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:
Dec. 11, 1990
Filed:
Sep. 08, 1989
Applicant:
Inventors:
Richard L Helferich, Clayton, OH (US);
Robert C Schenck, Kettering, OH (US);
Assignee:
Cercona, Inc., Dayton, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55487 ; 55523 ; 55DI / ;
Abstract
A filtering element for use in trapping particulates from a diesel exhaust gas, made up of a porous refractory ceramic body of predominant open-cell porosity prepared by firing an aluminosilicate hydrogel-bonded porous ceramic composition, and preferably further containing on the filter inlet and/or outlet surface thereof an integral thin porous ceramic membrane layer having pores whose average diameter is less than that of the pores in the body and at the other surfaces.