Patents by Inventor Tomoo Miyasaka

Tomoo Miyasaka 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).

  • Method of manufacturing a rock bit cone
    Patent number: 4667543
    Abstract: A method of manufacturing a rock bit cone having a substantially conical body on a surface of which a number of teeth are formed is manufactured by pressure-casting with using a casting mold having a molding surface including a cone body defining surface portion and tooth defining surface portions, pouring a molten metal of very hard and low melting point alloy having a melting point of 1040.degree.-1120.degree. C. and Rockwell hardness of 55-65 to the casting mold to centrifugal-cast at least a predetermined area including a tip of each tooth with the hard metal, and pouring a molten tough metal to the casting mold to centrifugal-cast the cone body.
    Type: Grant
    Filed: May 8, 1986
    Date of Patent: May 26, 1987
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Shoichiro Tsugaki, Tomoo Miyasaka, Yukio Nishiyama, Toshio Atsuta