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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7268444 | Feed line structure A supply line structure for supplying energy to the electrical components of an automotive vehicle and for transmitting information between at least some of the electrical components, the supply lines being disposed, in particular in a star structure having at least... | 09/11/2007 |
| 7091947 | Apparatus and method for prolonging lamp lifetime An apparatus for prolonging lamp lifetime by reducing luminance of a least one lamp (5) in phases includes an image signal outputting unit (1), a scaler (2), and a Microprogrammed Control Unit (MCU) (4). The MCU further includes a CPU ( | 08/15/2006 |
| 7026767 | High-efficiency power supply apparatus used with a display panel driving system and method thereof A high-efficiency power supply apparatus used with a driving system of a display panel and a method of designing the same to improve an electrical power efficiency by providing a non-isolated direct current (DC) power directly to a display panel driving circuit comp... | 04/11/2006 |
| 6995337 | Power source with saturable reactor In a power source for an electric arc welder including an inverter having two primary circuits connected in a series circuit across the DC bus of an input rectifier where each primary circuit comprises a capacitor parallel with a primary winding section and a switch... | 02/07/2006 |
| 6987363 | Emergency ballast for compact fluorescent lamp with battery heater An emergency ballast for a compact fluorescent lamp including a heater disposed adjacent the battery for maintaining the battery at a safe and effective operating temperature during the time which the lamp is powered by the normal AC power supply. Additionally, the ... | 01/17/2006 |
| 6566818 | High-efficiency and light-adjustable lighting means of two-electrode lamp A lighting and starting device for two-electrode lamp includes a plurality of voltage-multiplier rectifying circuits parallelly connected to two electrodes of the lamp with stepping voltages, for instance, high, medium and low voltage levels, whereby upon... | 05/20/2003 |
| 6118224 | Discharge lamp lighting device A discharge lamp lighting device includes an inverter circuit connected through a first impedance element across output ends of a rectifier rectifying an AC source power, a smoothing capacitor inserted through a discharging diode in a power supply path to... | 09/12/2000 |
| 6049178 | Circuit for controlling operation of an emergency exit lamp In a circuit for controlling operation of an emergency exit lamp, a delay circuit enables a trigger circuit a preset time period after a power outage has occurred. Once enabled, the trigger circuit activates a relay so as to connect a storage battery to a... | 04/11/2000 |
| 5986407 | Control apparatus for permitting operation of an ac-powered lamp unit as an emergency lighting device A control apparatus for an ac-powered lamp unit includes a charging circuit for generating a constant current output from an ac power source, a storage battery charged by the constant current output and supplying a dc voltage output, a first high-voltage ... | 11/16/1999 |
| 5912535 | Driving circuit for an electric luminescent panel including first and second driving circuits A circuit driving electric luminescent panel in which the high potential contact of electric luminescent panel is connected to two parallel connected transistors of which the emitter of the first transistor is connected to a current--resisting coil and th... | 06/15/1999 |
| 5896013 | Operating circuit for an inductively ballasted arc discharge lamp Ballast circuitry for a metal halide lamp is disclosed enabling sustained operation with a typical 120 volt AC power source. A novel auxiliary circuit network is operatively associated with inductive type starting circuit means to provide lamp reignition ... | 04/20/1999 |
| 5838115 | Gas discharge device In a gas discharge device having a gas discharge channel, which comprises two gas discharge electrodes and a gas discharge volume lying between said electrodes, having an energy storage circuit connected by a switching device to the gas discharge electrod... | 11/17/1998 |
| 5828182 | Apparatus for supplying power from a ballast circuit to an auxiliary load The present invention is directed to a power supply circuit for controlling a load which, for example, includes both a gas-discharge lamp and an auxiliary load. The power supply circuit includes a ballast circuit for limiting current supplied to the gas d... | 10/27/1998 |
| 5811938 | Emergency lighting ballast for starting and operating two compact fluorescent lamps with integral starter A method and circuit for operating two fluorescent lamps having a starter with power supplied by a battery by generating an alternating current from energy supplied by the battery, supplying the alternating current as a starting current to the lamps for a... | 09/22/1998 |
| 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 |
| 5449989 | Energy conversion system An energy conversion device includes a discharge tube which is operated in a pulsed abnormal glow discharge regime in a double ported circuit. A direct current source connected to an input port provides electrical energy to initiate emission pulses, and a... | 09/12/1995 |
| 5266869 | Discharge lamp lighting apparatus having output impedance which limits current flow therethrough after start of discharging A discharge lamp lighting apparatus comprises a transformer for stepping up an AC power source voltage from an AC power source to produce a high voltage as an output voltage required for lighting a discharge lamp. Particularly, the lighting apparatus furt... | 11/30/1993 |
| 5191261 | Switching power supply for high-voltage flash lamps A flash lamp power supply system, comprising (a) a simmer power supply circuit, comprising (i) a DC simmer power supply, (ii) means for connecting a flash lamp in series with the DC power supply, and (iii) a capacitor connected in parallel to the power su... | 03/02/1993 |
| 5172032 | Method of and apparatus for the energization of electroluminescent lamps An electroluminescent lamp is energized by being charged to a first polarity voltage level in step-wise fashion over a first period of time and then being discharged and charged to a second polarity voltage level in a time period which is short when compa... | 12/15/1992 |
