Patents by Inventor William N. Rheams

William N. Rheams 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 aid for mathematics
    Patent number: 5338203
    Abstract: Mathematics teaching aid for recognition of numerical and functional equivalents and spatial relationships having tiles (12, 14, 16) marked with numerals (12) , functions (14) , and equals (16) and a baseboard (10) with intersecting rows of spaces where two to four students can form linear equations (18) by aligning the proper tiles on the baseboard (10) which intersect at right angles and share one tile.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: August 16, 1994
    Inventor: William N. Rheams