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 |
| 5095305 | Large display apparatus using discharge lamps and discharge lamp load circuit for the large display apparatus A high frequency power source is coupled with a capacitor of a large capacitance. An electric power of the power source is supplied to a plurality of discharge lamps repsectively through lamp load circuits associated therewith. Each load circuit includes ... | 03/10/1992 |
| 5049781 | Discharge lamp A discharge lamp comprises a cylindrical lamp casing substantially formed of a metallic material, a transparent glass plate air-tightly fitted to one of the opened end of the lamp casing, a sealing stem air-tightly closing the other opened end of the lamp... | 09/17/1991 |
| 4839564 | Large image display apparatus A large image display apparatus comprises a plurality of discharge lamps each having an anode, a cathode and a light emitting tube, a display board having the plurality of discharge lamps thereon, a heating circuit for heating the cathodes of the pluralit... | 06/13/1989 |
| 4635052 | Large size image display apparatus A large number of luminous display elements are arrayed on a board, and the quantity of light emitted by each display element is controlled in accordance with a video signal generated by a video signal generator. Each display element is constituted by a d... | 01/06/1987 |
| 4581655 | Video display apparatus In a picture image display apparatus including a large number of display elements which are lighted by digitalized level adjusted light data produced by a video signal, the digitalized level adjusted light data are corrected by the difference between a me... | 04/08/1986 |
| 4392086 | Apparatus for operating a gaseous discharge lamp An apparatus for a gaseous discharge lamp includes a power controlling device for converting an AC voltage into a phase control output, a high frequency generating device for converting the output of the high frequency generating device into an high frequ... | 07/05/1983 |
