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| Number | Title | Issue Date |
| 7153178 | Method of manufacturing a lamp assembly A lamp assembly configured to inductively receive power from a primary coil. The lamp assembly includes a lamp circuit including a secondary and a lamp connected in series. In a first aspect, the lamp circuit includes a capacitor connected in series with the lamp an... | 12/26/2006 |
| 6921874 | Rotational speed switching apparatus of a ceiling fan A rotational speed switching apparatus includes a seat body in which a rotary shaft is pivotally disposed and a pull rotary assembly for driving the rotary shaft to one-way circularly rotate. Each time the rotary shaft rotates, the rotary shaft rotates by 72 degrees... | 07/26/2005 |
| 6806649 | Starter assembly for a gas discharge lamp The present invention comprises a unique starter assembly for a gas discharge lamp. The starter assembly comprises a main current path with a first leg connected to one electrode of a gas discharge lamp, and a second leg connected to a second electrode of the gas di... | 10/19/2004 |
| 5436527 | Circuit for operating a fluorescent lamp In a circuit for operating a fluorescent lamp with controllable luminance, with the fluorescent lamp comprising a discharge path and heater coils, the discharge path is connected through a transformer to a controllable alternating current source. The curr... | 07/25/1995 |
| 5432406 | Wide range load current regulation in saturable reactor ballast A simple and compact magnetic ballast for powering a wide range of fluorescent lamp load Wattage such as 14 Watt to 60 Watt without need for modification to the ballast unit. Arc current to the lamp load is supplied through a saturable reactor including a... | 07/11/1995 |
| 5247228 | Fluorescent lamp ballast adaptor An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type ballast installed therein. The adaptor circuit contains a... | 09/21/1993 |
| 5216334 | Display bias arrangement An improved display bias arrangement is provided using a DC filament voltage in conjunction with stepped grid voltages to maintain even illumination. In a VF display there is a directly heated cathode (filament), an anode and a grid. If a DC filament volt... | 06/01/1993 |
| 5063328 | Energy saving circuit for discharge tubes Circuits for increasing the efficiency of fluorescent tubes by openings one side of all of the filament circuits of the tubes in response to flow of plasma current. The circuits may be employed in conjunction with the circuits of Lucetta U.S. Pat. No. 3,9... | 11/05/1991 |
| 5049783 | Electronic ballast device for fluorescent lamps In an electronic ballast for at least one fluorescent lamp equipped with heatable electrodes, the heatable electrodes must be adequately preheated before the actual ignition of the fluorescent lamp. Given a high-frequency preheating of the heating electro... | 09/17/1991 |
| 4906899 | Fluorescent lamp regulating system One of the low voltage output windings of a standard ballast circuit is coupled to one filament of a pair of series connected fluorescent lamps by an external current controller. The current controller acts to restrictively reduce the operating voltage ap... | 03/06/1990 |
| 4862035 | Fluorescent lamp unit having plural separate tubes and particular arrangement of circuit elements A fluorescent lamp unit comprising a self-contained assembly intended for use in replacement for a conventional incandescent filament lamp comprises two U-shaped fluorescent tubes (54, 55), each provided with filaments (56, 57) at respective ends of the a... | 08/29/1989 |
| 4644227 | Three lamp ballast A low pressure gas discharge lamp ballast circuit is provided for three series-connected low energy gas discharge lamps, in which a first starting capacitor provides a starting voltage to one of the lamps, and a second starting capacitor provides a starti... | 02/17/1987 |
| 4588924 | High efficiency converter for discharge lamps An energization arrangement for a discharge lamp includes a DC/AC converter to which a discharge lamp (81) is connected. The lamp is shunted by a relay contact (90) to obtain an electric circuit through which two electrodes (83, 84) of the lamp can be pre... | 05/13/1986 |
| 4525649 | Drive scheme for a plurality of flourescent lamps The above and other objects, advantages and capabilities are achieved in one aspect of this invention by a drive scheme for a plurality, that is, for N, where N-2, flourescent lamps. The drive circuit comprises (N+1) pairs of output terminals, each compri... | 06/25/1985 |
| 4513225 | Fluorescent lamp series system A pair of 48-inch long preheat fluorescent lamps, each one and a half inches diameter and consuming less than 10 watts power per foot of length, are connected in series with each other and with a ballast, for operation from 50 or 60 hertz a-c line voltage... | 04/23/1985 |
| 4503488 | Multiple headlamp system A multiple headlamp system for vehicles, comprising at least two individual lamps having their filaments connected in electrical series. This permits the use of shorter filaments and hence smaller diameter reflector lamps, without loss of optical control ... | 03/05/1985 |
| 4441055 | Lighting system A lighting system comprises gaseous discharge lamps (8) connected to a source (1) of regulated alternating current through current transformers (5). The primary windings (6) of the current transformers (5) are connected in series to the source (1). The ga... | 04/03/1984 |
| 4413209 | Series-connected discharge device ballast apparatus A ballast apparatus for series-sequenced gaseous discharge devices having series-connected filaments wherein a transformer is connected to a potential source and to a pair of series-sequenced gaseous discharge devices with a starting capacitor shunting on... | 11/01/1983 |
| 4410836 | Voltage limited ballast for gaseous discharge devices A ballast apparatus for series-sequenced gaseous discharge devices includes at least one pair of series-sequenced discharge devices having series-connected filaments with a first rectifier means coupling a filament of one discharge device to the transform... | 10/18/1983 |
| 4207497 | Ballast structure for central high frequency dimming apparatus An illumination control system for gas discharge lamps which can be dimmed is provided in which a central inverter produces sinusoidal output voltage at about 23 kHz. The amplitude of the inverter output is adjustable to dim the lamps. A transmission line... | 06/10/1980 |
| 4158792 | Light control device for high frequency lighted fluorescent lamp A light control device for a high frequency lighted fluorescent lamp includes a high frequency variable voltage power source. A first impedance element (a capacitor and inductor in series) is provided between the terminals of the lamp on the side opposite... | 06/19/1979 |
| 3975660 | Starterless low-voltage fluorescent-lamp circuit arrangements A starterless circuit arrangement for the ignition and the operation of one or a number of series connected, low voltage fluorescent lamps which are connected with a stray field transformer coupled with a voltage source. The stray field transformer produc... | 08/17/1976 |
| 3954316 | Electrical apparatus and method for reducing power consumption of a fluorescent lamp system An attachment is provided for inclusion in a two-lamp rapid-start type fluorescent lamp and encapsulated ballast transformer combination to reduce the electrical power consumption thereof, comprising an isolation transformer and a capacitor. The isolation... | 05/04/1976 |
