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 |
| 4073969 | Method of fabricating a photoconductive detector of increased responsivity A method of fabricating a photoconductive detector of increased responsivity, such as an infrared detector, from a slab of N-type, intrinsic bulk semiconductor material comprises shielding part of the detector active area between the positive and negative... | 02/14/1978 |
| 3963925 | Photoconductive detector and method of fabrication An improved IR detector and method of fabrication is disclosed. The improved IR detector comprises at least one detector element having a slab of bulk intrinsic semiconductor material, a pair of spaced electrodes formed on said slab, the space between the... | 06/15/1976 |