Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 5997403 | Spinning playground equipment A spinning play device for children is disclosed. The spinning play device includes a rotating mechanism mounted to a frame a predetermined distance above a supporting surface and a handhold depending from the rotating mechanism to allow a user to grip th... | 12/07/1999 |
| 5860663 | Land transportation device A land transportation device for compact, sandy and open land, with or without a slope, based on the intersection of two reinforced and identical truncated rings in orthogonal planes with respect to each other. The geometric centers shifted of the rings a... | 01/19/1999 |
| 4978120 | Recreational device having rings The occupant propelled recreational or amusement device and playground toy includes an elongated central support having a bearing device or rotatable hub affixed at its upper end. The hub defines a rotational axis which is inclined with respect both to a ... | 12/18/1990 |
