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 |
| 4856236 | Roof structure Structure for use on a roof consisting of a plurality of standard elements in the general form of planks that lock together which are formed with a dense outer impermeable skin and a lightweight insulating interior.... | 08/15/1989 |
