Patents by Inventor Charles E. Wilcox

Charles E. Wilcox 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).

  • Educational mathematics game
    Patent number: 4334869
    Abstract: An educational puzzle that teaches mathematics; the puzzle including a gameboard in the form of a tray, and a plurality of blocks placeable therein, each block being printed with a single numerical digit, and the blocks being arranged in horizontal and vertical rows so as to form a table from "1" to "9" in each direction, and the tray being divided by a central partition having a central gate.
    Type: Grant
    Filed: May 30, 1980
    Date of Patent: June 15, 1982
    Inventors: Charles E. Wilcox, George Spector