Patents by Inventor Andrea L. Mathis

Andrea L. Mathis 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).

  • Drilling method and an assembly for performing the method
    Patent number: 5355966
    Abstract: The invention provides a drilling method for drilling a bore-hole in ground or soil, with a percussion drilling device operated directly in the bore-hole and with a rotary percussion drilling device operated from the surface of the ground or soil, both devices being received in a common support member and adapted to be simultaneously operated, and a drilling assembly for preforming this method. In order to avoid a damage of the percussion drilling device, the drilling impact forces and vibrations directed to the rotary percussion drilling device are registered, elastically dampened and absorbed prior to having an effect on the percussion drilling device.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: October 18, 1994
    Inventor: Andrea L. Mathis