| 5095251 | Low voltage DC light apparatus for a neon lamp A lighting apparatus for a neon lamp includes a direct current power supply with a relatively low voltage output. The direct current power supply actuates a pulse oscillator to produce a narrow pulse voltage train output. The narrow pulse voltage train ou... | 03/10/1992 |
| 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 |
| 5045759 | Power supply for laser flashlamp An N-phase power supply (1) for operation of a laser flashlamp (F). A first electrical circuit (3) is connected between an N-phase source of electrical energy and the flashlamp for continuously supplying electrical current thereto. A second electrical cir... | 09/03/1991 |
| 5015919 | Emergency lighting system provided with a fluorescent tube An emergency lighting system provided with a U-shaped fluorescent tube having power supplied by a square wave oscillator connected to a relatively small sized battery. A battery charger is employed to charge the battery when the standard AC source is conn... | 05/14/1991 |
| 5004953 | Emergency lighting ballast for compact fluorescent lamps with integral starters A method and circuit for operating a fluorescent lamp having a starter with power supplied by a battery by generating an alternating current from energy supplied by the battery; supplying the alternating current as a starting current to the lamp for a sel... | 04/02/1991 |
| 5001386 | Circuit for dimming gas discharge lamps without introducing striations A dimming circuit provides power from an ac source to a compact fluorescent lamp. The circuit generally includes a resonant circuit driven by a high-frequency switching inverter. The resonant circuit is essentially an ac current source and provides sinuso... | 03/19/1991 |
| 4890041 | High wattage HID lamp circuit A lamp start, hot-restart and operating circuit for a high wattage, high intensity discharge lamp includes cascaded resonant circuits with capacitors and series-connected inductors connected to an AC source. A pulse circuit including two pulse transformer... | 12/26/1989 |
| 4818917 | Fluorescent lighting ballast with electronic assist A ballasting circuit for fluorescent lamps includes a series-connected current limiting ballast element and an electronic assist circuit. The ballast element has a high voltage side connectable to a commercial 110 VAC/60 hertz power source and a low volta... | 04/04/1989 |
| 4792727 | System and method for operating a discharge lamp to obtain positive volt-ampere characteristic A system and associated method for operating a gas discharge lamp so as to provide a positive voltage-current characteristic. An AC or DC source is used to provide electron heating, without in itself providing ionization, of the lamp gas. Superimposed on ... | 12/20/1988 |
| 4734841 | Laser power supply circuit A power supply circuit for a gas laser has primary circuitry and secondary circuitry supplied by the primary circuitry. A transformer is positioned between the primary circuitry and a secondary circuitry. Within the secondary circuitry is a spark gap and ... | 03/29/1988 |
| 4651061 | Apparatus to facilitate lengthening the life of incandescent lamps An energizing circuit for an incandescent light bulb includes two rectifiers with their outputs connected in parallel across the bulb. One rectifier has a low voltage output to keep the bulb filament warm while the other rectifier, which is energized by c... | 03/17/1987 |
| 4631451 | Blast gap ignition system A spark plug for an ignition system has a ring gap between two electrodes. A first electrode has a ring shape defining a central opening. A second electrode is positioned within the central opening of the first electrode. An insulating material is positio... | 12/23/1986 |
| 4620136 | Digital vertical beam landing correction circuit Circuitry corrects vertical beam landing errors for color cathode ray tubes. A digital delay circuit provides horizontal scan line video pixel information at its proper location to produce a distortion corrected raster. Accurate correction is provided by ... | 10/28/1986 |
| 4614898 | Electronic ballast with low frequency AC to AC converter A gas discharge lamp is started with a high frequency AC signal from an oscillator and then operates on a low frequency AC signal provided by an AC to AC converter synchronously with the AC supply line. The low voltage switching devices of the converter a... | 09/30/1986 |
| 4591761 | Relaxation oscillator synchronizer for pulsed laser operation Pulse stability is provided to a pulsed gas filled electrical discharge device by an electrical circuit including first and second electrical energy storage means, with the energy stored in the first storage means being substantially greater than the ener... | 05/27/1986 |
| 4575658 | Power supply for a ring laser A power supply circuit is disclosed for a ring laser having a cathode and having first and second anodes so that the ionization current between the cathode and each of the anodes are substantially equal. According to the invention, a Zener diode is electr... | 03/11/1986 |
| 4550272 | Operating circuit for electric discharge lamp There is disclosed an operating circuit for an electric discharge lamp in which a first DC operating circuit for starting an electric discharge lamp, a second DC operating circuit for making the electric discharge lamp operative by a voltage near a rated ... | 10/29/1985 |
| 4530550 | Power supply unit for electronic flash A power supply unit for electronic flash includes a plurality of charging units connected to a main capacitor of an electronic flash through diodes which prevent a reverse current flow. Each charging unit includes a d.c. source and a booster converter. An... | 07/23/1985 |
| 4510419 | Grip-type photographic flash discharge device A photographic flash device comprising a grip portion and a flash unit removably attachable thereto. Both the grip portion and flash unit house battery-powered DC-DC converters which cooperate upon attachment of the flash unit to the grip portion in charg... | 04/09/1985 |
| 4500812 | Electronic ballast circuit An electronic ballast circuit for a lower pressure lamp wherein a voltage divider network coupled by a capacitor and directly coupled to an AC source is shunted by a series connected transistor switch and capacitor filter, and the switch is coupled by a d... | 02/19/1985 |
| 4469981 | Circuit for the operating of gas discharge lamps In a circuit for the operating of gas discharge lamps in which a starting circuit (2, 17) having a starter transformer (17) and a source of auxiliary voltage which can be disconnected after starting has been effected are provided for the starting of the l... | 09/04/1984 |
