Patents Assigned to Samon Yanagimoto
  • Method of producing seamless steel tube
    Patent number: 4006618
    Abstract: In a method of producing seamless steel tube from billet having a square or rectangular cross-section by the step of piercing a workpiece and rolling steps following the piercing step, each of such steps being conducted with a plug held by a mandrel toward the center of cross section of the workpiece while the workpiece is rolled by a pair of rolls with axes arranged horizontally.
    Type: Grant
    Filed: July 21, 1975
    Date of Patent: February 8, 1977
    Assignees: Samon Yanagimoto, Nippon Steel Corporation
    Inventors: Samon Yanagimoto, Minoru Kawaharada, Seishiro Yoshiwara, Susumu Mizunuma, Motoaki Sugiyama