Patents by Inventor Fred D. Leeson

Fred D. Leeson 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).

  • Conferencing telephone unit
    Patent number: D259786
    Type: Grant
    Filed: October 3, 1978
    Date of Patent: July 7, 1981
    Assignee: Northern Telecom Limited
    Inventors: Fred D. Leeson, Henry A. Main, Clifford D. Read