Patents Assigned to Sanko Corporation Ltd.
  • Cutting blade and method for cutting pavement in a circle
    Patent number: 6755481
    Abstract: A method for cutting pavement of an asphalt road or a concrete road in a circle for installation of a manhole, by using a cutting blade which has a pavement cutting edge serves as a tip for cutting the pavement and side edges serve as an inclined cutting surface to bore an inside of the pavement cut by the pavement cutting edge, thereby cutting the pavement in a frusto-conical shape.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: June 29, 2004
    Assignee: Sanko Corporation Ltd.
    Inventor: Isami Katsumoto