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| Number | Title | Issue Date |
| 7336037 | Intelligent electrical switching device The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a micro... | 02/26/2008 |
| 7327092 | Current driving circuit for inductive loads A circuit for driving the current for inductive loads such as an electron beam deflection coil for an x-ray generator system. The circuit includes two selectable voltage levels provided by a high level and a low level source. A plurality of switches selects the volt... | 02/05/2008 |
| 7239041 | Light emitting device for vehicles A light emitting device includes an input node set, a light emitting unit including at least one light emitting element connected across first and second nodes of the input node set, an impedance matching element having a first end connected to the first node, a swi... | 07/03/2007 |
| 7235900 | Switching apparatus and method for varying a phase line impedance of an electric power transport line section The switching apparatus and method are provided for varying the impedance of a phase line of a segment of an electrical power line. The phase line includes n conductors electrically insulated from each other and short-circuited among each other at two ends of the se... | 06/26/2007 |
| 7220016 | Flashlight with selectable output level switching A flashlight has a lamp, a power source, two switches, and a controller connected to the switches. The first switch controls delivery of power to the lamp, and the second switch selects a dimmed brightness level. The first switch may invoke the dimmed level, or a ma... | 05/22/2007 |
| 7213961 | Low voltage luminaire assembly A low-voltage luminaire assembly is provided with a transformer and a lamp holder, one or more of which have quick-release connections. Methods for installing and servicing the luminaire assembly are also provided. The luminaire assembly may also have a plurality of... | 05/08/2007 |
| 7186002 | Flashlight with selectable output level switching A flashlight having a lamp, a power storage element, a switch, and an electronic controller. The controller has a switch input connected to the switch and operates in response to the input to deliver power from the power storage element to the lamp. The controller m... | 03/06/2007 |
| 7129653 | Self-contained, self-snubbed, HID dimming module that exhibits non-zero crossing detection switching A protection circuit for an HID dimming circuit is provided. A resistive component limits the initial current after a relay closes and current flows from a charged capacitor to a second capacitor. An inductive component limits the rate of change of current through t... | 10/31/2006 |
| 7009347 | Multiple discharge load electronic ballast system An embodiment of the present invention pertains to a multiple discharge load electronic ballast system, including a distribution bus and a plurality of electronic ballasts. The distribution bus has a nominal distribution power rating. The plurality of electronic bal... | 03/07/2006 |
| 6952084 | Intelligent electrical switching device The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a micro... | 10/04/2005 |
| 6903376 | Selective placement of quantum wells in flipchip light emitting diodes for improved light extraction In accordance with embodiments of the invention, a light emitting device includes a light emitting region and a reflective contact separated from the light emitting region by one or more layers. In a first embodiment, the separation between the light emitting region... | 06/07/2005 |
| 6756951 | Display apparatus and driving circuit of display panel A display apparatus and a driving circuit of a display panel, in which even when an anode line driving circuit is made of a plurality of IC chips, light emission luminance values on the display panel can be uniformed. The display apparatus is made of a plurality of ... | 06/29/2004 |
| 6693390 | Load driving apparatus A load driving apparatus is constituted with a high voltage power source, a low voltage power source, a first switching element, a second switching element, a lamp load, current detecting section, and PWM control section. The first switching element is co... | 02/17/2004 |
| 6507333 | Tribo-addressed and tribo-supperessed electric paper A display is provided with an insulative layer with electrical properties which have been selected so that the display can be addressed with a stylus and which minimizes the effects of stray triboelectrically generated charges. Also provided is a method o... | 01/14/2003 |
| 5770924 | Ignitional run circuit that immediately applies only a DC voltage after lamp ignition but before the main AC potential is applied To largely, or entirely inhibit glow discharges during the start-up or run-on phase (Ta) of a high-pressure discharge lamp, the lamp is operated in a second time period (T2) immediately after ignition (T1) with continuous direct current during which the e... | 06/23/1998 |
| 5635800 | Ballast circuit with a japped transformer flyback converter providing driving energy for start, glow and run modes of a lamp Circuit arrangements generate start, glow, and/or run signals to be applied to and for operating a DC arc discharge lamp. A first circuit arrangement provides start, glow, and run signals. The first circuit arrangement includes a tapped transformer flybac... | 06/03/1997 |
| 5578906 | Field emission device with transient current source A field emission device (100) having an electron emitter (101), for emitting electrons, an extraction electrode (102) proximally disposed with respect to the electron emitter (101), an anode (103) for collecting some of any emitted electrons is formed. An... | 11/26/1996 |
| 5498934 | Electronic flashlight Connected in circuit between the battery and the light bulb in a flashlight is a slide switch and an electronic forward converter. The slide switch has an OFF-position, an ON-position, and a spring-loaded variable BOOST-position. In full BOOST, the electr... | 03/12/1996 |
| 5418433 | Flashlight with hybrid battery and electronic control circuit A flashlight has a hybrid battery pack consisting of a primary-cell battery (ex: an Alkaline battery) and an auxiliary rechargeable battery of low internal resistance (ex: a Ni--Cad battery). Connected in circuit between the batteries and the flashlight's... | 05/23/1995 |
| 5384516 | Information processing apparatus including a control circuit for controlling a liquid crystal display illumination based on whether illuminatio power is being supplied from an AC power source or from a battery An information processing apparatus employs a liquid crystal display and a fluorescent lamp for backlighting the screen of the liquid crystal display. A lighting circuit for supplying alternating current lighting power to the fluorescent lamp receives inp... | 01/24/1995 |
