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 |
| 7282864 | Discharge lamp and control of the same A discharge tube is driven by a multiple-phase drive circuit, and includes a discharge container having an internal discharge space and multiple electrodes that are secured to the discharge container and correspond to each phase of the multiple-phase drive circuit. ... | 10/16/2007 |
| 5998938 | Circuit arrangement with a piezoelectric transformer The invention relates to a circuit arrangement with a piezoelectric transformer having two electrodes arranged on the primary side of the transformer and such a piezoelectric transformer itself. Piezoelectric transformers of this type are used, for exampl... | 12/07/1999 |
| 5177407 | Glow discharge lamp having dual anodes and circuit for operating same An AC operated glow lamp having a cathode electrode and a pair of anode electrodes driven from a capacitively ballasted autotransformer that provides phase inversion so as to enable a full wave rectification of the discharge current thus operating in a DC... | 01/05/1993 |
| 4704561 | Push-pull generator A push-pull generator with a driver stage and a push-pull output stage. A parallel connection of a resistor (R3, R4) with a control transistor (T3, T4) is provided in the base line of each output stage transistor. In the push-pull output stage, resistors ... | 11/03/1987 |
| 4647817 | Discharge lamp starting circuit particularly for compact fluorescent lamps To provide for reliable ignition of low-pressure discharge lamps, particularly compact fluorescent lamps, operated at high frequency, for example in the order of about 45 kHz, an ignition circuit is connected in parallel to the lamp and serially with the ... | 03/03/1987 |
| 4614897 | Switching circuit An electronic switch is disclosed that uses two complementary regenerative latches connected in a push-pull arrangement. The latches are interconnected so that when either latch turns on, the other latch is forced to turn off. In this arrangement, the inh... | 09/30/1986 |