Patents Represented by Attorney, Agent or Law Firm Westerman, Hattori
  • Road surface roughness measuring device
    Patent number: 6679106
    Abstract: The object of the present invention is to provide a road surface roughness measuring apparatus for measuring the coefficient of dynamic friction and the roughness of the road surface in each direction at a same section where the coefficient of dynamic friction is measured, said apparatus divides the measuring circle on the road surface into a plurality of sections, on which measuring circle the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: January 20, 2004
    Assignee: Nippo Sangyo Co., Ltd.
    Inventors: Hironari Abe, Toshio Sawa, Atsushi Kasahara