Patents by Inventor George M. Spencer

George M. Spencer 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).

  • Method and apparatus for non-invasive monitoring of solenoid valves
    Patent number: 5477149
    Abstract: A non-invasive apparatus and method is disclosed which is adapted for testing of solenoid valves to verify valve operation. The non-invasive apparatus and method monitors with time both the stroke of the solenoid valve plunger to identify associated impacts and the state of the solenoid valve as being energized or de-energized to determine valve operability.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: December 19, 1995
    Inventors: George M. Spencer, John W. McElroy, Michael H. Lind