| Patents for H05B 41 - Circuit arrangements or apparatus for igniting or operating discharge lamps (35,100) |
|---|
| 03/15/1977 | US4012664 Ignition arrangement for an electronic flashtube |
| 03/01/1977 | US4010400 Light generation by an electrodeless fluorescent lamp |
| 03/01/1977 | US4010399 Switching circuit for a fluorescent lamp with heated filaments |
| 03/01/1977 | US4010398 Or vapor discharge lamp |
| 02/22/1977 | US4009416 Method for operating a gaseous discharge lamp with improved efficiency |
| 02/22/1977 | US4009412 Fluorescent lamp ballast circuit with magnetic switch |
| 02/22/1977 | US4009387 Automatic energy control lighting system with automatically variable dc source |
| 02/15/1977 | US4008414 Circuit for powering fluorescent lamps |
| 02/08/1977 | US4007416 Voltage regulating transformer |
| 02/08/1977 | US4007399 Flashing circuitry |
| 02/08/1977 | US4007398 Automatic control device for an electronic flash apparatus |
| 02/01/1977 | US4006384 Lead-lag, series-sequence starting and operating apparatus for three to six fluorescent lamps |
| 01/25/1977 | US4005337 Constant energy strobe source |
| 01/25/1977 | US4005336 High intensity discharge lamp starting circuit |
| 01/25/1977 | US4005335 High frequency power source for fluorescent lamps and the like |
| 01/25/1977 | US4005333 Apparatus for increasing output efficiency of an optically pumped Nd:YAG laser |
| 01/25/1977 | US4005331 High intensity discharge lamp with auxiliary light |
| 01/18/1977 | US4004188 Starting circuit for inverter operated gaseous discharge lamps |
| 01/18/1977 | US4004187 Push-pull inverter ballast for arc discharge lamps |
| 01/18/1977 | US4004185 Electric lighting systems |
| 01/18/1977 | US4004184 Apparatus for operating gaseous discharge lamps on direct current from a source of alternating current |
| 01/04/1977 | US4001640 Single trigger photographic strobe unit |
| 01/04/1977 | US4001639 Preferential power distribution system for battery powered camera having electronic flash unit |
| 01/04/1977 | US4001637 Lamp ballast |
| 01/04/1977 | US4001633 Device provided with a gas and/or vapor discharge tube |
| 12/21/1976 | US3999193 Automatic control indication device in an automatic control type electronic flash unit |
| 12/21/1976 | US3999100 Lamp power supply using a switching regulator and commutator |
| 12/21/1976 | US3998534 Electronic photographic flash unit |
| 12/14/1976 | US3997815 Studio lighting system |
| 12/14/1976 | US3997814 Discharge lamp lighting device |
| 12/07/1976 | US3996495 High efficiency ballast system for electric discharge lamps |
| 12/07/1976 | US3996494 Light intensity monitoring and adjusting apparatus for xenon lamp type light fastness tester |
| 12/07/1976 | US3996493 Fluorescent lamp unit having ballast resistor |
| 11/23/1976 | US3993929 Automatic correct exposure indicator |
| 11/23/1976 | US3993928 Extended range correct exposure annunciator |
| 11/16/1976 | US3992643 Load current pulse control devices |
| 11/09/1976 | US3991344 Solid-state dimmer for dual high pressure discharge lamps |
| 11/09/1976 | US3991340 Discharge lamp lighting apparatus including a sintered type oxide negative resistance starting element |
| 11/02/1976 | US3989983 Light source apparatus |
| 11/02/1976 | US3989976 Solid-state hid lamp dimmer |
| 10/26/1976 | US3988647 Method for making a circuit board and article made thereby |
| 10/26/1976 | US3988635 Slow motion timing circuit for a stroboscope |
| 10/19/1976 | US3987339 Constant power lamp ballast |
| 10/19/1976 | US3987336 Arrangement intended for the ignition and alternating current supply of a gas and/or vapor discharge tube |
| 10/12/1976 | US3986076 High efficiency supply circuit for an electric discharge lamp |
| 10/05/1976 | US3984726 Ultraviolet light system having means for maintaining constant intensity light profile |
| 09/28/1976 | US3983449 Discharge lamp ballast circuits |
| 09/28/1976 | US3983448 Automatic strobo flash device |
| 09/14/1976 | US3980924 Remote light sensor for electronic flash units |
