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 |
| 6283454 | Apparatus for fence repair and construction The present invention is a trailer for the repair and construction of fences used for example, to enclose farmland or livestock on a ranch. The trailer is a fully self-contained fencing apparatus which can be conveyed by various vehicles capable of traver... | 09/04/2001 |
| 6229473 | Arrangements for the one-dimensional or multi-dimensional determination of the position of a load suspension point in hoists The stopping of a load suspended from a crane requires a swing control or, respectively, a swing damping. Upon employment of microwave measuring units, spacings between a carrying cable suspension and a load suspension point are determined on the basis of... | 05/08/2001 |
| 6094166 | Conical omni-directional coverage multibeam antenna with parasitic elements An omni directional coverage multibeam antenna relief on a ground surface having simple conical shapes to provide beam steering is disclosed. One advantage of such a system is that the projected area is always constant and broadside to the intended direct... | 07/25/2000 |
| 4745411 | Digital gain adjustment A cathode ray tube (CRT)/deflection coil assembly is provided which includes a signature resistor for indicating the deflection sensitivity of the deflection coil. An amplifier circuit with an adjustable gain supplies current to the deflection coil. A gai... | 05/17/1988 |