Patents Assigned to Tardif & Frere (1993)
  • Earth leveling apparatus
    Patent number: 5737859
    Abstract: An earth leveling apparatus includes a vehicle having runners for movement in an operative direction, an elongated screw mounted to the vehicle and rotatable on its axis, and extending transversely of the operative direction of movement of the vehicle, and an apparatus for rotating the screw, the screw having a spiral blade with an edge adapted to engage earth to move it along the length of the screw as the vehicle advances in the operative direction so as to level the earth.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: April 14, 1998
    Assignee: Tardif & Frere (1993)
    Inventor: Jean-Roch Tardif