Patents by Inventor Harutoshi Yamamoto

Harutoshi Yamamoto 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).

  • Production method of machine parts and the machine parts thus produced
    Patent number: 4808486
    Abstract: A machine part such as a cylinder or a feeding screw of an injection molding machine and the like is produced such that a separating metallic plate is inserted in a mold adapted to mold the cylinder or the feeding screw, thereby providing two molding cavities on both sides of the separating plate, and melted metals adapted to form a main portion and a corrosion and wear resistant portion of the cylinder or feeding screw are poured into the two cavities. In this manner the two kinds of metals poured into the two cavities are metallurgically fused together with the separating plate interposed therebetween.
    Type: Grant
    Filed: July 6, 1987
    Date of Patent: February 28, 1989
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Harutoshi Yamamoto, Zenichi Mochizuki, Sadasue Sakomoto
  • Method of casting a machine part by fusing metal layers on both sides of a separting plate
    Patent number: 4693293
    Abstract: A machine part such as a cylinder or a feeding screw of an injection molding machine and the like is produced such that a separating metallic plate is inserted in a mold adapted to mold the cylinder or the feeding screw, thereby providing two molding cavities on both sides of the separating plate, and melted metals adapted to form a main portion and a corrosion and wear resistant portion of the cylinder or feeding screw are poured into the two cavities. In this manner the two kinds of metals poured into the two cavities are metallurgically fused together with the separating plate interposed therebetween.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: September 15, 1987
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Harutoshi Yamamoto, Sadasue Sakomoto