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 |
| 6958583 | AC voltage control circuit The inventive control circuit 40 serves to render the output voltage to be the output value of any one of the outputs OUT1 to OUT5 when both the main power source A of the power saving device 100 and the control circuit's switch B are in ... | 10/25/2005 |
| 6788012 | Circuit for generating high voltage pulse A simple and less expensive high voltage pulse generating circuit including a low voltage direct current voltage source having one output terminal connected to another output terminal via a series circuit of a first switch with a low withstand voltage, an inductance... | 09/07/2004 |
| 5528108 | Field emission device arc-suppressor A field emission device (10) has an anode (18) that is used to attract electrons emitter by an emitter (13). An inductor (19) is coupled in series between the anode (18) and a voltage source (21) in order to prevent arcing between the anode (18) and the e... | 06/18/1996 |
| 5461345 | Frequency synchronous circuit for reducing transition period from power on state to stable state A frequency synchronous circuit has a first selection unit, a first counter unit, a second counter unit, a storage/average unit, and a comparison unit. The first selection unit is used to select one sampling signal from a first sampling signal having a fi... | 10/24/1995 |