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Class Information
Number: 434/214
Name: Education and demonstration > Mathematics > Geometry, trigonometry, or physical mathematic model structure > Property of circle or ellipse
Description: Subject matter relating to characteristics of a closed plane curve every point of which is equidistant from a fixed point within the curve, or characteristics of a closed plane curve generated about two points in such a way that the sums of its distances from two fixed points is a constant.

Patents under this class:

Patent Number Title Of Patent Date Issued
7802369 Method for designing structure by drawing curve approximately with circular segment, and structure thereby Sep. 28, 2010
7668337 Ellipsoid detecting method, figure center detecting method, image recognizing device, and controller based on image Feb. 23, 2010
7174645 Method for designing of aproximate elliptical structure and the same Feb. 13, 2007
7025593 Teaching circumference instrument Apr. 11, 2006
6702582 Device and method for solving circles Mar. 9, 2004
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
5470234 Circular, piece-matching math educational aid Nov. 28, 1995
5407356 Pictorial image transforming manipulative-with multiple channel tracks Apr. 18, 1995
5281145 Pictorial image transforming manipulatives Jan. 25, 1994
5215467 Mathematical instruction board and method of use Jun. 1, 1993
5114347 Mathematical function demonstrator boards May. 19, 1992

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