Patents by Inventor Alan Peter Barkman

Alan Peter Barkman 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).

  • Paving stone
    Patent number: D634859
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: March 22, 2011
    Assignee: Barkman Concrete Ltd.
    Inventor: Alan Peter Barkman