Patents Assigned to Benjamin F. Du Pont
  • Stackable blocks
    Patent number: 4877407
    Abstract: A set of stackable blocks in which there is a subset of blocks each having its center of mass offset from where the center of mass would be located if the block had a uniform mass distribution. In other aspects, the distribution of mass in one block can be shifted, and the blocks bear arbitrary symbols indicative of the characteristics of their mass distributions.
    Type: Grant
    Filed: May 25, 1988
    Date of Patent: October 31, 1989
    Assignee: Benjamin F. Du Pont
    Inventors: Benjamin F. du Pont, Carl J. Sukeforth