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 |
| 7367950 | Distributed apparatus and method for non-invasive measurement of functional state and adaptive response An apparatus and method for distributed, non-invasive assessment of the functional state and state of adaptive response of a subject under test. The functional state tests may include heart rate variability, differential ECG, omega brain wave, jump and stimulus resp... | 05/06/2008 |