Patents by Inventor John E. Gillis

John E. Gillis 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).

  • Liquid level switch
    Patent number: 5578994
    Abstract: A piezoelectric liquid level switch is provided which can be made immune to standing wave effects and provides an unequivocal response to liquid contact.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: November 26, 1996
    Assignee: Milltronics Ltd.
    Inventors: Bogdan Cherek, John E. Gillis