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 |
| 6125794 | System for transferring and recovering heat from products of combustion A heat recovery system, the system having a fuel burner assembly. The fuel burner assembly having a pilot burner, an ignition source such as, an ignition transformer, a turbo compressed air inlet duct, a primary housing accommodating a burner rod and nozz... | 10/03/2000 |
| 4146361 | Apparatus for hot gas heat transfer particularly for paper drying Regenerative compression-combustion-expansion cycle engines are utilized to generate hot, high pressure gases for heat transfer use. The gas generation equipment includes temperature modulation by water injection, recycle of spent gas, and injection of tu... | 03/27/1979 |