Patents Assigned to The Toyo Rubber Co., Ltd.
  • Pneumatic tire with an internal damage indicator
    Patent number: 4144921
    Abstract: Projections made of a different and less abrasion resistant kind of rubber to that constituting the exterior of the tire are arranged to contact the road during low pressure conditions, whereby the amount of rubber worn off indicates the amount of fatigue accumulated and degree of internal damage done by running the tire at that pressure.
    Type: Grant
    Filed: March 1, 1977
    Date of Patent: March 20, 1979
    Assignees: Nissan Motor Company, Limited, The Toyo Rubber Co., Ltd.
    Inventors: Keiichiro Yabuta, Nagayuki Marumo, Yoichi Shimabara, Masahiro Ishigaki, Ken Ishihara, Yoshiki Mayama