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 |
| 6184776 | Accelerator module for electric vehicle An accelerator module for an electric vehicle has a pivotal actuator upon which is mounted a wiping element for wiping engagement with variable and constant resistance elements formed upon a printed circuit board mounted within a housing. A normally-open ... | 02/06/2001 |
| 5699037 | Variable resistor having clutch mechanism A variable resistor comprises a slider body, a contact arm which is provided to project from the slider body, a contact part which is formed by bending the contact arm, an arcuate spring arm having a projection for engaging with an engaging portion of a r... | 12/16/1997 |
| 5187464 | Extended life potentiometric position transducer A potentiometric position transducer comprises a resistive track movably mounted within a housing. A portion of the resistive track is between two fixed electrical contact points. A third electrical contact is moveable over such portion, corresponding to ... | 02/16/1993 |
| 5095299 | Potentiometer In a potentiometer applied to the EGR system in automobiles, a relative motion between a printed circuit card and a holder, through which the card is slidably inserted, is blocked to prevent unwanted wear of a resistor on the printed circuit card when the... | 03/10/1992 |
| 4792780 | Sliding operation type electric part A sliding operation type electric part comprising a first slider holder, to the upper surface of which a slider is secured by burying a part thereof so that it extends on the surface thereof, and a second slider holder, to the lower surface of which a sli... | 12/20/1988 |
| 4665376 | Vibration resistant linear potentiometer Linear potentiometers are commonly used as position sensors on various mechanical devices. Such potentiometers are frequently subjected to extreme vibratory excitation, which is known to cause premature failure. The subject potentiometer includes a housin... | 05/12/1987 |
| 3932831 | Variable resistance device A variable resistor including a resistance element, a housing supporting the element, and rotary means including a shaft located within the housing. Means are provided to restrain rotational movement of the rotary means except upon application of a relati... | 01/13/1976 |