Patents by Inventor Yuhzoh Harada

Yuhzoh Harada 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 hollow billet and apparatus therefor
    Patent number: 4875519
    Abstract: A method and apparatus utilizing a core is located at a central portion of a molten metal storing portion in a vertical semi-continuous mold. The molten metal is poured into the molten metal storing portion, and casting takes place with the inner diameter of a solidified distal portion of the molten metal being controlled by a distal portion of the core. This approach provides a reliable method for the manufacture of high-quality hollow billets which are free from internal defects.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: October 24, 1989
    Assignee: Furukawa Aluminum Co., Ltd.
    Inventors: Yoh Ishii, Masami Abe, Yuhzoh Harada, Atsumi Takasugi, Kazumi Kato