Patents by Inventor David Roy Hutchings

David Roy Hutchings 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).

  • Dual nature puzzle pieces
    Patent number: 4113256
    Abstract: Two three-dimensional shapes are described. The shapes may be used together both for the working of space-relational puzzles and for the working of many and various tile-like designs.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: September 12, 1978
    Inventor: David Roy Hutchings