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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7090586 | Activity surfaces An apparatus for an a method of closing a fixed gap in an activity surface such as a turfed race-track is described. The apparatus comprises a movable turf tray having an upper surface with the same characteristics as the activity surface and means for guiding the t... | 08/15/2006 |
| 6733397 | Magcanet the magic cane and card to table A magic trick that consist of a magician's cane and playing cards. The magician puts a playing card on top of the cane and puts the cane on top of another card on the floor. The cane is balanced and is now able to act as a table which will support the magicians toph... | 05/11/2004 |
| 6036603 | Whirlpool simulation effect In an apparatus and method for creating a wave or water vortex effect, a bridge or platform is positioned within a semi-cylinder having a downward facing curved inside surface. Nozzles shoot water onto the curved surface, creating a water layer which foll... | 03/14/2000 |
| 5468190 | Multi-purpose arena A multipurpose arena has a platform providing a performing, playing or exhibition area which can be raised or lowered to allow for different configurations of banked seating. The raising and lowering is achieved by displacement of air in or out of an air ... | 11/21/1995 |
| 5114140 | Explosion simulator An underwater explosion effect simulator includes a submerged shooter for shooting props and dye-colored water through the water surface. A compressed air source is linked to the shooter to drive the charge of water from the shooter during the explosion s... | 05/19/1992 |
