Patents Assigned to The Nippon Road Company Limited
  • Pavement for automobile test course
    Patent number: 6102614
    Abstract: A concrete block has a first and a second hole passing through the concrete block in a vertically direction. An internal thread is formed in the first and the second hole. A plurality of tiles have a slipping resistivity. The tiles are arranged in order on an upper surface of the concrete block. The first and the second hole each have at a level of the upper surface an open region smaller than a respective tile.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: August 15, 2000
    Assignee: The Nippon Road Company Limited
    Inventor: Wataru Yukawa