Patents by Inventor Charles R. Garrigus

Charles R. Garrigus 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).

  • Conference microphone
    Patent number: D257346
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: October 14, 1980
    Assignee: The Astatic Corporation
    Inventors: Charles R. Garrigus, Gary L. Over, Henry J. Cvetko