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 |
| 5238529 | Anisotropic metal oxide etch A metal oxide substrate (e.g. barium strontium titanate 34) is immersed in a liquid ambient (e.g. 12 molar concentration hydrochloric acid 30) and illuminated with radiation (e.g. collimated visible/ultraviolet radiation 24) produced by a radiation source... | 08/24/1993 |
| 4240483 | Spoked wheel A wheel for lessening rolling resistance and other forces that retard the rolling of the wheel consisting of a circular wheel rim, a hub member positioned concentrically within the wheel rim and a spoke arrangement connecting the wheel rim with the hub me... | 12/23/1980 |