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| Number | Title | Issue Date |
| 7372369 | Monitoring of alarm system wiring A supervisory method and apparatus provide for detection of “partial fault” conditions such as a relatively high series impedance in the wiring, or a relatively low parallel impedance across the wiring. A non-linear element, such as a semiconductor diode, can be... | 05/13/2008 |
| 7312715 | Management of large scale cabling systems Method and system for managing cabling rooms that include a plurality of communication panels, which are arranged closely to one another. Each cabling room has a plurality of patch panels, structurally connected to form vertical structures. An operator is automatica... | 12/25/2007 |
| 7168797 | Ink container An ink container includes an ink container body and a memory attached to the ink container body for storing predetermined information. The memory is bonded to a part of the surface of the ink container body at its surface opposed to the surface of the ink container ... | 01/30/2007 |
| 7168974 | Three phase lighted plugs and connectors for indicating the absence of at least one phase Indicator means located in a plug or connector indicates when at least one phase of an AC multi-phase voltage is absent. The indicator means can be any one of a variety of light sources and/or an audible generator. The light source can be, for example, an LED, an il... | 01/30/2007 |
| 7102356 | Electrical leakage detection circuit A method is provided for detecting electrical leakage between a power supply and a frame of a vehicle or machine. The disclosed method includes coupling a first capacitor between a frame and a first terminal of a power supply for a predetermined period of time. The ... | 09/05/2006 |
| 7081808 | Self-registration systems and methods for dynamically updating information related to a network Self-registration systems and methods for dynamically updating information related to a network, are provided. A self-registration system for dynamically updating information related to a network, comprises: a connector comprising an integrated circuit that stores a... | 07/25/2006 |
| 7046157 | Short circuit detector for shield conductor in a fieldbus network A short circuit detector for a fieldbus network which includes power/data wires that are typically positive and negative, respectively, and a shield conductor connected to a ground includes first and second high-impedance semiconductor circuits coupled between each ... | 05/16/2006 |
| 6483435 | Method and device of fault location for distribution networks The present invention relates to a method for location of a fault which has occurred on one of a plurality of lines in a power distribution network where the location is performed with the measured values of the common supply voltage of the plurality of l... | 11/19/2002 |
| 6449249 | Spare circuit switching Active and spare circuit cards are each paired with switch cards. Each switch on the switch cards is daisy chained with prior and succeeding switches. A master controller senses a faulty circuit indication signal from each of the active circuit cards. Whe... | 09/10/2002 |
| 6307476 | Smart binary switch for use with an electronic patient monitor This invention relates generally to monitoring systems and more particularly concerns devices and systems used to monitor bed patients in hospital or other care-giving environments. In accordance with a first aspect of the instant invention, there is prov... | 10/23/2001 |
| 6249230 | Ground fault location system and ground fault detector therefor A ground fault location system is used in a multi-phase ungrounded or high-impedance grounded power network. A signal generator is coupled to the network at a first location and generates for each network phase an individual non-DC voltage signal between ... | 06/19/2001 |
| 6246225 | Apparatus for detecting a completed electrical circuit and testing an electrical output receptacle A self-contained unit intended primarily for tracing the circuit connection between an electrical outlet or lighting receptacle and its corresponding circuit-breaker. The preferred embodiment includes a housing, a male two prong electrical plug, and a sou... | 06/12/2001 |
| 6222374 | Wiring harness diagnostic system A circuit includes a plurality of inexpensive resistors connected at one end to the open collector outputs of an output array of NPN output transistors which are connected to a wiring harness or the like for selectively powering a preselected load. The op... | 04/24/2001 |
| 6201479 | Switching arrangement for monitoring leakage current A circuit arrangement for monitoring leakage currents of a circuit which includes a plurality of valve coils connected in parallel to a supply line and adapted to be connected to ground by way of individual switches, and wherein the supply line is connect... | 03/13/2001 |
| 6157308 | Detecting hidden faults in reliable power systems A method and apparatus for detecting silent faults in feeding diodes of redundant DC power supplies. The voltages on both sides of the feeding diodes are measured. Arrangements are then made to ensure that if corresponding feeding diodes are both operativ... | 12/05/2000 |
| 6144305 | Electronic apparatus An electronic apparatus is provided that can eliminate unlawful cartridges while preventing a malfunction by checking whether there is a short-circuit of pin terminals at the time of turning on the power source and conducting further improved security che... | 11/07/2000 |
| 6008730 | Sound warning circuit for PCI hot plug A sound warning circuit for PCI hot plug basically comprises: a timer that takes as inputs a fixed frequency clock and the system port B's bit 0, and which controls the system; a logic AND gate that takes as inputs the timer output and the system port B's... | 12/28/1999 |
| 6002338 | Method and system for detecting failures in self-exciting sensor A method and system for detecting faults with a self-exciting sensor includes a monitor circuit coupled to the self-exciting sensor for monitoring a signal associated with the sensor and generating a failure signal. A voltage limiting circuit is coupled t... | 12/14/1999 |
| 5990685 | Apparatus for and method of monitoring an earth-leakage state of a power distribution system An earth-leakage monitoring method for a power distribution system, and in particular a DC 4-rail traction system, incorporating a pair of current-conductors (current rails) and an earth reference (a pair of running rails or an earthing system), comprises... | 11/23/1999 |
