Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7350936 | Conventionally-shaped light bulbs employing white LEDs LED-based light bulbs having one or more white LEDs, for replacing/retrofitting conventional light bulbs. An exemplary bulb includes at least one first white LED and at least one power connection having a form configured to engage mechanically and electrically with ... | 04/01/2008 |
| 7333011 | LED-based luminaire utilizing optical feedback color and intensity control scheme A system and method for implementing an LED-based luminaire (100) incorporates one or more color channels (32-n). The luminaire includes a controller (50) that uses optical sensing and feedback to control LEDs (30A) in each channel... | 02/19/2008 |
| 7324130 | LED driver with integrated bias and dimming control storage A LED driver IC includes a control module(s) for controlling one or more LED drive parameters and non-volatile memory for storing settings data for that control module(s). The control module(s) is fully integrated into the LED driver IC and does not require any cont... | 01/29/2008 |
| 7290895 | File system for a stage lighting array system A file system for a stage lighting system that maintains the different files associated with the stage lighting system. Each of the files that can represent an effect are maintained within the system within a configuration file. The configuration file can be updated... | 11/06/2007 |
| 7276911 | Detection of malfunctioning bulbs in decorative light strings A system for locating a malfunctioning bulb in a decorative light string uses an antenna that produces an output signal corresponding to the strength of the electric field produced by a portion of the light string near the antenna. An amplifier is coupled to the ant... | 10/02/2007 |
| RE39856 | Multicolor LED lamp bulb for underwater pool lights A multicolor LED lamp bulb includes a hollow lamp body which has a substantially tapered intermediate portion, a longitudinal portion and a stem portion, a lens sealingly engaged with the longitudinal portion, a plurality of different colored LED bulbs mounted in a... | 09/25/2007 |
| 7148632 | LED lighting system A lighting device that can generate light of variable color and intensity under processor control. Multiple lighting devices of a modular design can be incorporated into a lighting system to illuminate larger areas. A lighting module includes three groups of LEDs ea... | 12/12/2006 |
| 7145343 | Repair device for decorative light shunt A repair device for fixing a malfunctioning shunt across a failed filament in a light bulb in a group of series-connected miniature decorative bulbs includes a high-voltage pulse generator producing one or more pulses of a magnitude greater than the standard AC powe... | 12/05/2006 |
| 7102298 | Integral lamp An integrated lamp/lamp electronics unit includes a lamp having a first end with first end electrical terminals, and a second end with second end electrical terminals. An end cap having an interior section is placed into electrical connection with the first end elec... | 09/05/2006 |
| 7038399 | Methods and apparatus for providing power to lighting devices Methods and apparatus for providing power to devices via an A.C. power source, and for facilitating the use of LED-based light sources on A.C. power circuits that provide signals other than standard line voltages. In one example, LED-based light sources may be coupl... | 05/02/2006 |
| 6933684 | Electronic ballast using cut and save technology An ideal filament preheat technique in flourescence lamp is supplied by an adjusting circuit, an output circuit and a control circuit. At the filament preheating stage, an adequate preheating voltage is provided for the filament of the lamp tube, and the voltage cro... | 08/23/2005 |
| 6759810 | Transmission structure for animated ornamental lightings A transmission structure for animated ornamental lighting comprising an ornamental body, at least one transmission device mounted within said ornamental body, at least one illumination element mounted with the ornamental body 11; and at least one transmission... | 07/06/2004 |
| 6534929 | Electromagnetic ballast for sequentially starting a plurality of a gaseous discharge lamps An electromagnetic ballast for sequentially starting and simultaneously operating first and second gaseous discharge lamps includes a transformer having a magnetic core, a primary winding for connection to an AC voltage source and first and second seconda... | 03/18/2003 |
| 6459216 | Multiple CCFL current balancing scheme for single controller topologies The multiple lamp circuit for minimizing lamp current imbalance comprises at least one transformer comprising primary windings and secondary windings. Multiple lamps are coupled in serial to the secondary windings of the transformer. Multiple separated la... | 10/01/2002 |
| 6300878 | Constant current regulator using IGBT control A constant current regulator that receives an AC input current from a source provides a constant AC current to a load. The regulator includes first, second, third, and fourth electronically controllable switches, a transformer coupled to the switches, and... | 10/09/2001 |
| 6184628 | Multicolor led lamp bulb for underwater pool lights A multicolor LED lamp bulb includes a hollow lamp body which has a substantially tapered intermediate portion, a longitudinal portion and a stem portion, a lens sealingly engaged with the longitudinal portion, a plurality of different colored LED bulbs mo... | 02/06/2001 |
