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 |
| 5396711 | Method of and apparatus for measuring tooth thickness of gear A method of measuring tooth thickness in which the tooth thickness of gear is determined by bringing a pair of measuring legs having an opposing measuring part of ridge line shape close to each other in the direction perpendicular to the axis of gear bein... | 03/14/1995 |
| 5343626 | Method for measuring gears and system for machining and measuring gears A gauge head is attached to the grindstone holder of an NC gear grinding machine, and the tooth profile, tooth trace, gear pitch, etc. of a ground gear are measured on the NC gear grinding machine by actuating the control functions of various parts provid... | 09/06/1994 |
| 5133134 | Apparatus and method for on site testing of involute axle gear parameters The apparatus for measuring the parameters of an axle gear includes an attachment mechanism for providing a surface parallel to the gear axis and positioned at a distance equal to the base circle radius from the gear axis. A displacement measuring device ... | 07/28/1992 |
| 5083458 | Method and apparatus for recording loaded running tooth contact patterns on large reduction gears Method for recording loaded running tooth contact patterns on navy or marine large reduction gears comprising the steps of providing a pair of meshing gears having transversely spaced teeth with surfaces subject to wear, coating the surfaces of as least o... | 01/28/1992 |
| 4962590 | Apparatus and method for testing parameters of involute gears and pinions Apparatus for measuring departures from specified parameters for involute type gears and pinions is described. Wheels having a radius of the gear base circle are coupled to the axis of the gears. The base circle radius wheels travel along parallel tracks ... | 10/16/1990 |
| 4769917 | Method and apparatus for orienting a feeler of a gear testing apparatus A method for orienting a feeler of an apparatus for testing gear flank profiles and flank lines of gear wheels is disclosed, in which the feeler is successively inserted, in two adjacent positions, into an accurately made gap element located on the gear w... | 09/13/1988 |
| 4274207 | Differential checking head A differential checking head for checking tooth-to-tooth spacing of evenly spaced toothed gears or for checking lead variations of helical gears is disclosed. The checking head includes a pair of sensing fingers which have contact portions that touch gear... | 06/23/1981 |
| 3979834 | Device for measuring the pitch diameter of gears A device for use in measuring the pitch diameter of gears has first and second pin-holding units movable along a straight, inclined pathway with means to lock one unit thereto against movement in a predetermined position relative to a gauge. Each pin exte... | 09/14/1976 |