Patents by Inventor Gary B. Sellers

Gary B. Sellers 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).

  • Microprocessor based capacitance level detection system
    Patent number: 4383444
    Abstract: An improved level measuring system based upon capacitance to current conversion is provided with equipment for compensating for variations in dielectric constant in a measured liquid. A reference probe is located entirely within the liquid to be measured, but is sensitive to changes in dielectric constant. The measurement probe responds both to changes in dielectric constant and variations in liquid level. A differential output from the reference probe and the measurement probe effectuates compensation for variations in the dielectric constant in the material measured. A control unit at the output provides means for automatic calibration through a microprocessor.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: May 17, 1983
    Assignee: Robertshaw Controls Company
    Inventors: Norman V. Beaman, Gary B. Sellers