Patents by Inventor Walter F. Torfs

Walter F. Torfs 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).

  • Rotary drive assemblies
    Patent number: 5348104
    Abstract: A well assembly including a drive string, a frame, a spindle mounted on the frame and means for rotating the spindle, is constructed to allow the upper end of the string to pass through the spindle. A nut with a non-circular downward protuberance is tightly, threadably engaged with the upper end of the drive stung. The spindle has a non-circular upward protuberance, and a tail bar snugly receives both protuberances. The tail bar supports the weight of the string and transmits rotary torque from the spindle to the string.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: September 20, 1994
    Inventor: Walter F. Torfs