Patents by Inventor Yasujiro Koyama

Yasujiro Koyama 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).

  • Prevention of thermal spalling in ceramic products
    Patent number: 4334858
    Abstract: Ceramic product is heated or cooled at its side to impart temperature gradient for causing sinter so as to in advance provide residual stress in inside, thereby to prevent thermal spalling which is generated by difference in temperature during using the ceramic product.
    Type: Grant
    Filed: July 24, 1980
    Date of Patent: June 15, 1982
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Makoto Iiyama, Yasujiro Koyama
  • Refractory checkerwork
    Patent number: 4075812
    Abstract: The refractory checkers can be saved from damage or breakdown by introducing a layer of a material having suitable compressive deformability, between overlapping brick surfaces.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: February 28, 1978
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Yasujiro Koyama, Fukuichi Kitani, Masaaki Nishi