William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 7425730 | Organic electro-luminescent display and fabrication method thereof In an organic electro-luminescent display, a pixel circuit is disposed in a unit pixel region defined on a substrate. A passivation layer covers the entire unit pixel region including the pixel circuit. An organic light emitting diode (“OLED”) including a transp... | 09/16/2008 |
| 7291864 | Single or multi-color high efficiency light emitting diode (LED) by growth over a patterned substrate A single or multi-color light emitting diode (LED) with high extraction efficiency is comprised of a substrate, a buffer layer formed on the substrate, one or more patterned layers deposited on top of the buffer layer, and one or more active layers formed on or betw... | 11/06/2007 |
| 7148516 | Color-tunable light emitter The color-tunable light emitter has a first electrode and a light-generating layer adjacent the first electrode. The light-generating layer is operable to generate light in a band of wavelengths. The color-tunable light emitter also includes an electro-optical layer... | 12/12/2006 |
| 7144748 | Electronic assembly/system with reduced cost, mass, and volume and increased efficiency and power density An LED display assembly, comprising a grid of electrical conductors; light emitting diodes in association with the grid and in electrical communication with the conductors that provide power for LED operation, the grid operable to receive heat from the diodes during... | 12/05/2006 |
| 7105858 | Electronic assembly/system with reduced cost, mass, and volume and increased efficiency and power density An LED display assembly, comprising a grid of electrical conductors; light emitting diodes in association with the grid and in electrical communication with the conductors that provide power for LED operation, the grid operable to receive heat from the diodes during... | 09/12/2006 |