Patents by Inventor Norman A. Lessiter

Norman A. Lessiter 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).

  • Electrical connectors including power failure warning means
    Patent number: 4155082
    Abstract: An audible warning device is integrated within an electrical connector in the form of a mains plug or mains adaptor to produce an audible warning in the absence of the mains supply. The plug or adaptor may incorporate further circuits for producing distinctive warnings should the power supply be subsequently reconnected, and also should the voltage of an internal battery powering the device drop below a predetermined value. In the case of an adaptor, the device has such internal connections that a warning will be produced if the power supply plug becomes disconnected from the adaptor, the adaptor from the power supply socket, or both.
    Type: Grant
    Filed: November 16, 1977
    Date of Patent: May 15, 1979
    Assignee: Ian C. Jones and Leonard G. McDowell
    Inventors: Ian C. Jones, Leonard G. McDowell, Norman A. Lessiter