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 |
| 7156565 | Driver for opening and closing dual-blade shutter adapted to be reset without re-opening shutter In a camera, a dual-blade shutter has a pair of shutter blades supported for opening and closing movement to uncover and re-cover an exposure aperture, and a shutter driver that projects into respective overlapping slots in the shutter blades and is supported for sh... | 01/02/2007 |
| 6682232 | Camera mechanism has substitute actuator to functionally replace failed primary actuator A camera mechanism comprises a shutter blade movable to uncover and cover an exposure aperture; a primary spring connected to the shutter blade to normally move the shutter blade to cover the exposure aperture, but susceptible of becoming disconnected fro... | 01/27/2004 |
| 6580878 | Simplified shutter release assembly and camera having same The invention relates to a shutter release apparatus for use in a camera for capturing images on a perforated film. The shutter release apparatus has a rotatable thumb wheel movable along an axis between a start position and a trigger position. A sprocket... | 06/17/2003 |
| 6485200 | Double-shielding type focal-plane shutter A double-shielding type focal-plane shutter has a closing blade and an opening blade for closing and opening a shutter opening to perform an exposure operation. A closing lever and an opening lever drive the closing blade and the opening blade, respective... | 11/26/2002 |