Patents by Inventor Richard M. Stilwell

Richard M. Stilwell 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).

  • Self alarming five single electrodes conductivity cell
    Patent number: 4362994
    Abstract: A cell for measuring the conductivity of liquids flowing through the cell utilizing the Kelvin four-electrode system, plus a guard electrode, and a circuit to operate an alarm when the operating electrodes have reached a predetermined state of fouling. Thus, the invention cell self alarms when it has been fouled to the point where operating results will thereafter be impaired.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: December 7, 1982
    Assignee: Chemed Corporation
    Inventors: Herbert Goldsmith, Richard M. Stilwell