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| Number | Title | Issue Date |
| 7333903 | Light management system having networked intelligent luminaire managers with enhanced diagnostics capabilities A network operation center for a light management system having networked intelligent luminaire managers. A plurality of networked luminaire managers, each collocated with a respective luminaire, monitor the status of their respective luminaires. The luminaire manag... | 02/19/2008 |
| 7312695 | Apparatus and method for displaying operating characteristics on status indicators A user interface for a load control device allows a user to control an operating characteristic of a load to a plurality of discrete levels. The user interface comprises an adjustment member for allowing the user to select one of the discrete levels and a linear arr... | 12/25/2007 |
| 6967445 | Circuit continuity and function monitor A circuit to monitor electrical continuity through a light bulb when the light bulb is switched off, and to monitor proper functioning of the light bulb when the bulb is switched on. The circuit comprises a LED, a relay and a latching circuit portion, the latching c... | 11/22/2005 |
| 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 |
| 6897787 | Method and apparatus for composing an illumination pattern A method and apparatus for composing an illumination pattern includes a user interface (102) capable of receiving input commands (106), wherein the input commands (106) are directed to the selection of at least one illumination region (148, 1... | 05/24/2005 |
| 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 |
| 6803727 | Light system for use especially by operating theatre A lighting system, preferably for use in operating theatres, in which at least one light source is mounted to be movable an adjustable in a single ceiling and/or wall element in the form of a prefabricated module element (4). The light sources in each module ... | 10/12/2004 |
| 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 |
| 6717367 | Emergency lighting arrangement and apparatus An emergency lighting arrangement and an emergency lighting apparatus, the arrangement being configured to be coupled to a supply network and the arrangement comprising an electronic ballast for igniting and burning a fluorescent lamp, the emergency lighting apparat... | 04/06/2004 |
| 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 |
| 6426593 | Method and apparatus for illuminating two dependent indicators with a single output pin A display apparatus for selectively controlling the illumination of two dependent visual indicators with a single control line. The apparatus includes two visual indicators, two amplifiers, and a logic circuit. The same end of the two visual indicators co... | 07/30/2002 |
| 6246186 | Method and apparatus for controlling two independent visual indicators with a single output pin A display apparatus for selectively and independently controlling the illumination of two diode indicator lights with a single control line. The apparatus includes first and second diode indicator means connected in parallel with one another, with the cat... | 06/12/2001 |
| 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 |
| 5578998 | Method and apparatus for predicting of lamp failure A method and apparatus for identifying electric lamps likely to fail due to a violated internal atmosphere monitor voltage through a resistor in order to ascertain a increasing internal resistance of the lamp. The apparatus of the present invention prefer... | 11/26/1996 |
| 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 |
| 5266840 | Circuit for detecting the failure of a load which is connected in series with an electronic switch A circuit for detecting the non-operating condition of a load which is connected in series with an electronic switch wherein a comparator has a first input which is connected to the junction point between the load and the electronic switch and has a secon... | 11/30/1993 |
| 5168198 | Lamplight failure detection system A lamplight failure detection system for detecting lamplight failure in a lamplight circuit, the lamplight circuit having a plurality of lamplight units connected with the secondary side circuits of each of a plurality of current transformers, the current... | 12/01/1992 |
| 5099177 | Lamp circuit with disconnected lamp detecting device A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal ... | 03/24/1992 |
| 5034659 | Lamp circuit with disconnected lamp detecting device In a series lamp circuit designed to connect lamps to the secondary windings of current transformers connected in series with a constant-current power supply, the series lamp circuit provides a disconnected lamp detecting means and a short-circuit switch ... | 07/23/1991 |
| 4977353 | Communication system for single point emergency lighting An emergency lighting system comprising a central monitoring and control unit, a plurality of single point lighting units and a communication system linking all of these units and being configured with a loop topology. Addressing of single point units aro... | 12/11/1990 |
| 4945280 | Independent emergency lighting system with self-diagnosis An emergency lighting system of an advanced type which, through the use of an appropriate microprocessor, can be used to check the recharging current and voltage of the batteries and detect faults in the circuit and the fluorescent or incandescent lamps, ... | 07/31/1990 |
| 4767968 | System for controlling the operation of electrically powered apparatus The preferred embodiment of the present invention provides a control system which permits operation of electrically powered apparatus in any one of several active modes from a controller mounted remotely from the apparatus. The system is particularly usef... | 08/30/1988 |
| 4691143 | Circuit status indicating device with improved switch on/off detection capability A circuit status indicating device is used to monitor separate circuits to indicate their on/off status. Each circuit conducts an AC operating signal when switched to "on" status and an AC non-operating signal when switched to "off" status. The AC non-ope... | 09/01/1987 |
| 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 |
| 4138627 | Current-level-sensitive switching system A solid-state switching system which produces one or more switching signals in response to a power circuit current's reaching a preset level or levels whereby remote control of associated apparatus may be effected without independent control circuits.... | 02/06/1979 |
| 4104560 | Lighting system for a motor vehicle A voltage detecting means, such as a voltage winding, a zener diode or the like, is connected across a power source and is operative when the voltage applied thereto exceeds a predetermined value owing to a disconnection of a main lamp also connected acro... | 08/01/1978 |
| 4017847 | Luminous indicator with zero standby power In a luminous indicator circuit, a plurality of luminous elements are connected in series relation to form a series circuit which is supplied through a constant current device. A solid state switching device is placed in parallel with each luminous elemen... | 04/12/1977 |
| 3952229 | Display device having signal lamps In a display device having a plurality of signal lamps, each lamp is coupled to a signal contact through a first decoupling diode and a test voltage having a voltage lower than that of the signal voltage is coupled to each lamp by means of a series resist... | 04/20/1976 |
