Patents by Inventor Michael A. Keffer

Michael A. Keffer 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).

  • Linear Drive Assembly with Rotary Union for Well Head Applications and Method Implemented Thereby
    Publication number: 20080257555
    Abstract: A drive assembly for a progressive cavity pump includes a frame supported by the wel piping and a polish rod connected to the sucker rod. The polish rod is received by a rotary union formed by a sleeve portion rotatable with respect to a body portion with a seal structure that seals the sleeve and body portions during rotation. A mechanical drive, such as a hydraulic motor, electric motor or engine, has an output shaft that is linear with the polish rod and that has an axial passageway which receives the polish rod. A coupler mechanically couples an upper portion of the polish rod to the output shaft. The invention also includes a method of rotating a progressive cavity pump by this assembly.
    Type: Application
    Filed: July 6, 2004
    Publication date: October 23, 2008
    Inventors: Carl G. Waldenstrom, Michael A. Keffer