Patents by Inventor John Maddack

John Maddack 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 receiver sleeve
    Patent number: D364171
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: November 14, 1995
    Inventors: Andrea J. Maddack, John Maddack