| 6127787 | Sequential, clamped, single-ended ignition of series operation arc lamps A series of arc lamps is ignited sequentially while maintaining a specified voltage on one side of each lamp with dielectric insulation on the high voltage side.... | 10/03/2000 |
| 5955845 | High pressure series arc discharge lamp construction with simplified starting aid A high pressure sodium discharge lamp includes first and second discharge devices electrically connected in series within an outer envelope. The discharge devices each include a discharge vessel enclosing a discharge space with an ionizable fill and first... | 09/21/1999 |
| 5898274 | Integrated starter and regulator for fluorescent tubes A control and starting device for fluorescent tubes powered by an electrical circuit via two electrodes, the device includes a loaded polymer part provided adjacent to the tube and used as a ballast providing starting and proper operation control function... | 04/27/1999 |
| 5561346 | LED lamp construction An improved LED lamp construction is disclosed having a plurality of LEDs electrically interconnected and mounted upon opposed rounded surfaces formed at one end of the lamp body. The opposed rounded surfaces comprise a substantially semi-spherical lamp h... | 10/01/1996 |
| 5345164 | Power factor corrected DC power supply An improved power factor DC power supply in accordance with the present invention (100 or 200) employs a power factor correcting network ( 120), a full-wave rectifier means (122), a pair of filter capacitors (124 and 126 ) , and three current steering dio... | 09/06/1994 |
| 5220247 | Circuit for driving a gas discharge lamp load For driving gas discharge lamps (102, 104) having heatable filaments (102A, 102B, 104A, 104B), a circuit (100) has an inverter (132, 134) and a series-resonant LC oscillator (150, 158, 170) forming a self-oscillating inverter. The oscillator output provid... | 06/15/1993 |
| 5214355 | Instant-start electronic ballast A half-bridge inverter is powered from a constant-magnitude DC supply voltage and provides at the inverter's output a first AC output voltage that is describable as a modified squarewave voltage. This first AC voltage is applied across a series-combinatio... | 05/25/1993 |
| 5173643 | Circuit for dimming compact fluorescent lamps A dimming control circuit provides power from an ac source to a compact fluorescent lamp. The circuit generally includes a resonant half-bridge inverter driven by a pulse-duration-modulated voltage, for providing a high-frequency ac voltage between the la... | 12/22/1992 |
| 5150016 | LED light source with easily adjustable luminous energy An LED light source with readily adjustable luminous energy including LED chips is disclosed. A resistor device is provided in order to control the current flowing in LED chips for reducing variance of luminous energy. The resistor device includes a plura... | 09/22/1992 |
| 5028845 | High-pressure series arc discharge lamp construction A 1000 watt arc discharge arc tube assembly comprises two series connected side-by-side arc discharge tubes whose combined break down voltage in sufficient for a standard 2-5 kv starting pulse to simultaneously start both arc tubes without additional stru... | 07/02/1991 |
| 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 |
| 4754201 | Magnetic low load factor series ballast circuit A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core a... | 06/28/1988 |
| 4751432 | High-pressure discharge lamp The invention relates to a high-pressure discharge lamp comprising an outer bulb accommodating a first and a second discharge vessel, these discharge vessels being connected electrically in series. According to the invention, the second discharge vessel i... | 06/14/1988 |
| 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 |
| 4467247 | High frequency fluorescent lamp circuit A high frequency fluorescent lamp circuit for operating two or more fluorescent lamps connected in electrical series. A capacitor is connected between one end of the series-connected lamps and electrical ground and/or an electrically conductive fixture fo... | 08/21/1984 |
| 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 |
| 4396868 | Lamp circuit with disconnected lamp detecting device A lamp circuit is provided having a constant current-type AC power source and a plurality of isolation transformers coupled in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The outpu... | 08/02/1983 |
| 4396865 | Therminoic fault current limiter and method of current limiting A thermionic fault current limiter utilizes either a vacuum or plasma environment for a plurality of spaced conduction electrodes. The electrode can be supported by insulative spacers with the electrode providing shadow shields for the supporting spacers.... | 08/02/1983 |
| 4348614 | Non-light producing substitute apparatus for use in place of phosphor excitable lamps A non-light producing substitute apparatus for use as a replacement for a phosphor energizable lamp in an arrangement where a plurality of such lamps are connected in a series electrical circuit. Typically, two or more phosphor energizable lamps, such as ... | 09/07/1982 |
| 4339690 | Energy saving fluorescent lighting system Energy-saving circuitry for a rapid-start fluorescent lighting system includes a reactance-modifying capacitor coupled in series with first and second fluorescent lamps and includes a filament switch which is operative to conduct filament heating current ... | 07/13/1982 |
