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:
May. 05, 1992
Filed:
Oct. 25, 1990
Kiyoshi Yokosawa, Kanagawa, JP;
Naohito Wajima, Kanagawa, JP;
Toto Ltd., , JP;
Abstract
A ceramic filter having good permeability and a superior durability, and a process for manufacturing the same. This filter comprises a porous support made of a ceramic, a fine intermediate layer formed on one surface of said support and comprised of at least one kind of particles selected from particles of SnO.sub.2, TiO.sub.2, ZrO.sub.2 or CeO.sub.2 and having a particle diameter of not more than 500 .ANG., and a thin film formed on the surface of said fine intermediate layer and comprised of at least one particles selected from particles of SnO.sub.2, TiO.sub.2, ZrO.sub.2 or CeO.sub.2 and having a particle diameter of not more than 300 .ANG. and smaller than the particle diameter of the particles that constitute said fine intermediate layer.