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 |
| 5619204 | Analog-to-digital converter with optional low-power mode An IC chip having an analog-to-digital converter together with control circuitry for effecting switchover between normal-power mode and low-power mode. The control circuitry includes a first D-type flip-flop with reset which receives on its "D" input a co... | 04/08/1997 |