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 |
| 6062783 | Expanding bush and captive bolt assembly An expanding bush and captive bolt assembly (1), comprising a bolt (2), a generally cylindrical bush (4), and a ring clip (6) that retains the bush on the bolt. The bush (2) has an inner surface with a portion (22) that has a frustoconical taper, a channe... | 05/16/2000 |