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 |
| 6608229 | Oxidation of polysaccharides with nitroxyls A simplified process for oxidizing starch and other polysaccharides in an aqueous solution or suspension using hypochlorite in the presence of a catalytic amount of a nitroxyl compound is described. The oxidation is process is bromide-free and is carried ... | 08/19/2003 |