Patents by Inventor Zdenek L. Figar

Zdenek L. Figar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus for positioning deflection wedges
    Patent number: 4305462
    Abstract: A deflection wedge is positioned in a long horizontal drill hole by securing it with a shear pin to an extension on a drill string. The extension is turned independently of the drill string to enable a droparm mechanism to actuate a trigger which stops rotation at a predetermined orientation. Rotation is effected by means of a rifle bar mechanism. The rifle bar presses against the bottom of the hole to cause rotation and the trigger declutches the rifle nut when the droparm drops.
    Type: Grant
    Filed: February 16, 1979
    Date of Patent: December 15, 1981
    Assignee: Boart International Limited
    Inventors: Wulf Eilers, Zdenek L. Figar, Johan G. Grabe, Stanley J. Landers, David S. Williams