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 |
| 6611076 | Tooth tip for a high speed generator Tooth tips, which fit over teeth and distal ends of fingers formed between slots in laminated disks making up a portion of a stator in a generator, facilitate slipping stator windings into the slots from a central opening in the laminated disks; cooperate... | 08/26/2003 |