Patents by Inventor Kiyoharu Kuwabara

Kiyoharu Kuwabara 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).

  • High zirconia fused refractory product
    Patent number: 4705763
    Abstract: A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis:85 to 97% of ZrO.sub.2 ;0.05 to 3% of P.sub.2 O.sub.5 ;2 to 10% of SiO.sub.2 ;0.05 to 5% of B.sub.2 O.sub.3 ; andthe content of alkali metal oxides being less than 0.1%.
    Type: Grant
    Filed: August 21, 1986
    Date of Patent: November 10, 1987
    Assignee: Asahi Glass Company Ltd.
    Inventors: Atsushi Hayashi, Kiyoharu Kuwabara, Kohzo Sakai, Toshihiro Ishino
  • High zirconia fused refractory product
    Patent number: 4336339
    Abstract: A high zirconia fused refractory product consists essentially of the following constituents analytically, on a weight basis:85% to 97% of ZrO.sub.2 ;0.1% to 3% of P.sub.2 O.sub.5 ;2% to 10% of SiO.sub.2 ;up to 3% of Al.sub.2 O.sub.3without a substantial amount of a rare earth oxide.
    Type: Grant
    Filed: February 23, 1981
    Date of Patent: June 22, 1982
    Assignee: Asahi Glass Company Ltd.
    Inventors: Masataro Okumiya, Kiyoharu Kuwabara