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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 7429863 | Method and apparatus for maintaining emission capabilities of hot cathodes in harsh environments A method and apparatus for operating a multi-hot-cathode ionization gauge is provided to increase the operational lifetime of the ionization gauge in gaseous process environments. In example embodiments, the life of a spare cathode is extended by heating the spare c... | 09/30/2008 |
| 7193368 | Parallel lamps with instant program start electronic ballast In a current fed electronic ballast multiple lamps are operated in a parallel circuit arrangement. The ballast provides pre-heating to the cathodes of the lamps for a period of time before an open circuit voltage is ramped up to the preferred starting voltage of the... | 03/20/2007 |
| 7084590 | Booster and motor controller A voltage sensor (101) is connected to output terminals (P, N) of a booster. The voltage sensor (101) detects a boosted voltage, and outputs the detected voltage to a first drive controller (102). The first drive controller (102) outputs ... | 08/01/2006 |
| 6008586 | Direct current ballastless modulation of gas discharge lamps The present invention relates to an apparatus and method for receiving a modulating signal, splitting up its various frequency components into separate channels using a plurality of filters, and applying the outputs of the filters to gas discharge lamp mo... | 12/28/1999 |
| 5483127 | Variable arc electronic ballast with continuous cathode heating A fluorescent lighting control system providing automatic and/or manual adjustability of the arc current(s) in one or more fluorescent lamps to permit operation of the lamps at less than rated wattage, and its concomitant luminous flux, in interior buildi... | 01/09/1996 |
| 5063328 | Energy saving circuit for discharge tubes Circuits for increasing the efficiency of fluorescent tubes by openings one side of all of the filament circuits of the tubes in response to flow of plasma current. The circuits may be employed in conjunction with the circuits of Lucetta U.S. Pat. No. 3,9... | 11/05/1991 |
| 4503362 | Frequency stabilized, gain controlled ballast system A frequency stabilized automatic gain controlled ballast system (10) which is coupled to a power source (12) in order to operate at least one of a pair of gas discharge tubes (40 and 40'). Each of the gas discharge tubes (40, 40') include respective filam... | 03/05/1985 |
| 4107581 | Fluorescent lamp insert with conductive rod support A non-light emitting insert for a fluorescent lighting fixture is used in place of a fluorescent lamp to complete a plural lamp ballast circuit so that the ballast is effective to illuminate properly any remaining fluorescent lamp coupled therein. The ins... | 08/15/1978 |
| 4092562 | Fluorescent lamp unit for multiple installation A compact integral permanently assembled lamp unit comprising a fluorescent lamp, resistor ballast, starter means, and end connectors for connecting a plurality of lamps together.... | 05/30/1978 |
| 4053811 | Fluorescent lamp simulator A non-light emitting insert for a fluorescent lighting fixture is used in place of a fluorescent lamp to complete a plural lamp ballast circuit so that the ballast is effective to illuminate properly any remaining fluorescent lamp coupled therein. The ins... | 10/11/1977 |
| 3956665 | Device for replacing a fluorescent lamp in a serially connected fluorescent lamp system A device for replacing a fluorescent lamp in a two lamp serially connected fluorescent fixture either of the type which includes a rapid-start type transformer for every two rapid-start fluorescent lamps or an instant start fixture for every two instant s... | 05/11/1976 |
