Patents by Inventor Harry Frederick Druce

Harry Frederick Druce 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).

  • Patent number: 5836587
    Abstract: A pack of playing cards for an educational game comprises a number of sets of cards exactly equal to the number of faces on a die. Each card has a front and rear face, each rear face being identical to each other. Each card has disposed on the front face at least one question and answer and a depiction of at least one die-face, the number represented by the die-face being credited to a player correctly answering the question on the card during the game. Each card of each set has disposed thereon the depiction of the same die-face, the die-face being different in each set, and there being equal numbers of cards in each set.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: November 17, 1998
    Inventors: Harry Frederick Druce, John Michael Druce