Patents by Inventor David Oliver Butler

David Oliver 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).

  • Line fastening device
    Patent number: D732943
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: June 30, 2015
    Inventor: David Oliver Butler