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 |
| 7153260 | Laryngoscope for simultaneously facilitating the illuminating of a throat pathway and inserting an intubation tube An improved laryngoscope of the type having a stationary handle, a stationary blade affixed to the stationary handle, a tip pivotally attached to the stationary blade, a movable handle pivotally attached to the stationary blade, and an arm pivoting the tip downwardl... | 12/26/2006 |