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| Number | Title | Issue Date |
| 7425798 | Intelligent light degradation sensing LED traffic signal The inventive signal incorporates an intelligent diagnosis module inside a light emitting diode (LED) signal, such as an LED traffic signal. The inventive signal can self-extinguish or send a signal through its communication port at the end of its useful life when t... | 09/16/2008 |
| 7394203 | Method and system for open lamp protection A detector circuit monitors the phase relationship between the lamp voltage and the excitation voltage, and if one or more conditions are met, triggers the open lamp protection process in a discharge lamp system. The detection circuit can be incorporated into a lamp... | 07/01/2008 |
| 7294971 | Balancing transformers for ring balancer A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondar... | 11/13/2007 |
| 7268497 | Lighting device with night light and human body sensing capability A lighting device with night light and human body sensing capability includes a first illumination device, a second illumination device, a sensor and a main body. The first illumination device is designed to illuminate a local predetermined area, and the second illu... | 09/11/2007 |
| 7250731 | Primary side current balancing scheme for multiple CCF lamp operation A backlight system drives multiple lamps using balanced groups of serially-connected lamp transformers. A plurality of lamp transformers is divided into multiple transformer groups. Primary windings of the lamp transformers are coupled in series in each transformer ... | 07/31/2007 |
| 7242147 | Current sharing scheme for multiple CCF lamp operation A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondar... | 07/10/2007 |
| 7238326 | Germicidal treatment system with status indicator There is disclosed a germicidal treatment system having a status indicator. The germicidal treatment system comprises at least one mounting assembly attachable to an outside of a wall of an air handling apparatus. Each of the mounting assemblies includes a germicida... | 07/03/2007 |
| 7218057 | PAPI 1 style B combination lamp bypass and tilt switch and control system A Style B PAPI system comprises a plurality of identical lamp housing assemblies, each with one or more lamps and each housing assembly including: an electronic bypass circuit with first and second oppositely poled SCRs coupled across the terminals of each lamp; a z... | 05/15/2007 |
| 7190120 | Airport strobe light monitoring system An airport strobe lighting system includes a BCD source of pulses generating trigger voltages for a plurality of strobe lamps and a sensor circuit for comparing confirmation signals with the trigger pulses and generating corresponding return pulses indicative of the... | 03/13/2007 |
| 7124220 | Sequencer device with automated active port detection and sequencing The technique is disclosed for detecting active ports of an electronic device. The electronic device comprises a plurality of ports, including a first port. A determination is automatically performed as to whether an external component is connected to the first port... | 10/17/2006 |
| 7102540 | Remote access of an airport airfield lighting system Remote monitor and control of an airfield lighting system. A processing system local to the airport is provided in communication with the airfield lighting system for monitor and control thereof, the airfield lighting system producing airfield information for proces... | 09/05/2006 |
| 7068188 | Runway approach lighting system and method A method and system for visually guiding an aircraft in its landing approach to a runway having an approach area equipped with approach lights operable in off, low, medium, and high intensity states. The lights are communicated with a secondary side of a transformer... | 06/27/2006 |
| 6965203 | Method and circuit for repetitively firing a flash lamp or the like Disclosed is a method and circuit for repetitively firing a flash lamp. The method utilizes a power supply having a periodic voltage signal. The method times the discharge of the flash lamp to occur when the power supply signal is below the flash lamp self extinguis... | 11/15/2005 |
| 6963170 | Lamp monitor and lamp The present invention discloses a lamp comprising a lamp housing mounting an electrically driven light and a monitor circuit, the housing having power supply terminals for connection of the light to a power supply and the monitor being connected to the light such as... | 11/08/2005 |
| 6936969 | Secondary vehicle headlight system A secondary headlight system for detecting and compensating for failure of an automotive vehicle's low beam headlight, includes: (a) at least one photoresistor; (b) fiberoptics connected to the photoresistor; ... | 08/30/2005 |
| 6917164 | Light signaling device related to the operating state of a system A light signaling device related to the operating state of a system has at least one light and circuits of detection of a failure of this or these lights, in which each light comprises m branches in parallel each composed of n light emitting diodes in series, and a ... | 07/12/2005 |
| 6911777 | Clamp-on low power isolation transformer for airfield lighting A clamp-on isolation transformer for an airfield lighting fixture in an airfield lighting system includes a first portion configured to receive a portion of a primary conductor of a primary current loop and a second portion configured to receive another portion of t... | 06/28/2005 |
| 6909248 | Deuterium arc lamp assembly with an elapsed time indicator system and a method thereof A lamp system includes a light source and an elapsed time indicator system which is coupled to the light source. The elapsed time indicator system accumulates a count of elapsed time of operation of the lamp system. The count provides an indication of a life span of... | 06/21/2005 |
| 6885297 | Process for management of a light signaling device, and a device using this process, particularly for avionics This invention relates to a process for management of a light signaling device related to the operating state of a system comprising several lights each comprising several branches of several light elements, that includes a step for dynamic management of redundancy ... | 04/26/2005 |
| 6762563 | Module for powering and monitoring light-emitting diodes LED lamp circuitry that emulates an incandescent lamp's behavior upon remote verification of the LED lamp. The LED lamp circuitry presents an input power switch circuit, a fuse blow-out circuit and a cold filament detection circuit permitting the use of LED lamps in... | 07/13/2004 |
