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| Number | Title | Issue Date |
| 7750816 | Surge current alarm circuit An exemplary surge current alarm circuit includes a detecting circuit to detect a surge current and convert the surge current into a digital signal with a pulse width corresponding to a duration of an over value part of the surge current when the surge current is ov... | 07/06/2010 |
| 7453368 | Surge protector life cycle monitor system and method A system and method are provided for determining an expected life of an electric surge protection component. The system and method monitors preferably each surge that an electric surge protection component experiences. Each surge is measured to determine magnitude a... | 11/18/2008 |
| 7401007 | Method, computer program and apparatus for extracting large size signal data samples with an automatically adjusted decimation ratio A method for rapidly extracting data file samples with an a signal monitor and an automatically adjusted decimation ratio is provided to solve the long-standing problems caused by large data files and small buffers by reducing a large data segment to a smaller, more... | 07/15/2008 |
| 7373574 | Semiconductor testing apparatus and method of testing semiconductor A semiconductor testing apparatus, includes a test signal generating unit that generates a test signal corresponding to a test pattern to output the generated test signal to a device under test (DUT); a comparison signal generating unit that generates a comparison s... | 05/13/2008 |
| 7242291 | Arc fault circuit interrupter test circuit and test board A tester for an arc fault circuit interrupter that can selectively simulate and apply electrical arc faults and nuisance loads to at least one device under test (DUT). The tester includes a power supply, a test controller, and test circuitry coupleable to a DUT. AC ... | 07/10/2007 |
| 7183902 | Very local area network (VLAN) A Very Local Area Network (VLAN) comprises a power strip device having an electrical connector for connection to an AC power supply line and one or more surge protectors and line filters. Multiple electrical power outlet sockets receive plugs from electrical applian... | 02/27/2007 |
| 7157944 | Differential signal detector methods and apparatus Circuitry and methods allow signal detection based entirely on differential voltage pairs. An incoming differential data signal is processed by separate full-wave rectifiers to extract high and low peak voltage envelopes. The rectifiers utilize negative feedback to ... | 01/02/2007 |
| 7158041 | Electrical protection device and method for a communication circuit A protection device for a communication circuit that includes a sensor monitoring a protection device parameter and an indication module coupled to the sensor. The indication module generates an indication output as a function of the protection device parameter indi... | 01/02/2007 |
| 7142400 | Method and apparatus for recovery from power supply transient stress conditions A method for recovery from overstress conditions, comprising the steps of (A) detecting an overstress event, (B) storing an occurrence of the overstress event and (C) taking appropriate action in response to the stored occurrence of the overstress event. ... | 11/28/2006 |
| 7023680 | Transient voltage protection and ground status monitoring apparatus and method In accordance with the present invention, a method is provided whereby the transient voltages presented at the input to a watt-hour meter are suppressed to prevent damage to the watt-hour meter and to the electronic devices that are powered through the watt-hour met... | 04/04/2006 |
| 6975312 | Computer system having network connector and method of checking connection state of network cable therefor A computer system having a network connector to which a network cable is connected, including a displaying part displaying a connection state of the network cable; a signal processing part processing a signal inputted through the network connector; and a control par... | 12/13/2005 |
| 6932624 | Modular signal and power connection device An electrical connection box for wall mounting provides a recessed external plug for receiving or transmitting power to electronic components. The connection box is configured to receive a variety of signal connection modules for interconnecting associated audio/vis... | 08/23/2005 |
| 6922059 | Electric field sensor The invention is a detection system and in one embodiment uses inexpensive, miniaturized sensors for detecting electric field (E-field) disturbances. Such sensors are easily and covertly deployable and have low power consumption. The devices may incorporate visual o... | 07/26/2005 |
| 6888454 | Fault diagnosis circuit for LED indicating light A fault diagnosis circuit of the present invention includes: LED indicating units 3a, 3b, and so forth; current detecting circuits R1 and Q1 for detecting a flowing current by flowing a short-time pulse of a current through ... | 05/03/2005 |
| 6815107 | Gas leak detection method for fuel cell In order to improve detecting accuracy in a gas leak detection for a fuel cell, in a gas leak detection method for a fuel cell having a solid polymer electrolyte membrane sandwiched by an anode and a cathode, an output voltage is measured in an activated over-potent... | 11/09/2004 |
| 6771178 | Method of identifying actuators in a motor-vehicle air-conditioning installation A flap to be identified is caused to move over the whole of its angular range of travel. The number of motor steps is counted during this movement, and the number of steps counted is compared with at least one pre-recorded information item corresponding to a particu... | 08/03/2004 |
| 6703938 | Electrical panel safety monitor An electrical safety monitor (20) includes a housing (50) with a display face (70) and a securing section (54) that connects with an electrical panel (62). Electrical circuitry (30) is contained in the housing (50). The electrical circuitry (30) communica... | 03/09/2004 |
| 6690283 | Protective device and communication device An apparatus to indicate a state where a communication device connected to a communication wire and a power line is protected from a surge current. A toroidal coil picks up a rapid increase of current caused by a rapid increase of voltage that occurs in t... | 02/10/2004 |
| 6650245 | Multi-functional hybrid contactor A multi-functional hybrid contactor has a motor protection function against an abnormal state in addition to the starting, running and stopping of the motor, the same effect as the case that an electronic motor protection relay (EMPR) is connected in para... | 11/18/2003 |
| 6646561 | Method and device for in-use detecting low cranking strength of a combustion engine battery during engine starting A method and device for in-use detecting low cranking strength of a combustion engine battery during engine starting, based on integrating changes in battery voltage specifically during engine starting, from the time the electro-mechanical starting load i... | 11/11/2003 |
