mass. The homogeneous mass is extruded into a green substrate. The more volatile material is preferentially removed from the green substrate, which allows the fibers to form interconnected networks. As the curing process continues, fiber to fiber bonds are formed to produce a structure having a substantially open pore network. The resulting porous substrate is useful in many applications, for example, as a substrate for a filter or catalyst host, or catalytic converter.
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“Wall-Flow Monoliths
Carty William M.
Dutta Biprodas
Lachenauer Robert G.
Pillai Sunilkumar C.
Zuberi Bilal
GEO2 Technologies, Inc.
Greene Jason M
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