Patents by Inventor Isao Tomi

Isao Tomi 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).

  • Process for manufacturing fine zirconium oxide powder
    Patent number: 4985229
    Abstract: A process for manufacturing fine zirconium oxide powder comprises adding a hydroxide of at least one metal selected from calcium, magnesium, yttrium and a lanthanide series element to a zirconia sol, which is dehydrated, dried and calcined. A zirconia sol prepared by hydrolyzing under heating an aqueous solution containing a zirconium salt, zirconium hydroxide or zirconia hydrate and then filtering the hydrolized aqueous solution through a ultra-filtration membrane is preferably used.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: January 15, 1991
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Masamichi Obitsu, Isao Tomi, Takao Kaga