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 |
| 6770063 | Thoracic vent kit A thoracic vent kit has a reservoir and an introducing port and a catheter port. A removable cannula is small enough to fit in the catheter, but has an internal diameter that can accommodate a flexible guide wire. The cannula has a beveled tip and a luer threaded ca... | 08/03/2004 |