Patents by Inventor John Douglas Campbell

John Douglas Campbell 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).

  • Clip for an animal housing
    Patent number: D727713
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: April 28, 2015
    Assignee: Mid-West Metal Products Co., Inc.
    Inventors: Michael E. Greene, Terrance L. Jones, Stew Kerr, John Douglas Campbell