Patents by Inventor Sam H. Doyal

Sam H. Doyal 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).

  • Ring post puzzle
    Patent number: D334035
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: March 16, 1993
    Inventor: Sam H. Doyal