Patents Assigned to Bridgestone Bekaert Steel Cord Co., Ltd.
  • Steel cords for the reinforcement of rubber articles
    Patent number: 5609013
    Abstract: A steel cord for the reinforcement of rubber articles is formed by twisting plural filament wires of a high carbon steel. In this case, the filament wire is drawn from a wire rod so as to satisfy a relationship of T.gtoreq.230-148 logD (wherein D is a diameter of the filament wire and T is a tensile strength of the filament wire) and a difference in tensile strength between a surface layer portion and an internal portion in the filament wire of not more than 80 kgf/mm.sup.2.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: March 11, 1997
    Assignee: Bridgestone Bekaert Steel Cord Co., Ltd.
    Inventors: Akihiro Kaneda, Koichi Yokota, Masao Nakamura
  • Composite rubber bodies using steel cords for the reinforcement of rubber articles
    Patent number: 5603208
    Abstract: A composite rubber body is formed by embedding steel cords in rubber and vulcanization-building them. In this case, each of the steel cords is a single steel filament wire or plural twisted steel filament wires obtained by drawing of a wire rod of high carbon steel having a given composition. The filament wires satisfy given relationships between filament diameter and tensile strength before and after the vulcanization and have a retention of loop strength of not less than 55%.
    Type: Grant
    Filed: February 15, 1995
    Date of Patent: February 18, 1997
    Assignee: Bridgestone Bekaert Steel Cord Co., Ltd.
    Inventors: Masuhiro Fujita, Hironori Sakaguchi, Akihiro Kaneda
  • Reinforcing steel cords
    Patent number: 4938015
    Abstract: A steel cord for the reinforcement of rubber products and the like has an open twisted structure comprised of 3 to 6 steel filaments each having an ellipsoidally helical shape, and has a particular tensile elongation under a load of 5 kg.
    Type: Grant
    Filed: July 7, 1989
    Date of Patent: July 3, 1990
    Assignee: Bridgestone Bekaert Steel Cord Co., Ltd.
    Inventor: Mitsuru Kinoshita