Patents by Inventor Ivan E. Wilkerson

Ivan E. Wilkerson 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).

  • Valve actuator two rotor three position indicator
    Patent number: 4940011
    Abstract: A two-rotor, three-position indicator for a valve actuator is connected to receive rotary input from at least two independently operating rotors connected inside the geared limit switch of a valve actuator. Individual drive lugs moved interconnected gearing to cause a pointer to indicate whether the valve stem is open, closed or in-between those two oppositely disposed limits.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: July 10, 1990
    Assignee: Limitorque Corporation
    Inventors: Ivan E. Wilkerson, Robert W. Auxier