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 |
| 6202564 | Double end derail A bi-directional derail is provided with an improved construction which reduces the thrust load imparted by a rail vehicle wheel against the derail, while maintaining the weight and material cost of the derail within practical limits. In a preferred embod... | 03/20/2001 |
| 4493265 | Electric rerailer for a model railway An electric rerailer provided with guide ways for guiding a motor-driven vehicle of a model railway onto a pair of rails, in which the surfaces of the guide ways are formed by electric conductors electrically isolated from each other and used respectively... | 01/15/1985 |
