Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7907267 | Optical method and system for generating calibration data for use in calibrating a part inspection system An optical method and system for generating calibration data are provided. The calibration data is for use in calibrating a part inspection system. The method includes supporting a calibration device having a central axis and a plurality of regions which are rotatio... | 03/15/2011 |
| 7738088 | Optical method and system for generating calibration data for use in calibrating a part inspection system An optical method and system for generating calibration data are provided. The calibration data is for use in calibrating a part inspection system. The method includes supporting a calibration device having a central axis and a plurality of regions which are rotatio... | 06/15/2010 |
| 6842711 | Power calibration system The present invention provides a high precision, low cost laser power calibration system. First, the photo signals output from a standard photo diode are received by a photo calibration system; then a set of standards consisting of the corresponding current signals ... | 01/11/2005 |
| 5684596 | Method and apparatus for measuring axial and torsional loads on a valve stem An optical system for determining the axial load, the torsional load or both on a generally cylindrical member, such as a valve stem in a motor operated valve, includes a first system for producing a test light that is modified by a physical change in the... | 11/04/1997 |
| 5610709 | Automatic ranging optical power monitoring system A high speed, automatic calibration system of laser (or other light source) sensitometers capable of a wide range of power measurements, of densitometers and of other optical power measuring systems, and particularly to an automatic gain scaling circuit f... | 03/11/1997 |
| 4644341 | Contrast indicating arrangement in photoelectric sensing systems A photoelectric sensing system, the adjustment of which is facilitated by the incorporation therein of a contrast indicator with a display in the form of an array of light emitting diodes (LEDs) controlled by a driver circuit which is arranged for success... | 02/17/1987 |
| 4488812 | Photometric apparatus A photometric analyzer and method are disclosed for analyzing particle containing samples. More particularly, a nephelometric apparatus and method are disclosed for analyzing baceteria samples. In the disclosed embodiment, the bacteria count of a bacteria... | 12/18/1984 |
| 4405199 | Method for enhancing signals transmitted over optical fibers A method for spectral equalization of high frequency spectrally broadband signals transmitted through an optical fiber. The broadband signal input is first dispersed by a grating. Narrow spectral components are collected into an array of equalizing fibers... | 09/20/1983 |
| 3990799 | Digital exposure meter In an exposure meter having a row of lighting elements, such as lamps or light-emitting diodes, which correspond to respective exposure values, an improvement is made in that by utilizing a capacitor-charging integrating circuit, a constant current circui... | 11/09/1976 |
