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Class Information
Number: 315/94
Name: Electric lamp and discharge devices: systems > With cathode or cathode heater supply circuit
Description: Systems having a load device connected in the system, the load device being a discharge device provided with (1) a thermionic cathode adapted to be heated by electric current other than the discharge current flowing through the cathode, or (2) a cathode of the indirectly heated type, that is, a thermionic cathode which is heated by the heat generated in an electric heater element adjacent the cathode, the system being provided with electric circuit means to apply electric current to the cathode or the cathode heater element.

Sub-classes under this class:

Class Number Class Name Patents
315/107 Automatic cut-out or voltage regulator in the cathode or heater circuit 165
315/102 Delayed application of the discharge potential 40
315/101 Discharge device and/or rectifier in the cathode or heater circuit 140
315/98 Plural cathodes or heaters in the load device 49
315/95 Plural load device systems 13
315/105 Pulsating or a.c. supply to the cathode or heater circuit 196

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8692166 Substrate heating device and substrate heating method Apr. 8, 2014
8664860 Cathode heating device of magnetron, microwave generating device and method of preheating cathode of magnetron Mar. 4, 2014
8593078 Universal dimming ballast platform Nov. 26, 2013
8492978 Dual element switched electron gun Jul. 23, 2013
8476561 Substrate heating device and substrate heating method Jul. 2, 2013
8441211 Electronic ballast capable of self-protection at natural or premature end of life of fluorescent light tube May. 14, 2013
8378579 Ballast circuit for a gas discharge lamp with a control loop to reduce filament heating voltage below a maximum heating level Feb. 19, 2013
8358072 Circuit arrangement, and method for the operation of a fluorescent lamp Jan. 22, 2013
8338808 Ultraviolet radiation lamp and source module and treatment system containing same Dec. 25, 2012
8324813 Electronic ballast with frequency independent filament voltage control Dec. 4, 2012
8319434 OLED illumination device with integrated proximity sensor Nov. 27, 2012
8314557 Light source device, discharge lamp and its control method Nov. 20, 2012
8232727 Ballast circuit for a gas-discharge lamp having a filament drive circuit with monostable control Jul. 31, 2012
8228000 Circuit arrangement for operating a low-pressure gas discharge lamp and corresponding method Jul. 24, 2012
8212489 Circuit arrangement and method for starting and operating one or more discharge lamps Jul. 3, 2012
8203273 Ballast circuit for a gas discharge lamp that reduces a pre-heat voltage to the lamp filaments during lamp ignition Jun. 19, 2012
8188451 Electron generation and delivery system for contamination sensitive emitters May. 29, 2012
8138676 Methods and systems for dimmable fluorescent lighting using multiple frequencies Mar. 20, 2012
8129911 Magnetron Mar. 6, 2012
8004199 Method for powering a control circuit for a gas discharge lamp during pre-heating of said lamp, and a device for performing said method Aug. 23, 2011
7952303 Electronic ballast for a gas discharge lamp with controlled filament heating during dimming May. 31, 2011
7834552 Controlling a lamp ballast Nov. 16, 2010
7808183 Arrangement for the regulation of the electron beam power of an electron gun Oct. 5, 2010
7750570 Glow-switch starter, lighting device and lighting system therewith, and use thereof Jul. 6, 2010
7635953 Insulation detection power supply and electronic ballast Dec. 22, 2009
7629750 Lamp driving device and driving method thereof Dec. 8, 2009
7589472 Electronic ballast with lamp type determination Sep. 15, 2009
7573046 Thermal field emission electron gun with reduced arcing Aug. 11, 2009
7560867 Starter for a gas discharge light source Jul. 14, 2009
7560868 Ballast with filament heating and ignition control Jul. 14, 2009
7429826 Indirectly heated electrode for gas discharge tube, gas discharge tube using said indirectly heated electrode, and lighting device for said gas discharge tube Sep. 30, 2008
7391041 Germicidal UV reactor and UV lamp Jun. 24, 2008
7339322 Apparatus and methods for making spectroscopic measurements of cathode fall in fluorescent lamps Mar. 4, 2008
7279844 Electronic ballast Oct. 9, 2007
7259519 Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Aug. 21, 2007
7256549 Three electrode arc-discharge lamp Aug. 14, 2007
7224124 Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps May. 29, 2007
7196476 Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Mar. 27, 2007
7193367 Indirectly heated electrode for gas discharge tube, gas discharge tube with this, and its operating device Mar. 20, 2007
7187132 Ballast with filament heating control circuit Mar. 6, 2007
7063431 Resistive bubble lamp structure Jun. 20, 2006
7061173 Amalgam-doped low mercury low-pressure UV irradiator Jun. 13, 2006
7002301 Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Feb. 21, 2006
6969952 System and method for automatically routing power for an integrated circuit Nov. 29, 2005
6894439 Portable power converter pack May. 17, 2005
6806649 Starter assembly for a gas discharge lamp Oct. 19, 2004
6788001 Lighting system with caring preheating of gas discharge lamps Sep. 7, 2004
6736927 Apparatus for increased workpiece throughput May. 18, 2004
6731073 Safety starter for fluorescent lamps May. 4, 2004
6696791 Method for starting a discharge lamp Feb. 24, 2004

1 2 3 4

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