| 5825599 | Ground fault circuit interrupter system with uncommitted contacts A ground fault circuit interrupt system with uncommitted contacts is provided which includes line-side system, phase, neutral and ground terminals electrically connectable to phase, neutral and ground terminals of an AC power source and load-side system, ... | 10/20/1998 |
| 5617033 | Method and apparatus for electrically testing multi-core cable A plurality of cores of a multi-core cable are collectively conducted at first ends side thereof and are isolated from one another at second ends side thereof. The cores are engaged at the first ends side with grooves formed on a movable member one by one... | 04/01/1997 |
| 5614889 | Apparatus and methods for coupling a case of an electric appliance to an external ground and for detecting leakage current The apparatus for automatically coupling an internal ground of an electric appliance to an external ground, comprises first and second AC power lines for supplying an AC input to a load; a neutral ground generating circuit for combining the first and the ... | 03/25/1997 |
| 5551485 | False warp stop diagnostic apparatus A diagnostic device for testing a false warp stop in an industrial loom caused by a failing or offending drop wire. The device provides a connector that is operably engaged with the warp bars of an industrial loom. When a drop wire becomes worn or pliable... | 09/03/1996 |
| 5550476 | Fault sensor device with radio transceiver A fault sensor device which can detect and distinguish abnormal current and voltage events on an alternating current overhead and underground power transmission or distribution line. The abnormal current events are momentary outage, sustained outage, norm... | 08/27/1996 |
| 5424895 | Electrical wiring system with overtemperature protection A household electrical service (10) is protected against overheating by running a sensor line or wire (36 or 38), coextensively together with hot, neutral and ground lines or wires (12, 13, 14 or 31, 32, 33), from a power company hookup (50) to a main bre... | 06/13/1995 |
| 5250909 | Automatic fault detection system in electrical sensing circuit An electrical sensing circuit has a sensor device and an indicator such as a warning light. The system of the present invention continuously monitors the operational status of the sensing circuit. Normally open sensors are provided with a resistance acros... | 10/05/1993 |
| 5229725 | Electrical fault detector in remote systems using a saturable core Imbalances between currents to and from a remote point are detected by passing the outgoing currents and the return current through different, oppositely-oriented coils on a saturable core, and an excitation current is applied to another coil in the same ... | 07/20/1993 |
| 5005007 | Alarm device for marine tank An alarm device adapted particularly for the indication of electrical leakage and mal-insulation of electrical appliances disposed in association with a marine tank for use in fish raising. An electrical leakage sensor unit is provided in the tank, to whi... | 04/02/1991 |
| 4975685 | Guide path short detector To detect a short circuit condition between guide paths embedded in the floor for automatic guided vehicles, a detection relay has a pair of current transformers having primary windings connected into a guide path circuit at points on the source and the r... | 12/04/1990 |
| 4959792 | Harness integrity tester (hit) A method and apparatus for determining the conductive integrity of a plurality of lines which transmit electromagnetic radiation.... | 09/25/1990 |
| 4929901 | DC ground fault detection Apparatus for the detection of ground leakage in a normally ungrounded DC system includes a DC power supply and conductors from the supply for supplying power to a load connected to the DC system. There is an indicator connected between the DC system and ... | 05/29/1990 |
| 4896140 | Display table security system A control module is connected to a table strip having a number of jacks. A sensor probe which consists of a sensor detector and a sensor cable has at the end of the cable a plug which is connected to the table strip jack. Each sensor cable is provided wit... | 01/23/1990 |
| 4884034 | Ground fault detector and locator A ground fault detector and locator for use in servicing ungrounded d-c or a-c power distribution systems. A pulsating ground current is introduced between the unfaulted side of the distribution system and earth ground. A current probe and associated sens... | 11/28/1989 |
| 4881072 | Device for remote metering A device for remote metering, comprising a meter (4) for measuring a consumption, a transmission circuit for transmitting information relating to quantities consumed, and consisting essentially of a modulating circuit (5,6) and of a bifilar line (3), and ... | 11/14/1989 |
| 4689551 | Testing wiring harnesses Apparatus for testing wiring harnesses either during or after the harness fabrication process comprises test points, each of which is connected to a corresponding terminal of the harness. Associated with the test points are a current source, a current sou... | 08/25/1987 |
| 4542372 | Data distribution apparatus A data distribution apparatus for controlling the distribution of data signals from field mounted devices to a central processor includes a backplate having wiring connected thereto between the backplate and the field mounted devices and between the backp... | 09/17/1985 |
| 4528497 | Method and apparatus for monitoring ground faults in isolated electrical systems A device for monitoring ungrounded power distribution systems that indicates the total hazard current from the isolated power conductors to ground. A measurement signal having at least two frequency components different from the power system line frequenc... | 07/09/1985 |
| 4506260 | Ground assurance circuit A bi-directional system for ensuring that a ground connection is made in a three-wire conductor system including a line "hot" conductor, a line neutral conductor, and a ground conductor includes a circuit for generating direct current potential related to... | 03/19/1985 |
| 4432517 | Circuit for detecting unbalance of the traction current in a track circuit In order to prevent a false signal being given in a circuit arrangement for detecting the presence of rolling stock on a track section, when a rail is grounded or fractured, a detecting circuit (31) is provided for detecting unbalance of the traction curr... | 02/21/1984 |
| 4414543 | Ground fault indicator A ground fault indicator for a multi-phase power distribution system includes a split-core magnetic pole assembly having a gap within which is developed a magnetic flux representative of the vector sum of the currents in the individual phase conductors of... | 11/08/1983 |
