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Class Information
Number: 434/196
Name: Education and demonstration > Mathematics > Arithmetic > Manually manipulated elements having size proportional to numeric value > Fraction representing elements
Description: Subject matter wherein the pieces represent two numbers whose quotient is to be determined, e.g., 3/4.

Patents under this class:

Patent Number Title Of Patent Date Issued
7722356 Method and apparatus for the manipulation of fractions using transparencies May. 25, 2010
6575755 Fraction circle Jun. 10, 2003
6293800 Educational and entertainment device Sep. 25, 2001
6192594 Fraction ruler Feb. 27, 2001
5679002 Fractional-arithmetic-teaching game and method for playing Oct. 21, 1997
5597308 Assembly including interlocking components for teaching mathematical concepts Jan. 28, 1997
5470234 Circular, piece-matching math educational aid Nov. 28, 1995
5192077 Fraction illustrating polyhedron Mar. 9, 1993
5076793 Fractal mathematics kit Dec. 31, 1991
4914019 Multi-purpose learning device Apr. 3, 1990
4778390 Method and apparatus for teaching fractions Oct. 18, 1988
4730831 Game with board, playing pieces and award pieces Mar. 15, 1988
4614042 Measuring and instructional ruler device Sep. 30, 1986
3996675 Instructional birthday cake toy Dec. 14, 1976
3935649 Multi-purpose mathematical aid Feb. 3, 1976

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