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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 |
| 7125159 | Non-defeatable fluorescent adapter for incandescent fixture A fluorescent adapter having a housing including a tip contact compatible with an electrical socket, a threaded ring contact compatible with the electrical socket, the ring contact surrounding the housing and rotatable with the housing when the housing is rotated in... | 10/24/2006 |
| 7119777 | Pixel structure of active organic light emitting diode A pixel structure of active organic light emitting diode is disclosed, which comprises an organic light emitting diode, a data-line, a scan-line, a switch thin film transistor (TFT), a control TFT, and a capacitor. The switch TFT has a first lightly doping drain and... | 10/10/2006 |
| 6958579 | Thermally-protected ballast for high-intensity-discharge lamps A ballast for electrical lighting fixtures has improved thermal protection features. The ballast has ballast laminations, primary and secondary coils, and a thermal protector, the thermal protector being wired in series with the secondary coil. When the ballast is o... | 10/25/2005 |
| 6396219 | Flasher string A flasher string which includes a plurality of flashers connected in series and a plurality of thyrsitor diodes, each thyrsitor diode connected to a respective flasher in parallel. The flasher can periodically turn on and off to produce a twinkling light ... | 05/28/2002 |
| 6194846 | Starter circuit with a safety switch A start circuit (1) includes a series connection of a glow switch (10) and a safety switch (12), which are each provided with an enclosed space (10a, 12a), with a pair of current conductors (10b, 10c resp. 12b, 12c) which enter the enclosed space and with... | 02/27/2001 |
| 5977692 | Annulus fluorescent lamp with overheat protection An annulus fluorescent lamp comprises two annulus fluorescent tubes formed into shapes having different diameters and disposed substantially concentrically in substantially the same plane. Each of the annulus fluorescent tubes has a first end with an elec... | 11/02/1999 |
| 5841240 | Efficient discharge lamp electrode heating circuit operable over wide temperature and power range A circuit arrangement for operating a discharge lamp comprising input terminals for connection to a supply voltage source. A load branch B has terminals for holding the discharge lamp and includes an inductive ballast. A device I is coupled to ends of the... | 11/24/1998 |
| 5483127 | Variable arc electronic ballast with continuous cathode heating A fluorescent lighting control system providing automatic and/or manual adjustability of the arc current(s) in one or more fluorescent lamps to permit operation of the lamps at less than rated wattage, and its concomitant luminous flux, in interior buildi... | 01/09/1996 |
| 5479075 | Fluorescent lamp starter circuit A fluorescent lamp starter circuit includes a relay which forms a first circuit loop to detect the input voltage and to switch the relay from the normally-closed position to the normally-open position once the input voltage reaches the threshold level. Th... | 12/26/1995 |
| 5034657 | Thermal-switch instant starter for a fluorescent light A thermal-switch instant starter for a fluorescent light which initiates a high voltage instantly across its electrodes comprises a high voltage initiating tube including therein a fixed electrode and a movable electrode oppositely spaced from each other ... | 07/23/1991 |
| 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 |
| 4857808 | Modified impedance rapid start fluorescent lamp system A modified impedance rapid start fluorescent lamp system is provided with interrupted cathode heating. This structure includes a circuit in parallel with one of the bimetal switches at each side of a cathode. The circuit includes a current limiting capaci... | 08/15/1989 |
| 4730147 | Method and arrangement for the operation of a gas discharge lamp For the operation of warm start gas discharge lamps upon employment of an electronic ballast wherein the gas discharge lamp lies parallel to the effective capacitance of a series-resonant circuit and has its heater coils incorporated into this series-reso... | 03/08/1988 |
| 4695768 | Bimetal switch for electrode heat cutout within an electrically insulating support A fluorescent lamp electrode heat cutout switch is provided for placement within a fluorescent lamp stem and outside the discharge envelope and is configured such that a resistive heater wire is connected to one electrode lead-in and a bimetallic switch e... | 09/22/1987 |
| 4649320 | Thermal protector for circular fluorescent lamp assembly A circular fluorescent lamp assembly having the entire ballasting circuit, along with a thermal protector, contained within the assembly's lamp holder. The thermal protector serves the dual function of preventing permanent damage to the assembly's ballast... | 03/10/1987 |
| 4647817 | Discharge lamp starting circuit particularly for compact fluorescent lamps To provide for reliable ignition of low-pressure discharge lamps, particularly compact fluorescent lamps, operated at high frequency, for example in the order of about 45 kHz, an ignition circuit is connected in parallel to the lamp and serially with the ... | 03/03/1987 |
| 4645976 | Discharge lamp circuit with protected PTC resistor An electrical device for igniting and supplying a low-pressure mercury vapor discharge lamp (11) provided with two preheatable electrodes (12,13). A series arrangement (12, 4, 14, 13) comprising the two lamp electrodes (12, 13), a PTC resistor (14) and a ... | 02/24/1987 |
| 4593231 | Three-way fluorescent lamp device A ballast circuit for starting and operating a preheat type circular fluorescent lamp, which replaces a multiple wattage incandescent lamp in a three-way incandescent lamp socket, so that the fluorescent lamp can be ignited to function at three different ... | 06/03/1986 |
