Patents by Inventor Ryuzo Osawa

Ryuzo Osawa 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).

  • Corrosion resistant steel cords and pneumatic tires reinforced with same
    Patent number: 6102095
    Abstract: A corrosion resistant steel cord for reinforcing rubber articles, particularly a belt and/or carcass of a pneumatic tire, has a residual compressive stress inside the twisting helix of each steel filament such that a ratio R.sub.1 /R.sub.0 is less than one, where R.sub.0 is the radius of curvature of a helix in each helically formed steel filament obtained by untwisting of the cord and R.sub.1 is the radius of curvature of the helix after removal of a surface layer from the inside of the helix in the steel filament. The steel filaments have a tensile strength of 4,000-4,800 N/mm.sup.2.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: August 15, 2000
    Assignees: Bridgestone Corporation, Bridgestone Metalpha Corporation
    Inventors: Naohiko Obana, Yoshikazu Kaneko, Ryuzo Osawa
  • Polyaniline
    Patent number: 4904553
    Abstract: A polyaniline is highly conductive and less corrosive when it contains up to 7 mol % of benzenoid-ammonium salt state and up to 25 mol % of quinoid-diimine state, based on the total molar amount of the polyaniline.
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: February 27, 1990
    Assignee: Bridgestone Corporation
    Inventors: Tadashi Nakajima, Shinichi Toyosawa, Shigeru Kijima, Katsuhiko Arai, Yuko Maeda, Masao Ogawa, Takahiro Kawagoe, Yasuhiro Iino, Ryuzo Osawa, Yuichi Ishino
  • Method of mixing and kneading control of a rubber kneader
    Patent number: 4076220
    Abstract: A method of mixing and kneading control of a rubber kneader comprising the steps of detecting the plasticity of a rubber raw material after the rubber raw material and additives are put into a receptacle of the rubber kneader, and controlling total energy spent by the electric motor of the rubber kneader and total revolutions of a mixing and kneading rotor of the rubber kneader in correspondence with the detected plasticity of the rubber raw material.
    Type: Grant
    Filed: February 10, 1976
    Date of Patent: February 28, 1978
    Assignee: Bridgestone Tire Company Limited
    Inventors: Katsutoshi Nakashima, Toshio Kita, Ryuzo Osawa, Takashi Hatanaka