Patents by Inventor Eizo Takeuchi

Eizo Takeuchi 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 for working the ends of steel pipe by upsetting and pressing
    Patent number: 4845972
    Abstract: A method for working at least one end of a steel pipe by upsetting and pressing which comprises an external upset portion having an outer taper being shaped by upset forging, the portion then being pressed by an internal upset die so as to displace the outer taper to an internal upset portion having an inner taper and then internal upset forging being applied by the internal upset die, thereby forming accurately the length of the inner taper and the curvature of a starting point of the portion having the inner taper.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: July 11, 1989
    Assignee: Nippon Steel Corp.
    Inventors: Eizo Takeuchi, Hisamitsu Miyoshi, Keiichiro Mori