Patents by Inventor Hidefumi Hata

Hidefumi Hata 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).

  • Game cards for playing a game and for learning arithmetic
    Patent number: 5242171
    Abstract: A set of game cards includes a plurality of first cards respectively indicating each number from 1 to 9, and a plurality of second cards each indicating a figure generated by multiplying together figures, respectively indicated on arbitrary first cards. Thus, the game cards help players learn multiplication tables when they are used.
    Type: Grant
    Filed: January 6, 1992
    Date of Patent: September 7, 1993
    Assignee: Good Game Limited Responsibility Company
    Inventor: Hidefumi Hata