Patents by Inventor Fred H. Klopfenstein

Fred H. Klopfenstein 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).

  • Cube puzzle
    Patent number: 4189151
    Abstract: An educational cube puzzle game comprising sixteen cubes, eight of one color combination and eight of a second color combination. The first set of cubes has a first arrangement of colors having six different colors, one on each face. The second set of eight cubes also has a different color on each face and also contains the same six colors but the arrangement of the colors is different from the first set of cubes.
    Type: Grant
    Filed: October 23, 1978
    Date of Patent: February 19, 1980
    Inventor: Fred H. Klopfenstein