Patents by Inventor Dora Devorak

Dora Devorak 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).

  • Puzzle apparatus
    Patent number: 4884811
    Abstract: A puzzle apparatus utilizing a curved member having a convex outer surface and a concave inner surface. A plurality of interlocking pieces are employed, each possessing a concave surface conforming to the convex outer surface of the curved member. Each of the multiplicity of pieces includes a convex surface displaying indicia. The plurality of interlocking pieces are held to the curved outer surface to form a rendition.
    Type: Grant
    Filed: November 2, 1988
    Date of Patent: December 5, 1989
    Inventor: Dora Devorak