Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 6905389 | Toy top game unit A toy top game unit is provided, the unit comprising a toy top, driving means for rotating said toy top, a game board for receiving said toy top thereon, means for interacting the toy top and the game with each other, and for imparting a change to an operational mod... | 06/14/2005 |
| 6739939 | Toy top game unit A toy top game unit is provided, the unit comprising a toy top, driving means for rotating said toy top, a game board for receiving said toy top thereon, means for interacting the toy top and the game with each other, and for imparting a change to an operational mod... | 05/25/2004 |
| 6443801 | Spinning top A spinning top including a hollow body having a vertical spin axis and including an upper and a lower body portion rigidly connected together directly or preferably interconnected by a weighted annular ring for increased rotational inertia. A replaceable ... | 09/03/2002 |
| 6089946 | Top launcher with positive top engagement A spinning top includes a driving device and a series of tops. The driving device includes a motor driving a clutch, and each top has a seat for temporary engagement with the clutch which drives the top to spin. The driving device comprises a control swit... | 07/18/2000 |
| 5941753 | Spinning toplet assembly A toplet assembly of inner, intermediate and outer toplets has releasable catches on respective housings of the outer and intermediate toplets which secure the intermediate and inner toplets to the outer and intermediate toplets, respectively, nested one ... | 08/24/1999 |
| 5683083 | Top game and method of playing same A top game apparatus and the method of playing the same in which one or more players move a target top along a playing field toward a goal by striking the target top with a spinning top thrown from the player's hand toward the target top. The game apparat... | 11/04/1997 |
| 5122089 | Spin top A spin-top which includes a body of substantially rotational symmetry around a longitudinal axis, the body having a curved outer surface for converting force having a vertical component applied thereto into a rotational force, the top being provided with ... | 06/16/1992 |
| 5020798 | Spinning top game kit A game kit organization includes a plurality of spinning tops, the spinning top includes a generally conical lower surface, a medial annular surface, and a convex upper surface for reception of a string to be wound about the convex upper surface to effect... | 06/04/1991 |
| 4867728 | Toy top launcher A toy top launcher simulating a space shuttle is disclosed for launching a rotating top having a circular enlarged end and a gear adjacent the opposite end onto a flat surface. The top launcher has a chamber for supporting the enlarged ends of a plurality... | 09/19/1989 |
| 4828258 | Spinning top game apparatus and method A spinning top game toy includes a disk-shaped playing board with three groups of upstanding pedestals mounted to the periphery of the board and a central pedestal extending upwardly from the board adjacent the center portion thereof. The upper surface of... | 05/09/1989 |
| 4127271 | Combination toy top, projectile toy and bath toy The disclosure is directed to a combination toy top, projectile toy, and bath toy. In accordance with one embodiment of the disclosed toy there is provided a cup-shaped receptacle having a tip protruding from the outer apex thereof and a central stem exte... | 11/28/1978 |
