Patents by Inventor Hirohiko Takagi

Hirohiko Takagi 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).

  • Metal cords and pneumatic tires using the same
    Patent number: 4836262
    Abstract: A metal cord is constructed by twisting three metal filaments in the same direction, and satisfies Lmax.gtoreq.1.05d, Lmin.gtoreq.1d and Lmax/Lmin.gtoreq.1.05 (Lmax : center distance between longest separated metal filaments, Lmin : center distance between shortest separated metal filaments, d : diameter of metal filament), and has specified twisting pitch and elongation under a load of 5 kg/cord. A pneumatic tire comprises a belt composed of plural belt layers each containing the above metal cords arranged at a given inclination angle with respect to the circumferential direction of the tire.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: June 6, 1989
    Assignee: Bridgestone Corporation
    Inventors: Kuninori Nishizawa, Teruo Miura, Yoichi Watanabe, Hirohiko Takagi
  • Rubber-cord composite bodies
    Patent number: 4818601
    Abstract: A rubber-cord composite body used for cord reinforcing rubber articles is produced by embedding fiber cords treated with an epoxy compound and further with a particular resorcin-formaldehyde-rubber latex adhesive into a particular rubber composition containing 0.5.about.10 parts by weight of each of a bismaleimide compound and sulfur.
    Type: Grant
    Filed: February 9, 1988
    Date of Patent: April 4, 1989
    Assignee: Bridgestone Corporation
    Inventors: Michio Itoh, Tadashi Saito, Nobuyuki Okamura, Hisao Yamamoto, Yutaka Iseda, Hirohiko Takagi