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 |
| 7144591 | Composition containing citronella java oil and use thereof for repelling insects The present invention concerns a composition comprising a specific ethereal oil, which may be used as insect repellent. ... | 12/05/2006 |