Patents by Inventor Kenji Kobomura

Kenji Kobomura 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).

  • Unidirectional prepreg and carbon fiber reinforced composite materials comprising pitch-based carbon fibers and polyacrylonitrile-based carbon fibers
    Patent number: 5552214
    Abstract: A pitch-based carbon fiber reinforced composite material is improved with regard to its compressive strength and compression strain at failure by combining polyacrylonitrile-based carbon fibers. The pitch-based carbon fibers have a modulus in tension of not less than 400 GPa, a tensile strength of not less than 2000 MPa, a compressive strength as a unidirectionally reinforced composite material of 100 MPa to 800 MPa and a fiber diameter of 4 .mu.m to 15 .mu.m and the polyacrylonitrile-based carbon fibers have a modulus in tension of not less than 200 GPa, a compressive strength and compression strain at failure as a unidirectionally reinforced composite material larger than those of the pitch-based carbon fibers, and a fiber diameter smaller than that of the pitch-based carbon fibers.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: September 3, 1996
    Assignees: Nippon Steel Corporation, Nippon Steel Chemical Co., Ltd.
    Inventors: Kenji Kobomura, Hiromi Kimura, Hideo Osone, Mikio Shima, Michiya Hayashida, Nobuyuki Tsuji