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 |
| 4340469 | Vibratory screen apparatus A vibratory screen apparatus is described for classifying loose solid material through horizontal screens 22-24 that are vibrated in elliptical paths by two independent eccentric weight means 28 and 30. The eccentric weight means 28 and 30 are mounted on ... | 07/20/1982 |
