Patents by Inventor Gen Katagiri

Gen Katagiri 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).

  • Carbon fiber made from acrylic fiber and process for production thereof
    Patent number: 5348802
    Abstract: Disclosed is a carbon fiber made from an acrylic fiber, the carbon crystal of which has a crystal size Lc of 15 to 65 .ANG. as determined by the wide angle X-ray diffractometry. This carbon fiber has regions with a lower crystallinity in the surface layer portion thereof than that of the central portion thereof, and the compressive strength .sigma..sub.cf (GPa) of the single filament thereof determined by the loop method satisfies formula (I):.sigma..sub.cf .gtoreq.10.78-0.1176.times. Lc (I).The carbon fiber is produced by ionizing in vacuo an atom or molecule which is solid or gaseous at normal temperature, accelerating the ionized atom or molecule by an electric field, and implanting the accelerated ionized atom or molecule in a bundle of carbon fibers.
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: September 20, 1994
    Assignees: Toray Industries, Inc., Toray Research Center, Inc.
    Inventors: Yoji Matsuhisa, Toru Hiramatsu, Kazuo Yoshida, Gen Katagiri