The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 2011
Filed:
Feb. 20, 2008
Bilal Zuberi, Cambridge, MA (US);
Sunilkumar C. Pillai, North Billerica, MA (US);
Biprodas Dutta, Silver Spring, MD (US);
William M. Carty, Alfred Station, NY (US);
Robert G. Lachenauer, Weston, MA (US);
Bilal Zuberi, Cambridge, MA (US);
Sunilkumar C. Pillai, North Billerica, MA (US);
Biprodas Dutta, Silver Spring, MD (US);
William M. Carty, Alfred Station, NY (US);
Robert G. Lachenauer, Weston, MA (US);
GEO2 Technologies, Inc., Woburn, MA (US);
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.