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 |
| 5415150 | Apparatus for projecting a ball A machine (10) for projecting a ball, such as a volleyball (B), includes a longitudinally extending, pivotally mounted impact arm (27). A power spring (32) is attached to one end of the arm (27). A ramp (41) is provided on the arm (27) and is mounted angu... | 05/16/1995 |