Patents Assigned to Cercona, Inc.
  • Porous ceramic article for use as a filter for removing particulates from diesel exhaust gases
    Patent number: 4976760
    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.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: December 11, 1990
    Assignee: Cercona, Inc.
    Inventors: Richard L. Helferich, Robert C. Schenck