Patents by Inventor Louis Y. Sher

Louis Y. Sher 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).

  • Circular, piece-matching math educational aid
    Patent number: 5470234
    Abstract: A design for a circular, piece-matching math educational aid is disclosed. It contains a holding plate and various fraction pieces. The circular holding plate has a clockwise spiral bottom, designed in such a way that a sloped cliff is formed at the joint of the starting and ending point. The edge of the cliff is lined up with a guiding mark "0" on a fraction scale marked on an elevated wall on the outer circumference of the holding plate. The fraction pieces contain numerous pie-shaped segments. Any of the segments can precisely depict a fraction, based on the ratio of its center angle to the circle, 360 degrees. The pieces can be made with any center angles, such as 5, 7.5, 10, 30, 45, 60, 90, 180 degrees, etc.
    Type: Grant
    Filed: June 16, 1994
    Date of Patent: November 28, 1995
    Inventor: Louis Y. Sher
  • Toy building block
    Patent number: D336320
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: June 8, 1993
    Inventor: Louis Y. Sher
  • Toy building block
    Patent number: D343426
    Type: Grant
    Filed: January 13, 1992
    Date of Patent: January 18, 1994
    Inventor: Louis Y. Sher
  • Toy building block
    Patent number: D343427
    Type: Grant
    Filed: January 13, 1992
    Date of Patent: January 18, 1994
    Inventor: Louis Y. Sher
  • Toy building block
    Patent number: D352077
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: November 1, 1994
    Inventor: Louis Y. Sher