Patents by Inventor William N. Butler

William N. Butler 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).

  • Patent number: D352312
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: November 8, 1994
    Inventor: William N. Butler