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 |
| 6565715 | Land-based desalination using buoyant hydrate Methods and apparatus for desalination of salt water (and purification of polluted water) are disclosed. Salt water is pumped to a desalination installation and down to the base of a desalination fractionation column, where it is mixed with hydrate-formin... | 05/20/2003 |
| 6531034 | Land-based desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate Methods and apparatus for desalination of salt water (and purification of polluted water) are disclosed. Salt (or otherwise polluted) water is pumped to a desalination installation and down to the base of a desalination fractionation column, where it is m... | 03/11/2003 |
| 6475460 | Desalination and concomitant carbon dioxide capture yielding liquid carbon dioxide Methods and apparatus for desalination of salt water (and purification of polluted water) are disclosed. Saline (or otherwise polluted) water is pumped to a desalination installation and down to the base of a desalination fractionation column, where it is... | 11/05/2002 |