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A sealed crustless sandwich for providing a convenient sandwich without an outer crust which can be stored for long periods of time without a central filling from leaking outwardly.
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| Number | Title | Issue Date |
| 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 |
| 6065968 | Toy for forming variable three-dimensional design A toy that may be used to make three-dimensional designs from elastic members comprises a base and at least one, and preferably two, vertical sidewalls rotatable relative to the base. The base and the at least one sidewall each have a face surface with a ... | 05/23/2000 |
| 6024574 | Visual aids for understanding characteristics of geometric figures A geometric figure teaching aid includes a base, a rod affixed to and extending from the base, and a series of side members interconnected with the base and the rod. The base is preferably formed of a translucent material, and the rod is mounted to the ba... | 02/15/2000 |
| 5639090 | Geoboard with movable pins A geoboard has a board member with a plurality, advantageously four edges. An array of holes which is preferably in the form of a matrix, is provided in the board member for receiving slidably mounted push-up pins. Each push-up pin has upper and lower pos... | 06/17/1997 |
| 5328374 | Geometry board A geometry board having pegs arranged on its top face for the demonstration of planar geometric figures by stretching of elastic bands about the pegs. The disclosed board is of clear injection-molded plastic and has a square face with the pegs arranged in... | 07/12/1994 |
| 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 |
| 4371344 | Tension model device A tension model device is disclosed which has: Three struts which cross each other at or near the center portion of each strut; and a plurality of corresponding tension strands. The strands are joined from each end of all the struts to each end of the oth... | 02/01/1983 |
