Patents by Inventor Seiichi Akizawa

Seiichi Akizawa 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).

  • Bent pipe having sectional form of high strength
    Patent number: 5339868
    Abstract: A bent pipe to which external force, such as an internal pressure and a bending moment, is applied singly or in combination, characterized in that the relationship among the outside diameter D.sub.0 of the bent part, the radius of curvature R of the bent part, the outside diameter D.sub.0 of the straight part, the wall thickness T.sub.0 of the straight part, the central cross section angle .phi. of the bent part and the wall thickness t of the pipe, is in the range defined by the following equations (1) and (2): ##EQU1## whereby the bent pipe has a sectional form of high strength.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: August 23, 1994
    Assignee: Nippon Steel Corporation
    Inventors: Hisashi Naoi, Yasusuke Inoue, Tetsuo Nagasaka, Yoichi Matsubara, Masaaki Takagishi, Seiichi Akizawa