Patents by Inventor Hiromichi Itoshima

Hiromichi Itoshima 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 and apparatus for producing thick welded steel pipe
    Patent number: 4339941
    Abstract: For producing steel pipe from thick steel plate, a foreign member is arranged on a die at the center of its caliber in the length thereof such that the member meets the edge groove of the steel, and in such a condition O-ing is carried out thereon, thereby to produce a thick welded pipe having very little the peaking amount.
    Type: Grant
    Filed: May 9, 1980
    Date of Patent: July 20, 1982
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Tadaaki Taira, Toshio Ishihara, Hiromichi Itoshima, Yutaka Mihara, Takashi Kogawa