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 |
| 6169128 | Plastic/rubber composition By employing the present invention, a process for manufacturing products from discarded rubber and plastic material is achieved wherein compositions of vulcanized rubber and thermoplastic polymers, particularly those of the olefinic branch, are intermixed... | 01/02/2001 |