Patents by Inventor Randal D. Prowizor

Randal D. Prowizor 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).

  • Ear plug
    Patent number: D591416
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: April 28, 2009
    Inventors: Randal D. Prowizor, Robert J. Randle