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 |
| 6497252 | Miniaturized fluid flow switch The invention relates to a miniaturized fluid flow switch which enables a directed deflection or deviation of a fluidic test current injected into a fluidic carrier current. The aim of the invention it to provide a fluid flow switch which does not require... | 12/24/2002 |
| 4562867 | Fluid oscillator There is disclosed a fluidic oscillator in which a stream of fluid is directed against a barrier member in an oscillation chamber. The barrier member serves as one wall of the oscillation chamber and in conjunction with other shaped wall surfaces of the o... | 01/07/1986 |
| 4447251 | Sonic levitation apparatus A sonic levitation apparatus (A) is disclosed which includes a sonic transducer (14) which generates acoustical energy responsive to the level of an electrical amplifier (16). A duct (B) communicates with an acoustical chamber (18) to deliver an oscillato... | 05/08/1984 |
| 4190083 | Fluidic logical pyrotechnic initiator A fluidic pyrotechnic initiator capable of initiating a fluid resonator cridge initiator upon receipt of a low pressure input signal. A monostable supersonic wall-attachment fluidic amplifier is used with a control channel to detach the supersonic jet, c... | 02/26/1980 |
| 4181153 | Fluidic-amplifier device having tube in outlet channel The present invention involves the insertion and use of a tube in one of the outlet channels of a pure fluid bistable amplifier. The amplifier will function so long as the cross-sectional area of the tube is less than twenty percent (20%) of the cross-sec... | 01/01/1980 |