Patents by Inventor Kiyoshi Yokosawa

Kiyoshi Yokosawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ceramic filter and process for making it
    Patent number: 5110470
    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.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: May 5, 1992
    Assignee: Toto Ltd.
    Inventors: Kiyoshi Yokosawa, Naohito Wajima