| 09/14/1976 | US3980923 Photographic flash apparatus with multiple units |
| 09/07/1976 | US3979639 Correct exposure annunciator circuit |
| 08/31/1976 | US3978390 Dc-ac inverter for supplying a discharge lamp |
| 08/31/1976 | US3978370 Electronic flash unit |
| 08/31/1976 | US3978369 Solid state starter apparatus for a discharge lamp |
| 08/31/1976 | US3978368 Discharge lamp control circuit |
| 08/24/1976 | US3976915 Gate protection circuit for electronic flash apparatus |
| 08/24/1976 | US3976914 Series SCR gate hold-on circuit |
| 08/24/1976 | US3976913 Automatic flash device |
| 08/24/1976 | US3976911 Illumination system and method and means for operating it |
| 08/24/1976 | US3976910 Operating circuit for discharge lamps with voltage starting circuit and auxiliary lighting means therefor |
| 08/17/1976 | US3975660 Starterless low-voltage fluorescent-lamp circuit arrangements |
| 08/10/1976 | US3974419 Electronic flash apparatus with inhibition of contact bounce false triggering |
| 08/03/1976 | US3973168 Wiring circuits and method for multiple flash-beacons |
| 07/20/1976 | US3971049 System for recording on the film of a camera data relating to the scene being photographed |
| 07/20/1976 | US3970893 Apparatus for controlling the intensity of lights |
| 07/13/1976 | US3969737 Electronic flash unit for cameras adapted to receive flashbulbs |
| 07/13/1976 | US3969652 Electronic ballast for gaseous discharge lamps |
| 07/06/1976 | US3968401 Apparatus for controlling the intensity of a light source |
| 07/06/1976 | US3968400 Flash tube modulator |
| 06/29/1976 | US3967159 Power supply for a laser or gas discharge lamp |
| 06/15/1976 | US3964077 Flash synchronizing mechanism for cameras |
| 06/15/1976 | US3963958 Starting and operating circuit for gaseous discharge lamps |
| 06/15/1976 | US3963945 Device for producing electrical pulses |
| 06/08/1976 | US3962601 Zero crossing relay controlled circuit for high power discharge devices |
| 05/25/1976 | US3959688 Control circuit for xenon flash tubes |
| 05/11/1976 | US3956665 Device for replacing a fluorescent lamp in a serially connected fluorescent lamp system |
| 05/04/1976 | US3954316 Electrical apparatus and method for reducing power consumption of a fluorescent lamp system |
| 04/27/1976 | US3953768 Portable fluorescent lamp and inverter therefor |
| 04/27/1976 | US3953763 Pulsed xenon arc lamp operating circuit |
| 04/20/1976 | USRE28783 Control system for terminating the discharge of a flash lamp |
| 04/13/1976 | US3950640 Lamp control and lamp switch circuit for controlling light balance |
| 04/06/1976 | US3949268 Ballast unit for gas discharge lamps such as fluorescent tubes or the like |
| 04/06/1976 | US3949267 Protective starting circuit for inverter operated gaseous discharge lamps |
| 03/30/1976 | US3947720 Pulsed flash tube regulator using thyristor gate control |
| 03/30/1976 | US3947678 Fluorescent lantern |
| 03/23/1976 | US3946271 SCR strobe lamp control for preventing capacitor recharge during after-glow |
| 03/23/1976 | US3946269 Electronic flash system |
| 03/16/1976 | US3944877 Wireless multiflashlight apparatus for a photographic camera |
| 03/16/1976 | US3944876 Rapid starting of gas discharge lamps |
| 03/09/1976 | US3943406 Control of electronically generated light pulses |
| 03/02/1976 | US3942070 Electric discharge lamp lighting device |
| 03/02/1976 | US3942069 Discharge lamp lighting apparatus and method |
| 02/24/1976 | US3940659 Discharge device control circuit including a thyristor |
| 02/03/1976 | US3936721 Electrical power supplies |
| 02/03/1976 | US3936696 Dimming circuit with saturated semiconductor device |
| 01/27/1976 | US3935505 Fluorescent lamp dimmer |
| 01/27/1976 | US3935502 Ballast circuit for eliminating flicker in gaseous discharge lamps |
| 01/13/1976 | US3932742 Load-control system responsive to operating condition of producer of intermittent radiation |
| 01/06/1976 | US3931544 Fast warm up electronic ballast circuit for a high pressure discharge lamp |
| 01/06/1976 | US3931543 Starting and operating circuit for gaseous discharge lamps |