Patents by Inventor Kazuhisa Kumekawa

Kazuhisa Kumekawa 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 of and apparatus for forging hollow blank member
    Patent number: 4561274
    Abstract: A method of and an apparatus for shaping a hollow blank member by a forging operation is provided. The interior of a hollow blank member is filled with a liquid pressure medium which is enclosed therein in sealed condition. An external pressure is applied to the hollow blank member, and the pressure of the pressure medium is maintained as an internal pressure which opposes the external pressure, and part of the pressure medium is discharged externally while applying a desired plastic deformation to the hollow blank member.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: December 31, 1985
    Assignee: Jidosha Kiki Co., Ltd.
    Inventors: Kazuhisa Kumekawa, Shinichi Ando