US 5,855,781 A · Monolithic ceramic filter

Abstract

A monolithic ceramic filter having a portion of the partition wall of a honeycomb structure exposed with its end face on an outer wall surface of the structure and increased in thickness as compared to the remaining portion of the partition wall to form a flow resistance relaxing portion is disclosed. The monolithic ceramic filter may also have a groove-shaped recess which is separated via a partition from a liquid supply passage of a honeycomb structure and is in communication with the outside of the structure. The flow resistance of the filtrate within the partition walls may be diminished to enable efficient filtration. The filter is produced simply by extrusion molding. There is no necessity of forming holes for discharging the filtrate in some cases.

Claims11

Dependent claims

An extruded monolithic ceramic filter having an axial length, said monolithic ceramic filter comprising:

(a) an outer peripheral wall (i) extending along said axial length and (ii) enclosing said monolithic ceramic filter, and
(b) a monolithic honeycomb structure within said outer peripheral wall, the honeycomb structure comprising cell passages along said axial length, a first partition wall and a second partition wall,
the first partition wall (i) extending along said axial length of the honeycomb structure, and (ii) extending from an interior of the honeycomb structure towards said outer peripheral wall;
and
the second partition wall at least partially surrounding said cell passages;
wherein the first partition wall has an increased thickness compared to the second partition wall,
wherein within the first partition wall there is at least one filtrate discharge conduit extending to the outer peripheral wall, and
wherein the monolithic ceramic filter is produced by a single extrusion process.

5 more elements

Dependencies are inferred from the claim text.

Monolithic ceramic filter

Life of this patent

Monolithic ceramic filter

Life of this patent

Abstract

Claims11