Patents by Inventor Joel M. Mayhugh

Joel M. Mayhugh 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).

  • Stabilized speed-control system for a hydrostatic transmission
    Patent number: 5355675
    Abstract: A hydrostatic rotary power transmission system that provides a stable rotation rate at very slow rotation speeds is provided. The system operates in two speed control modes, one being a normal mode for use in the rotation rate range of 50 rpm to the maximum rated speed and a second or fine speed control mode for use in the rotation range of <1.0 to 250 rpm. In the normal control mode, the rotation speed is a function of the displacement of the hydrostatic pump. In the fine speed control mode, the motor rotation rate is a function of the flow rate through a proportional-flow valve that is downstream of the motor.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 18, 1994
    Assignee: Western Atlas International, Inc.
    Inventors: Joel M. Mayhugh, Georgios L. Varsamis