Patents by Inventor Charles N. Barnett

Charles N. Barnett 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).

  • Water quality indicating apparatus having self-cleaning test probes
    Patent number: 6078178
    Abstract: Water purity indicating apparatus is adapted to operate on AC input power and includes a housing and a pair of test probes extending from the housing for measuring a resistance of water. Also included is a circuit connected to the test probes and provided within the housing for outputting a signal indicating a purity level of the water based on a first AC voltage generated as a result of the measured resistance of the water.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: June 20, 2000
    Assignee: U.S. Filter Corporation
    Inventor: Charles N. Barnett