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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 |
| 6041186 | Finder system A finder system including a first optical system and a second optical system apart from the first optical system by a certain base length. Based on an object distance obtained with use of an active or passive distance measuring device, degree of coinciden... | 03/21/2000 |
| 5856663 | Focus detecting apparatus with virtual centering of line sensor A focus detecting apparatus includes a focus detecting device which forms an image through a telephotographic system, onto a line sensor, and which detects a focus state of the telephotographic system based on an output from a predetermined portion of the... | 01/05/1999 |
| 5856664 | Automatic focusing apparatus for detecting and correcting focus state of image optical system An automatic focusing apparatus including a focus detecting device which detects a defocus amount of image optical system, a focusing device which focalizes based on the defocus amount calculated by the focus detecting device. An adjustment device which a... | 01/05/1999 |
| 5835473 | Optical pick-up, optical data recording apparatus and objective lens for optical data recording material An optical pick-up for reading data in the data recording surface of an optical data recording material by collecting light from a light source by means of an objective lens, and shining reflection light from the data recording surface onto a light receiv... | 11/10/1998 |
