Patents by Inventor Udo Krell

Udo Krell 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: 4600199
    Abstract: A three dimensional toy puzzle of the type wherein the pieces of the puzzle which are formed in layers can be slidably moved about the surface of an inner fastening means. The puzzle has an outer configuration of a crystal with each layer or face thereof having a particular color or indicia to indicate the positioning of each piece contained therein. Another embodiment discloses a puzzle in the shape of a 5 by 5 cube positioned about the inner fastening means with each face of the cube having a particular indicia or other identifying characteristic, and each layer of the puzzle capable of rotation about X, Y and Z axis thereof.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: July 15, 1986
    Inventor: Udo Krell