Patents by Inventor Peter J. Hartwell

Peter J. Hartwell 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).

  • Toy rock and sand garden
    Patent number: D319851
    Type: Grant
    Filed: April 25, 1989
    Date of Patent: September 10, 1991
    Inventor: Peter J. Hartwell