Patents by Inventor Seiichi Sasahira

Seiichi Sasahira 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 manufacturing metal pipe
    Patent number: 4148426
    Abstract: A method and apparatus for manufacturing metal pipe. The edges of a metal plate are bent up slightly, and the thus bent plate is then bent into a U-shape cross-section blank. The U-shape blank is finish-formed into an O-shaped blank with the longitudinal edges opposed to each other in a position for welding by placing one end of the U-shaped blank into at least one two-part die the parts of which are movable toward and away from each other.
    Type: Grant
    Filed: August 31, 1977
    Date of Patent: April 10, 1979
    Assignee: Nippon Steel Corporation
    Inventors: Wataru Midzutani, Toshio Kikuma, Koe Nakajima, Seiichi Sasahira
  • Method of and apparatus for straightening steel sections
    Patent number: 4022046
    Abstract: In straightening steel sections, a machine is used having straightening rollers and pressing rollers each formed with a contact surface and arranged oppositely on vertical line of the straightening rollers. The cross-section of the steel section to be straightened is held between the contact surfaces of the rollers, and the pressing rollers are displaceable in the reduction direction as well as in the axial direction to adjust the amount of displacement.
    Type: Grant
    Filed: January 21, 1976
    Date of Patent: May 10, 1977
    Assignee: Nippon Steel Corporation
    Inventors: Shizuo Serizawa, Seiichi Sasahira