Patents by Inventor Yoshitsugu Nakama

Yoshitsugu Nakama 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).

  • Building block kit
    Patent number: 4753622
    Abstract: A set of building blocks is provided, each of identical size and shape. The block is of monolithic structure of elongated prismatic shape bounded by six flat faces and having an isosceles trapezoidal cross-sectional configuration. When properly arranged, interesting built structures are produced, especially when the faces of the blocks are of different colors.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: June 28, 1988
    Inventor: Yoshitsugu Nakama