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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 7296999 | Educational display mitt for magnetic playing pieces and method A teaching system comprising a set of magnetic playing pieces, a display mitt comprising a first panel being associated with the palm of a user of the mitt; including a flexible metallic layer for attracting at least one magnet, an exterior layer covering the flexib... | 11/20/2007 |
| 7273375 | Teaching aid device and method of teaching A device for instructing mathematics includes a work surface and a plurality of movable elements. Each of the movable elements includes, on a front surface thereof, at least a portion of a visible mathematical symbol (including numeric and nonnumeric symbols) thereo... | 09/25/2007 |
| 6793251 | Binder with magnetically retained pages A binder has a front cover and a back cover. A first page assembly for mounting in the binder includes a first magnet. A second page assembly for mounting in the binder in an overlying relationship with the first page assembly includes a second magnet for releasably... | 09/21/2004 |
| 5949050 | Magnetic cards having a layer being permanently magnetized in a fixed configuration Magnetic cards are formed by plural, coadjoining, generally planar, parallel layers. Outermost layers form outer sides of each card. At least a first visible image is provided on a first of the outer sides. The card includes a generally planar, permanentl... | 09/07/1999 |
| 5933329 | Board for mounting display element A board usually resembling a PCB or a PWB mounts a display element, whose appearance in a viewing direction is controlled by the sense of magnetization of a core which extends through a bore in the board. A conducting coil formed on the surface of said bo... | 08/03/1999 |
| 5820383 | Magnetic manipulatives book A book having at least one fold out page with a metal insert which assists the placement or arrangement of magnetic manipulatives onto a page of the book.... | 10/13/1998 |
| 5809675 | Board for mounting display element A board usually resembling a PCB or a PWB mounts a display element, whose appearance in a viewing direction is controlled by the sense of magnetization of a core which extends through a bore in the board. A conducting coil formed on the surface of said bo... | 09/22/1998 |
| 5707238 | Number and math education system A child educational system comprises a support member having a generally flat rectangular support face having a top edge, a row of numbers disposed in a horizontal row along the top edge, a vertical column disposed below each of the numbers, each column h... | 01/13/1998 |
| 4865324 | Magnetic wheel puzzle A puzzle comprises a plurality of puzzle elements held together along a common axis. Each of the puzzle elements includes first and second faces and a peripheral edge. A series of discrete symbols are formed along the peripheral edge of each element. Pref... | 09/12/1989 |
| 4846689 | Magnetic educational aid and teaching method An educational aid, comprising a figure representing an animate object. A plurality of first enhancing means are provided which are adapted to attach magnetically to the figure. One surface of the first enhancing means bears representation of at least one... | 07/11/1989 |
| 4838793 | Activity display article with removable manipulatives An activity display article is constructed to have multi-educational features especially useful for teaching basic skills to young children. The article comprises at least one activity sheet having visual objects printed thereon. A magnetic strip is mount... | 06/13/1989 |
| 4377384 | Three-dimensional teaching device A three-dimensional device for teaching mathematical problems, comprising a stand having a number of open-ended shelves extending therefrom, the surfaces of said shelves being adapted to removably and interchangeably receive slides carrying different digi... | 03/22/1983 |
| 4366637 | Set of advertising components A kit of components for advertising purposes comprises a coated steel panel, a filling device having a plurality of coated steel sheets, and a plurality of flexible magnetic characters made from rubber or similar synthetic material having incorporated the... | 01/04/1983 |
| 4295832 | Educational toy A novel educational toy is provided which comprises, in combination, an elongated support rod and a plurality of separated magnetic members slideably received on the rod. Each member has a pair of opposed faces, the faces having an opposite polarity to ea... | 10/20/1981 |