| 4481446 | Metal vapor discharge lamp In a metal vapor discharge lamp for operating it by high voltage generated in the actuation of a heat sensitive switch means in an outer bulb, a relatively low pressure of a sealed gas or mercury is sealed in the outer bulb to operate the heat sensitive s... | 11/06/1984 |
| 4461976 | Discharge lamp starter A discharge lamp starting device employing a thermal switch which comprises main and auxiliary bimetal electrodes respectively thermally bendable in the same direction, and an auxiliary heater for heating the auxiliary bimetal electrode in addition to a m... | 07/24/1984 |
| 4425530 | Time delay lamp ballast circuit A multiple fluorescent lamp ballast circuit of the rapid start type in which heating current is supplied to the lamp cathodes. A time delay switch is connected in series with a starting capacitor across one or more of the lamps, to delay lamp starting unt... | 01/10/1984 |
| 4386296 | Fluorescent light unit with dual light levels A screw-in fluorescent light unit having two light levels, for use in a 3-way socket. A reactor ballasts the lamp for high light output, and a positive temperature coefficient resistor (thermistor) is added to ballast the lamp for low light output and to ... | 05/31/1983 |
| 4358710 | Fluorescent light unit with dimmable light level A screw-in fluorescent light unit having high and low light levels, for use in a 3-way socket. A reactor ballasts the lamp for high light output, and a variable dimming circuit is added to ballast the lamp for variable low light output.... | 11/09/1982 |
| 4358709 | Fluorescent light unit with dual light levels A screw-in fluorescent light unit having two light levels, for use in a 3-way socket. A reactor ballasts the lamp for high light output, and a resistor is added to ballast the lamp for low light output. A bilateral switch device is connected across the re... | 11/09/1982 |
| 4345186 | Metal vapor discharge lamp A metal vapor discharge lamp comprises main electrodes and an auxiliary electrode in an arc tube to initiate the discharge between the main electrode and the auxiliary electrode at the initiation of the operation and then to result the discharge between t... | 08/17/1982 |
| 4322658 | High intensity discharge lamp containing electronic starting aid A high intensity discharge lamp comprises a two-electrode arc tube and an external starting probe supported from a base and preferably sealed within an outer envelope to which the base is attached. The base contains an electronic pulsing circuit comprisin... | 03/30/1982 |
| 4268780 | Integrated fluorescent-incandescent lamp assembly A lamp assembly (10) comprises a base plate (12) having both an incandescent bulb (18) and a fluorescent bulb (16) affixed thereto. The incandescent bulb (18) acts as ballast and light source. A glow switch (26) and capacitor (27) act as starter and are c... | 05/19/1981 |
| 4256991 | Electronic igniter for fluorescent lamps Methods and apparatus for electronically igniting gas discharge lamps, such as hot- or cold-cathode fluorescent lamps, various high-pressure, metal-gas, and halogen-gas lamps. The initial heater current, in the case of hot-cathode lamps, or the initial hi... | 03/17/1981 |
| 4208616 | Inductive stabilization ballast for a discharge lamp An inductive stabilization ballast for a low-pressure mercury vapor discharge lamp having preheatable electrodes. The ballast includes a protective device which comprises a positive temperature coefficient resistor. The inductive portion of the ballast an... | 06/17/1980 |
| 4178535 | Three-way brightness fluorescent lampholder fitting A fluorescent lampholder fitting has a preheat type circular fluorescent lamp with its ends in proximity and having a first end provided with a starting filament with a first and second filament terminal wire, and a second end provided with a second start... | 12/11/1979 |
| 4170744 | Combination discharge-incandescent lamp with thermal switch control A combination lamp comprises a miniature arc tube, a standby filament and a thermal switch in a sealed vitreous envelope. The switch is connected in series with the filament, and the arc tube and the filament have separate inleads for external connections... | 10/09/1979 |
| 4165475 | Discharge lamp with starter circuit A starter circuit for a hot cathode discharge lamp which has a switching element which is connected across the lamp to permit a cathode heating current to flow and then opens to permit the lamp to strike. The starter circuit has a thyristor as the switch ... | 08/21/1979 |
| 4066926 | Gas-filled incandescent lamp with integral fuse assembly Protection against potentially destructive arcs which may occur within a gas-filled incandescent lamp when the energized filament fails is achieved by partly embedding separate inner and outer lead-in conductors in an hermetic seal that is formed on one e... | 01/03/1978 |
| 3974418 | Fluorescent lamp unit with ballast resistor and cooling means therefor An integral self-contained fluorescent lamp unit comprising an elongated lamp and an elongated ballast resistor adjacent to and alongside the lamp. Metal strip heat radiators are positioned adjacent to and alongside the ballast resistor for dissipating it... | 08/10/1976 |
| 3965387 | Electric lamp and thermal switch therefore An improved thermal switch permitting large temperature excursions beyond the design closure temperature without stressing the switch material beyond its elastic limits. It combines a bimetal portion with a spring portion through which movement is transmi... | 06/22/1976 |
| 3953763 | Pulsed xenon arc lamp operating circuit A circuit for the repetitively pulsed operation of a xenon arc discharge lamp. A first SCR is responsive to a first control circuit when fired to allow the charging of a capacitor through a first inductor from a DC energy source. A second SCR is responsiv... | 04/27/1976 |
