Patents by Inventor Dror Green

Dror Green 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: 5299805
    Abstract: A multilayer puzzle having a plurality of superposable card units in the form of polygons of identical shape and size consisting of a transparent material. Surfaces of the card units carry a plurality of distinct markings in the form of layers of various, opaque colors disposed on at least portions of at least one of the surfaces of each of the card units, leaving transparent other surface portions thereof. Through which transparent surface portions there can be perceived surface portions of at least the next-lower card unit of the plurality of card units when superposed, whereby by rotation and/or face reversal of at least one of the card units in the superposed plurality, a large number of pattern-forming combinations of the markings can be obtained, differing in colors, shapes and relative positions. At least one of the combinations on at least one face of the superposed plurality of card units may be defined as target combination to be achieved by the handler of the puzzle.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: April 5, 1994
    Inventor: Dror Green