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 |
| 6145151 | Ergonomic brush and handle therefor A brush handle that provides an ergonomic grip to improve the manipulation and reduce the fatigue of the use of the brush. The brush handle provides a series of fitted control surfaces that allow a user to grip the brush handle in a comfortable and precis... | 11/14/2000 |