| 6717660 | System for monitoring and testing of light sources A light monitoring system provides a sensing unit coupled to a luminaire. The sensing unit monitors both the input and the output of the luminaire for both current and voltage. In this manner, a variety of problems with the luminaire can be detected by the sensor an... | 04/06/2004 |
| 6664736 | Method and system for indicating bulb circuit failure A method of monitoring faults in a vehicle bulb circuit including bulb and a fuse. The method includes detecting acceleration of the vehicle and comparing the acceleration of the vehicle to a limit. Based on the relationship of the acceleration to the lim... | 12/16/2003 |
| 6504485 | Monitoring apparatus and control apparatus for traffic signal lights Monitoring and control apparatus for fail-safe monitoring for normal operation of traffic signal lights provided at an intersection or the like where a plurality of roads intersect. The illumination conditions of respective signal lights are detected usin... | 01/07/2003 |
| 6448716 | Solid state light with self diagnostics and predictive failure analysis mechanisms A solid state light apparatus ideally suited for use in traffic control signals having a Self Diagnostic/Predictive Failure Analysis (SD/PFA) function facilitating a real time status of the signal as well as prediction of failure years in advance of the a... | 09/10/2002 |
| 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 |
| 6184799 | Monitoring apparatus and control apparatus for traffic signal lights Monitoring and control apparatus for fail-safe monitoring for normal operation of traffic signal lights provided at an intersection or the like where a plurality of roads intersect. The illumination conditions of respective signal lights are detected usin... | 02/06/2001 |
| 6078257 | Current detector flood light lamp removal alarm A flood light lamp removal alarm for security lights mounted on or near a home, wherein the lights are designed to turn on automatically if a motion detector is triggered and the ambient light level is low, detects by a current if any of the flood light l... | 06/20/2000 |
| 5969642 | Airfield lighting system A microprocessor-controlled airfield lighting control and monitoring system having bi-directional communication between the controlling microprocessor and the airfield lights and/or sensors. The system also includes a metal container for the remote contro... | 10/19/1999 |
| 5955844 | Smart logic switching uninterruptible power source An uninterruptible power source for emergency lighting in an AC powered electrical system utilizes X-10 protocol transmitters and receivers for transmitting and receiving data signals over existing wiring to emergency wall switches interposed in the wirin... | 09/21/1999 |
| 5926115 | Airfield series circuit communications lighting system and method A microprocessor-controlled airfield series lighting circuit communications system and method allows bi-directional communication between the controlling microprocessor and the airfield lamps. The bi-directional communications signals are formed by using ... | 07/20/1999 |
| 5644304 | Automatic control system of lights in a series circuit illumination plant, in particular lights for airport signalling An automatic control system for a series circuit, in particular for airport signaling lights, physically separated from the work circuit feeding the lights and galvanically separated from the latter, includes a computer; several Main Stations each contain... | 07/01/1997 |
| 5638057 | Ground fault detection and measurement system for airfield lighting system The present invention includes an airfield lighting and control system for energizing at least one airfield control device and containing a ground fault detection system, comprising: (1) at least one airfield control device; (2) an AC electrical circuit c... | 06/10/1997 |
| 5625260 | Systems and methods for transmitting pulse signals The invention relates to a method and system for communicating from the secondary side of an isolation transformer (6) to receiver means, the primary of said transformer being connected via a power cable to a circuit fed with a periodic voltage from a con... | 04/29/1997 |
| 5485151 | Airfield lighting system A microprocessor-controlled airfield lighting control and monitoring system having bi-directional communication between the controlling microprocessor and the airfield lights and/or sensors. The system also includes a metal container for the remote contro... | 01/16/1996 |
| 5426429 | Supervision and control of airport lighting and ground movements In an arrangement for supervising and controlling field light units (20) at an airport, a regulator provided with a monitoring unit for power supply and for monitoring the light units is arranged individually for each light unit (18,20) to regulate the li... | 06/20/1995 |
| 5397963 | Subsystem and method for detecting lamp failure A dual mode high intensity aircraft approach lighting system includes a plurality of lights interconnected by means of power wiring. An improved subsystem for detecting lamp failures is disclosed which permits a positive identification of individual faile... | 03/14/1995 |
| 5387909 | Lamp sensing system for traffic lights A method and apparatus for determining the presence of a burned out lamp of a traffic signal is disclosed. The current applied to one or more banks of traffic signals and the voltage applied across such traffic signal banks are measured simultaneously. An... | 02/07/1995 |
| 5359325 | Automatic monitoring system for airfield lighting systems A runway lighting system comprises a series runway transmission line providing current to a plurality of runway lamps. A failed lamp indicator (FLI) connects across the terminals of each lamp to determine when the lamp is malfunctioning. When the FLI dete... | 10/25/1994 |
| 5248967 | Method and apparatus for monitoring electrical devices The condition of signal lamps (R1, R2) in a traffic light system is monitored by compiling a table of power consumption levels at different levels of applied voltage. The table is then used to adjust measured levels of power consumption at intervals durin... | 09/28/1993 |
| 5243340 | Supervision and control of airport lighting and ground movements In an arrangement for supervising and controlling field light units (20) at an airport, a regulator provided with a monitoring unit for power supply and for monitoring the light units is arranged individually for each light unit (18,20) to regulate the li... | 09/07/1993 |
