Patents by Inventor Jeffrey R. McQuinn

Jeffrey R. McQuinn 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).

  • Telephone headset interface circuit
    Patent number: 4782524
    Abstract: An interface circuit interfaces a four wire telephone circuit to a telephone headset. An adjustable receiver portion of the interface circuit receives a line input signal from the four wire circuit and produces a headset input signal limited to a predetermined signal level. An adjustable output portion of the interface circuit accepts a headset output signal and conditions it for use as a line output signal on the four wire circuit. A DC voltage is also supplied to a headset microphone through the output portion of the interface circuit.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: November 1, 1988
    Assignee: Rockwell International Corporation
    Inventors: Jeffrey R. McQuinn, Robert Anderson