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 |
| 6757574 | Methods and apparatus for producing animal sounds to lure animals Method and apparatus for luring a member of an animal species to an area in an environment. In one aspect, a pre-recorded sound that simulates an environmental contact sound made by the animal species in the environment is played back to lure the member of the anima... | 06/29/2004 |