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Class Information
Number: 434/215
Name: Education and demonstration > Mathematics > Geometry, trigonometry, or physical mathematic model structure > Demonstration means using relatively turnable elements
Description: Subject matter demonstrated by a means including elements that turn relative to each other.

Patents under this class:

Patent Number Title Of Patent Date Issued
8437688 Test and answer key generation system and method May. 7, 2013
7748129 Apparatus and method for measuring the trigonometric cosine and trigonometric sine of an angle Jul. 6, 2010
6872078 Teaching cylinder instrument Mar. 29, 2005
6582234 Method for demonstrating the inverse square law and apparatus therefor Jun. 24, 2003
6213779 Conic section activity boards Apr. 10, 2001
6132217 Method and apparatus for teaching relationship of trigonometric functions between unit circle and rectangular coordinate system Oct. 17, 2000
5775015 Location recorder process and assembly Jul. 7, 1998
5281145 Pictorial image transforming manipulatives Jan. 25, 1994
5205747 Bead calculator educational toy Apr. 27, 1993
5114347 Mathematical function demonstrator boards May. 19, 1992
4920033 Rotatable disk teaching apparatus Apr. 24, 1990
4705478 Superimposed transparencies used in education Nov. 10, 1987
4676754 Visual aid for teaching linear relationships Jun. 30, 1987
4461480 Educational entertainment device comprising cubes formed of four 1/8th octahedron sections rotatably coupled to a tetrahedron Jul. 24, 1984
4435162 Trigonometry visualizers and method of making same Mar. 6, 1984

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