Patents by Inventor James E. Dawdy

James E. Dawdy 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).

  • Apparatus for detecting loss of AC power supply and loss of current
    Patent number: 4389640
    Abstract: Apparatus for detecting loss of AC power supply for an electrical conductor and loss of current through the electrical conductor when the power supply is connected thereto comprises voltage responsive means operable to produce a voltage present signal when the power supply is connected to the electrical conductor and a predetermined voltage is present across the conductor and a voltage absent signal when the predetermined voltage is not present across the conductor, and current responsive means operable to produce a current present signal when a predetermined current is flowing through the conductor and a current absent signal when the predetermined current is not flowing through the conductor.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: June 21, 1983
    Assignee: Sutherland-Schultz Limited
    Inventor: James E. Dawdy