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| Number | Title | Issue Date |
| 7318764 | 3-dimensional assembly A 3-dimensional assembly is constructed from three 2-dimensional pieces. Each piece is formed with two slots such that the pieces are operatively identical and are interchangeable, and such that the pieces may be formed into a structure without bending of the pieces... | 01/15/2008 |
| 7174645 | Method for designing of aproximate elliptical structure and the same A method for designing an elliptical structure with an outline of an approximate elliptic curve, which is generated by connecting circular segments to one another, and an elliptical structure created on said method. A first fixed point is established outside the ell... | 02/13/2007 |
| 7025593 | Teaching circumference instrument A device that teaches the relationship between a circle, its diameter and its radius. The device includes a circular ring that has a rigid intersecting bar representing its diameter. Attachment mechanism allows flexible diameter bars to be attached around the outer ... | 04/11/2006 |
| 6702582 | Device and method for solving circles A combination of devices that demonstrate visually and on an intuitive level mathematical principles relating to the circle including the number π, the relationship between circumference, diameter, radius and π, and the relationship between the area of ... | 03/09/2004 |
| 6213779 | Conic section activity boards The present invention provides a variety of laminated plastic activity boards that allow the individual to visualize and have interactive exploration of conic sections and their definitions. This allows for more class time to be spent investigating the co... | 04/10/2001 |
| 6132217 | Method and apparatus for teaching relationship of trigonometric functions between unit circle and rectangular coordinate system A method and apparatus for teaching a relationship of trigonometric functions between a unit circle and a rectangular coordinate system has a primary flexible member movable between a circular configuration defining the unit circle, and a straight configu... | 10/17/2000 |
| 5470234 | Circular, piece-matching math educational aid 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... | 11/28/1995 |
| 5407356 | Pictorial image transforming manipulative-with multiple channel tracks A visual aid teaching device for translating one or more superimposed picture images in a linear path at different positions with respect to a stationary underlay picture includes as basic components: a pair of edge strip members, each embodying two or mo... | 04/18/1995 |
| 5281145 | Pictorial image transforming manipulatives The pictorial image transforming manipulatives are instructional visual aid devices adapted for use to demonstrate visually the applications of deductive reasoning in proving most of the geometry theorems in conjunction with a geometry course. The manipul... | 01/25/1994 |
| 5215467 | Mathematical instruction board and method of use An educational board for use in demonstrating mathematical principles has a surface marked with a circle having its circumference marked with gradations indicating 360 degrees. The board is provided with pins to mark any angular displacement along the cir... | 06/01/1993 |
| 5114347 | Mathematical function demonstrator boards An electromechanical demonstrator board of one or more of the six trigonometric functions. The board is powered electrically by a battery and mechanically by a hand crank which drives a pointer and contact arm. The circuits include light emitting diodes (... | 05/19/1992 |
