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Class Information
Number: 315/98
Name: Electric lamp and discharge devices: systems > With cathode or cathode heater supply circuit > Plural cathodes or heaters in the load device
Description: Systems, wherein the load device in the system is provided with a plurality of thermionic cathodes or cathode heaters.

Sub-classes under this class:

Class Number Class Name Patents
315/99 Series connected cathodes or heaters 38

Patents under this class:

Patent Number Title Of Patent Date Issued
8456407 Display controlling system utilizing non-identical transfer pulse signals to control display and controlling method thereof Jun. 4, 2013
8324813 Electronic ballast with frequency independent filament voltage control Dec. 4, 2012
8278829 Method and apparatus for reducing radiation from a light fixture Oct. 2, 2012
8072148 Fluorescent lamp driving device and liquid crystal display apparatus using the same Dec. 6, 2011
7808183 Arrangement for the regulation of the electron beam power of an electron gun Oct. 5, 2010
6933676 Driver circuit for a vacuum fluorescence display Aug. 23, 2005
6828717 Electron gun having short length and cathode-ray tube apparatus using such electron gun Dec. 7, 2004
6731073 Safety starter for fluorescent lamps May. 4, 2004
6707264 Sequential burst mode activation circuit Mar. 16, 2004
6472876 Sensing and balancing currents in a ballast dimming circuit Oct. 29, 2002
6359387 Gas-discharge lamp type recognition based on built-in lamp electrical properties Mar. 19, 2002
6316888 Ballast for at least one gas discharge lamp and method for operating such a ballast Nov. 13, 2001
6008586 Direct current ballastless modulation of gas discharge lamps Dec. 28, 1999
5786903 Multi-power control system for scanners Jul. 28, 1998
5627434 Apparatus for operating a fluorescent lamp of an image forming apparatus May. 6, 1997
5448136 Method and apparatus for current regulation in a gas discharge lamp Sep. 5, 1995
5436527 Circuit for operating a fluorescent lamp Jul. 25, 1995
5432406 Wide range load current regulation in saturable reactor ballast Jul. 11, 1995
5319281 Fluorescent tube heating and starting circuit Jun. 7, 1994
5298836 Power supply circuit for gas discharge lamps operating at a resonant frequency Mar. 29, 1994
5243258 Fluorescent lamp electrode disconnect arrangement Sep. 7, 1993
5208511 Fluorescent lamp electrode disconnect arrangement May. 4, 1993
5175470 Fluorescent lamp electrode disconnect arrangement Dec. 29, 1992
5057745 Low-pressure discharge lamp driving circuit Oct. 15, 1991
5027034 Alternating cathode florescent lamp dimmer Jun. 25, 1991
4947086 System for lighting fluorescent lamps Aug. 7, 1990
4937497 On-vehicle brake lamp apparatus Jun. 26, 1990
4920299 Push-pull fluorescent dimming circuit Apr. 24, 1990
4912371 Power saving fluorescent lamp substitute Mar. 27, 1990
4734616 Fluoresent lamp with double cathode and probe Mar. 29, 1988
4695768 Bimetal switch for electrode heat cutout within an electrically insulating support Sep. 22, 1987
4675573 Method and apparatus for quickly heating a vacuum tube cathode Jun. 23, 1987
4663566 Fluorescent tube ignitor May. 5, 1987
4651058 Apparatus and method of operation for an electron beam source Mar. 17, 1987
4473777 Electron emitter assembly Sep. 25, 1984
4454453 Power source device for ion sources Jun. 12, 1984
4414492 Electronic ballast system Nov. 8, 1983
4329622 Low pressure gas discharge lamp with increased end illumination May. 11, 1982
4277726 Solid-state ballast for rapid-start type fluorescent lamps Jul. 7, 1981
4237403 Power supply for fluorescent lamp Dec. 2, 1980
4215292 Apparatus for operating a gaseous discharge lamp Jul. 29, 1980
4122375 Circuit arrangement for increasing the luminous flux in fluorescent tube hand lamps Oct. 24, 1978
4122374 Circuit arrangement for increasing the luminuous flux in fluorescent tube hand lamps Oct. 24, 1978
4080549 Plasma reflex discharge device Mar. 21, 1978
4071807 Fluorescent lamp lighting device Jan. 31, 1978
4051407 Arrangement including a gas and/or vapor discharge lamp Sep. 27, 1977
4010399 Switching circuit for a fluorescent lamp with heated filaments Mar. 1, 1977
3971967 Fluorescent lamp installation having separate filament transformers and remotely located ballast Jul. 27, 1976
3935502 Ballast circuit for eliminating flicker in gaseous discharge lamps Jan. 27, 1976

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