| 6407672 | Adaptive CPU cooling fan speed monitor device A device is provided which allows a personal computer user to monitor the operational parameters of the central processing unit's cooling fan. This device, called the CPU cooling fan speed monitor, characterizes the normal operating speed range of the CPU... | 06/18/2002 |
| 6400258 | Electric arc monitoring systems Systems of monitoring electric arcs substantially eliminate alternating current fundamentals and harmonics from monitored arc signatures. Such systems phase shift, delay or otherwise store a representation of the alternating current fundamental and harmon... | 06/04/2002 |
| 6259371 | Power surge detection device A power surge detection device is disclosed to investigate if there is any power surge occurring to a main processor in a computer system. When the width or frequency of power surges detected jeopardize the normal operation of the computer system, an aler... | 07/10/2001 |
| 6087948 | Encoder A method of establishing a state of an encoder, and an encoder having a state assessment device that includes the steps of generating at least one analogue signal whose amplitude is changed in response to movement between an encoding disc and a detector, ... | 07/11/2000 |
| 6034611 | Electrical isolation device An electrical isolation device for use in an electrical distribution network having a plurality of branch circuits each defined by line and neutral conductors connected between a power source and a load, the line conductor being electrically connected to ... | 03/07/2000 |
| 5923517 | Transient voltage surge suppressor with a reversible on-off switch assembly A transient voltage surge suppressor (TVSS) receptacle includes front and rear matable casings including a plurality of through openings for receiving the blades of an electrical plug; an electrical circuit within the receptacle having at least one elemen... | 07/13/1999 |
| 5877630 | System and method for protecting an electronic device from electromagnetic radiation interference A system for protecting an electronic device from electromagnetic radiation is provided that receives electromagnetic radiation impinging on said electronic device, determines a value of a characteristic of said electromagnetic radiation, generates a test... | 03/02/1999 |
| 5856803 | Method and apparatus for detecting radio-frequency weapon use An apparatus for detecting abnormal radio-frequency signals has an antenna responsive to a radio-frequency signal. The radio frequency signal has a plurality of signal components, each of which has an associated amplitude. A circuit attenuates each of the... | 01/05/1999 |
| 5790039 | Method for detecting the presence of a spark in an electronic ignition system used with an internal combustion engine A method for detecting the presence of a spark in an electronic ignition system. The method consists of generating an overvoltage event and then generating a voltage signal proportional to the overvoltage event. The onset of the overvoltage event is detec... | 08/04/1998 |
| 5768342 | Telephone system loop current detector A current detector for connection in series with a lead carrying current to be detected, has a first branch with a plurality of series connected diodes having an anode end and a cathode end for connection to the lead, a first optocoupler light emitting di... | 06/16/1998 |
| 5748093 | Electrical surge protection system with condition monitoring A surge protection system having a plurality of surge protection devices for the protection of a power line. Each of the surge protection devices may be in either a ready state in which the surge protection device provides surge protection or an inoperabl... | 05/05/1998 |
| 5684465 | Method and means for supervision of valve units The invention relates to a method for supervising the functioning of a plurality of valve units, a system for performing the method, a control unit and a control assembly for cooperation with the control unit. Each valve unit in the system comprises a sem... | 11/04/1997 |
| 5677623 | Fault powered fault indicator having timed reset A fault indicator is described having a winding disposed on a magnetic pole assembly. The winding delivers energy from a monitored conductor to circuitry of the fault indicator. A series-connected threshold device, such as a four layer bilateral diode or ... | 10/14/1997 |
| 5670936 | Power controller enclosure A power controller (10) for supplying power to a power distribution network (N) in which power from a polyphase source (G) is routed to using equipment (E) connected to the network through the power controller. A plurality of solid-state power devices (82... | 09/23/1997 |
| 5650772 | Device for indicating a faulty condition of an electrical apparatus, in particular of a surge arrester The indicating device (3) is used for signalling a faulty condition of an electrical apparatus, in particular of a surge arrester (1). It contains a sensor (resistor 10) which is located in an insulating material housing (6) and is intended for detecting ... | 07/22/1997 |
| 5302945 | Electric appliance fault monitor and indicator A monitor and indicating circuit for an electric appliance detects the absence of the energization voltage for the appliance exceeding a predetermined threshold and provides a brilliant flash from a xenon lamp which is visible from great distances. The ci... | 04/12/1994 |
| 5267231 | Digital communication channel interface A differential protective relay system includes protective relays 19A and 19B at the terminals of a protected transmission line segment 21. Analog signals QL1 and QL2 are sampled at the respective ends of the protected line segment 21, digitally encoded u... | 11/30/1993 |
| 5247258 | System for measuring partial discharges A system for measuring partial discharges comprises a plurality of acquisition circuits each including a signal shaping circuit delivering a signal value, a multiplexer enabling the signal values provided by the various acquisition circuits to be delivere... | 09/21/1993 |
| 5241301 | Device and method for real-time monitoring of accidental damage to the protective covering of underground or immersed metal structures or pipelines A method for monitoring damage to the protective covering of immersed or underground metal structures subjected to cathodic protection, based on the electrical resistance offered by said covering, and consisting of modulating the cathodic protection feed ... | 08/31/1993 |
| 5210527 | Programmable spike detector A programmable spike detector is designed to detect spikes in a test signal in a device under test. The spike detector includes a differential amplifier which provides a difference signal representing the difference in voltage between the test signal and ... | 05/11/1993 |
