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 |
| 8066428 | Stop watch including a time indicator A stop watch (1) includes a time indicator comprising a hand (2), a first scale (31) and a second scale (41). A first part of a time indication is shown by the hand (2) on the first scale (31) and a second part of said time ... | 11/29/2011 |
| 7014356 | Chronograph A chronograph has a clock movement for driving a second chronograph hand and a minute chronograph hand and a control apparatus for stopping the second chronograph hand and the minute chronograph hand and for setting in motion a rattrapante mechanism of a second ratt... | 03/21/2006 |
| 5122995 | Chronographic fly-back timepiece having a stop-start control for the fly-back hand A fly-back chronograph provided with a stop-start control for the fly-back hand is provided. The control does not require careful and frequent adjustment and avoids premature wear of the fly-back wheel parts. The control device has fly-back pincer, a fly-... | 06/16/1992 |
| 4537514 | Multi-function analog display stopwatch An electronic analog timepiece provides for elapsed and intermediate split time measurement with hands indicating fractions of a second, seconds and minutes. Hands do not move except by a user stop or split command. Then the hands rapidly move to position... | 08/27/1985 |
| 4396296 | Stop watch A stop watch (FIG. 2) for use by runners. A strap is provided and the strap bars 56,57 are disposed at a high level while the back 61 of the watch case is concave or dished. Push-buttons or control pins 17, 18, and 19, for starting, stopping, and resettin... | 08/02/1983 |
| 4364669 | Chronographic watch The watch, as exemplified by FIG. 6, comprises a motor 9 which drives the hands of a timepiece mechanism and a motor 15 which advances those of a chronographic mechanism. When the timepiece mechanism is in operation, a counter 98 receives every six second... | 12/21/1982 |
| 4270197 | Analog display electronic stopwatch An analog display electronic stopwatch including at least one first hand driven during elapsed time measurement and a secondary hand driven after completion of elapsed time measurement is provided. The first hand indicates an arbitrary unit of elapsed tim... | 05/26/1981 |
| 4223526 | Electronic timepiece An electronic timepiece comprises an oscillator, a frequency divider for frequency dividing the output signal of the oscillator to generate 100 Hz output pulse signals, time count circuits having a plurality of counters cascade-connected to count the outp... | 09/23/1980 |