Patents by Inventor Hirozo Obata

Hirozo Obata 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).

  • Cage-roll unit for metal pipe forming
    Patent number: 4299108
    Abstract: A metal pipe forming mill progressively forms a flat metal sheet into a circular form along the mill axis by forming rolls including pairs of cage rolls. A cage-roll unit in this type of mill has a pair of movable bases disposed on both sides of the mill axis, with the space between the two movable bases being freely adjustable, and a pair of stands mounted on the movable bases, one on each. The stands rotatably support, on their surfaces facing the mill axis, two or more pairs of cage rolls, one pair following another along the mill line.
    Type: Grant
    Filed: September 6, 1979
    Date of Patent: November 10, 1981
    Assignee: Nippon Steel Corporation
    Inventors: Masashi Kato, Hirozo Obata, Minoru Hirata, Hitoshi Matsukuma, Kunio Ishikawa, Junichi Tanaka