| 5323089 | Method for the pulsed mode of operation of high-pressure discharge lamps In a method for operating high-pressure discharge lamps in a pulsed mode to improve the light properties thereof, gating pulses for the high-pressure discharge lamp are in the form of pulse groups of bipolar individual pulses with a pulse width of less th... | 06/21/1994 |
| 5315215 | High-voltage switching circuit A pair of transistors (110 and 112) configured with their channels connected in series. The gate of the "upper" transistor (110) is coupled to a relatively low-voltage, DC power supply voltage by a voltage-clamping and current-steering diode (144); to a r... | 05/24/1994 |
| 5252893 | Light flasher apparatus A rechargeable electronic flasher powered by a solar panel and solar-rechargeable battery. The circuit has particular application as an auxiliary safety measure for use in roadway cats' eyes, or in memorial symbols for mounting on, or near, grave stones a... | 10/12/1993 |
| 5233271 | Starting device and lamp base construction for a Philips lamp A lamp having a lamp base, switches, AC power supply, a Philips lamp, battery, and circuit board. In addition to a conventional circuit of AC for starting the Philips lamp, there is also a loop using DC to start the Philips lamp. The loop includes the con... | 08/03/1993 |
| 5198727 | Acoustic resonance operation of xenon-metal halide lamps on unidirectional current Miniature high pressure arc lamps containing a substantial pressure of xenon, in addition to metal halide and mercury, can provide instant light at turn-on and are suitable for automotive headlamps. The xenon aggravates convection which causes arc-bowing ... | 03/30/1993 |
| 5170099 | Discharge lamp lighting device A discharge lamp lighting device includes a DC power supplying means which supplies as superposed on a high frequency power fed to a low-tension, mercury-arc discharge lamp a DC power of a level capable of maintaining a discharge upon low light flux light... | 12/08/1992 |
| 5144189 | Automotive high voltage discharge lighting system and assembly The assembly of a headlight and a connector has in the headlight an electric discharge lamp with a lamp cap and contacts at this lamp cap, which cap is attached by a fixing member to a reflector. The headlight has beside the lamp cap a contact member. The... | 09/01/1992 |
| 5068577 | Constant current drive system for fluorescent tubes Novel systems, circuits, and methods for initiating ionization, maintaining constant illumination current, and extinguishing illumination in a gas discharge tube and in gas discharge tube arrays. Input controls for current regulating circuits for gas disc... | 11/26/1991 |
| 5047695 | Direct current (DC) acoustic operation of xenon-metal halide lamps using high-frequency ripple A method and a ballast circuit are disclosed for operating a xenon-metal halide lamp particularly suited for automotive applications with a direct curernt (DC) levels having selectable amount of ripple imposed thereon. The ripple provides for acoustically... | 09/10/1991 |
| 5039915 | Multipurpose fluorescent light device A multipurpose fluorescent light device suitable for use with power sources of 12 volts DC and 220 volts AC without having to use a voltage transformer, comprising a fluorescent lamp, a pair of antivibration covers, a starter switch, a circuit board assem... | 08/13/1991 |
| 4887007 | DC-AC converter for supplying a gas and/or vapour discharge lamp A DC-AC converter for supplying energy to a dishcarge lamp (17). The converter is in the form of an imcomplete half-bridge circuit (11, 12; 15, 16, 19, 18). The lamp (17) is connected in series with a coil (18) and a capacitor (16). Two switching elements... | 12/12/1989 |
| 4855646 | Fluorescent illuminator with inverter power supply A fluorescent illuminator including a fluorescent lamp, a lamp housing, and a lamp power supply with a variable current output with a relatively fixed frequency at least an order of magnitude greater than line frequency and a non-integral multiple thereof... | 08/08/1989 |
| 4812712 | Plasma processing apparatus A plasma processing apparatus wherein a means is provided to apply the proper negative DC voltage through a filter circuit to an electrode for generating the low-temperature plasma through the feed of the high-frequency power. When the high-frequency powe... | 03/14/1989 |
| 4803406 | High-pressure discharge lamp operating circuit A high-pressure discharge lamp operating circuit performs a low-frequency AC operating at an early stage of operating and thereafter performs a high-frequency AC operation or DC operation during the steady-state of lamp operation. This circuit comprises a... | 02/07/1989 |
| 4779026 | Rapid-start high-pressure discharge lamp, and method of its operation To provide for pre-heating of low-power small metal halide high-pressure charge lamps (1), at least one of the electrodes (16) is formed as a heater wire by introducing a thin tungsten wire, in V shape, into one end of the elongated bulb (2), and carryin... | 10/18/1988 |
| 4749914 | Circuit system for igniting and operating a high-pressure discharge lamp, particularly a sodium vapor lamp A circuit system for igniting and lighting a high-pressure discharge lamp, particularly a sodium vapor lamp, comprising a pulse generator for generating signals of at least 1 kHz frequency being a high-frequency DC/AC converter connected to a direct curre... | 06/07/1988 |
| 4749913 | Operating circuit for a direct current discharge lamp A power supply for a metal halide discharge lamp includes a circuit for applying a high voltage starting pulse to the arc tube of the lamp to initiate the discharge, a glow transition current to provide power transitioning the arc tube from its glow to it... | 06/07/1988 |
| 4749908 | Emergency power supply An emergency power supply including an input for connection to a power line, an output for connecting the input to electrical equipment so as to supply power thereto from the power line, a supplemental power supply connected to the output and adapted to s... | 06/07/1988 |
| 4742276 | Regulated deuterium arc supply system An improved power supply system of smaller size and lower cost than prior art supplies is described for starting and maintaining the running of a deuterium arc lamp at a constant current level; by use of switching circuitry with solid-state components the... | 05/03/1988 |
| 4704563 | Fluorescent lamp operating circuit A fluorescent lamp operating circuit includes a high frequency electronic ballast circuit for providing a controlled output to a fluorescent lamp load. A control signal is detected from the power line carrier which includes binary data indicative of the i... | 11/03/1987 |
