Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 5250965 | Eyeball microscope having parallel slits moving across the optical path An eyeball microscope used for observing or photographing epitherial and endothelial cells and likes of a cornea, which is provided with an illuminating optical system for projecting an illuminating light beam onto an object, an observing optical system f... | 10/05/1993 |
| 5177512 | Eyeball microscope An eyeball microscope used for observing or photographing epithelial and endothelial cells and likes of a cornea, which is provided with an illuminating optical system for projecting an illuminating light beam onto an object, an observing optical system f... | 01/05/1993 |
| 5070883 | Eye movement analyzing device utilizing pupil center-of-gravity data A goggle type eye movement analyzing device which can be mounted on examinee's head incorporating a pair of eyepieces positioned in front of the eyes. Each eyepiece includes a light source, a target, and a TV camera which receives light reflected from the... | 12/10/1991 |
| 5002385 | Target device used in eye movement tests A target device used in an eye movement testing device made up of a light group and a refractor. The light group includes a plurality of light sources lined-up side by side behind an window which opens in the front wall of the casing of the testing device... | 03/26/1991 |
| 4993825 | Device for photographing eye movement A device for photographing eye movement including a target comprising a plurality of lights arranged in a cross-shape with the center thereof being positioned on the eye axis of an examinee, a TV camera positioned behind the target so that at least a prin... | 02/19/1991 |
| 4451855 | Relation density calculation system A relative density calculation system, principally and preferably used with a color scanner, for detecting a surrounding frame of a photographic transparency to be scanned to produce signal information for application to the color scanner to be utilized i... | 05/29/1984 |
| 4440491 | Photographic transparency supporting device A device, which is especially useful in color scanning equipment and the like, for supporting a photograhic transparency on a scanning cylinder, in which the cylinder surface is provided with a window and a layer of magnetic rubber surrounding the window,... | 04/03/1984 |
| 4370033 | Eyeball examining device An eye examining device having a television pickup camera, an optical system for magnifying the eye ground or retina and focussing the image on said camera, a television monitor connected to the camera to display the image of the retina and an optical pat... | 01/25/1983 |
| 4367018 | Eyeball microscope An eyeball microscope used for observing cornea endothelcells and the like, having an objective lens structure including an optical tip member which is formed of a material with lower refractive index than glass in order to avoid the undesired effect of r... | 01/04/1983 |
| 4256384 | Eyeball examining device An eye examining device having a television camera and monitor connected thereto, an optical system for magnifying the eye ground or retina and focussing the image on the camera, a cathode ray tube connected with the camera and scanned in synchronism ther... | 03/17/1981 |
