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| Number | Title | Issue Date |
| 7351009 | Fiber optic installation structures in a paved surface, ducts, and methods therefor A fiber optic installation structure and method therefor includes a duct having an inner tube, at least one optical waveguide, and a jacket and is disposed within a channel of a paved surface. The jacket generally surrounds the inner tube. When the duct is disposed ... | 04/01/2008 |
| 7312716 | Wireless communication using an intrinsically safe design for use in a hazardous area A wireless circuit setup is used in a hazardous area where the circuit is intrinsically safe and does not require explosion proof containment. In this setup, an intrinsically safe master barrier (420) is used without the use of a resistor and one or more resi... | 12/25/2007 |
| 7256701 | Motor driver A motor driver capable of detecting the insulation deterioration of a motor easily and inexpensively is disclosed. The voltage supplied from an AC power supply (1) is rectified by a first rectifying circuit (D1 to D6) and smoothed by a capacitor... | 08/14/2007 |
| 7248599 | Signal processing apparatus A signal processing apparatus receives a time divisional multiplexed signal including a plurality of kinds of data. The signal processing apparatus includes a processing unit for processing plural kinds of operations corresponding to the data of the time divisional ... | 07/24/2007 |
| 7129693 | Modular voltage sensor A voltage sensor is described that consists of a plurality of identical series-connected sections, where each section is comprised of an arrangement of impedance elements. The sensor is optimized to provide an output ratio that is substantially immune to changes in ... | 10/31/2006 |
| 7129710 | Printed circuit card A printed circuit card made of plastic has a carbonization sensor for protection against smoldering electrical fires. The carbonization sensor contains a first and a second conductor track disposed on the printed circuit card and also a monitoring device. The two co... | 10/31/2006 |
| 7123032 | Voltage sensor and dielectric material A voltage sensor is described that consists of an arrangement of impedance elements. The sensor is optimized to provide an output ratio that is substantially immune to changes in voltage, temperature variations or aging. Also disclosed is a material with a large and... | 10/17/2006 |
| 7109722 | Apparatus and method for PCB smoke and burn detection and prevention An apparatus and method for at least one of detecting and preventing burning of a PCB is disclosed. The method includes configuring a first comb array defined by a plurality of first fingers at a first potential; configuring a second comb array defined by a pluralit... | 09/19/2006 |
| 7088257 | Systems and apparatus for secure shipping A container is provided. The container includes a casing having an opening for admitting contents into the container. A matrix of conductive lines extends across at least a portion of the casing. A sensor senses a breach of integrity of the matrix. An indicator indi... | 08/08/2006 |
| 7045980 | Power converter and vehicle equipped with power converter A power source (120) supplies an input voltage (V 1). A voltage conversion circuit (130) converts the input voltage (V1) from the power source (120) into an operating voltage (V2) to be used to drive an electric load (150... | 05/16/2006 |
| 7012435 | State detecting method and insulation resistance fall detector A method of detecting a state of an insulation resistance fall detector that includes: a detection resistance connected in series to an insulation resistance between a vehicle body and a power source; a condenser provided between the insulation resistance and the de... | 03/14/2006 |
| 7005860 | Insulation resistance drop detector and method of detecting state thereof An insulation resistance drop detector 50 and a method of detecting a state of malfunction of the detector 50 are provided. When open of a coupling capacitor Co or malfunction of a lowpass filter 53 is occurred, a time constant of the low pass f... | 02/28/2006 |
| 6906506 | Method and apparatus for simultaneous measurement of electric field and temperature using an electrooptic semiconductor probe An apparatus and method to simultaneously measure electric and thermal fields with a single probe. Using an electrooptic semiconductor probe, the Pockels effect is employed to measure electric field magnitude and phase, and the effect of photon absorption due to ban... | 06/14/2005 |
| 6670888 | Method of detecting improper mounting of acceleration sensors on a vehicle A method of detecting the improper mounting of a sensor on a motor vehicle includes monitoring the output signals of the sensor, determining the noise levels in the output signals, and comparing the noise levels from the output signals to a threshold nois... | 12/30/2003 |
| 6172862 | Partial discharge relay and monitoring device A portable partial discharge detecting device for measuring partial discharge in energized electrical systems encloses a relay circuit and a DC power source. A pair of sensor circuits are enclosed within electrically coupling clamping mechanisms and are c... | 01/09/2001 |
| 6060986 | Protective glove breach monitoring A manipulating protective glove structure for use with non-conductive, hazardous materials, or materials sensitive to contamination, in a sealed environment, e.g., glove box. The glove structure embodies components which provide monitoring and signaling t... | 05/09/2000 |
| 6054865 | Multiple function electrical safety compliance analyzer A safety compliance test instrument includes circuitry for performing insulation resistance and ground circuit tests such as a ground bond test, as well as high voltage AC and DC dielectric withstand or hipot tests. A micro-processor based controller prov... | 04/25/2000 |
| 6043663 | Coaxial cable test instruments There are two coaxial cable test instruments, of which a primary instrument provides a rump circuit having a battery, a first electric signal device and two probes in series-connection with each other, of which the probes are in the form of the central co... | 03/28/2000 |
| 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 |
| 5936419 | Test method and apparatus utilizing reactive charging currents to determine whether a test sample is properly connected Prior to beginning a dielectric withstand (leakage current) or insulative impedance test, but after applying the high voltage that will be used in the test, the temporary charging currents resulting from application of the high voltage are measured and an... | 08/10/1999 |
| 5936536 | Electrical insulation testing device and method for electrosurgical instruments A device suitable for testing the integrity of insulation coating an electrosurgical instrument is described. The device includes a test sleeve and a fault detection unit. The test sleeve is generally tubular and defines an open bore with a resilient cond... | 08/10/1999 |
| 5764065 | Remote contamination sensing device for determining contamination on insulation of power lines and substations A remote contamination sensing device for contamination on insulation of electric power lines and substations includes a data logger and a supporting structure to which a sensing capacitor with at least two conductors is attached such that the conductors ... | 06/09/1998 |
| 5745042 | Load insulator A load insulator 2, for interposition into a loaded line, comprises a plurality of mechanical links 4 connected together to form a chain, and an electrical insulator 8 arranged between a pair of adjacent interlocked links 10,12 in the form of an insert of... | 04/28/1998 |
| 5652521 | Insulation monitoring system for insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems and capacitive insulation systems used on high voltage measurement and control apparatus such as instrument transf... | 07/29/1997 |
| 5640154 | Insulation monitoring system for insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems and capacitive insulation systems used on high voltage measurement and control apparatus such as instrument transf... | 06/17/1997 |
| 5621309 | Method for detecting a failed ZnO disk in a surge arrester network A method of detecting failed disks in power-system surge arresters comprising a network of at least two parallel-coupled stacks of series-coupled ZnO varistors includes measuring differential current flow through each pair of stacks during surge voltage c... | 04/15/1997 |
| 5594348 | Surge testing method in decompressed atmosphere for a small-size electric machine and apparatus thereof To carry out a non-destructive test for testing insulation of a small-size electric machine having a coil, a surge voltage is applied to the coil of the electric machine mounted in a decompression tank whose inner pressure is kept from 15 to 25 [Torr] so ... | 01/14/1997 |
| 5568132 | Load insulator A load insulator 2, for interposition into a loaded line, comprises a plurality of mechanical links 4 connected together to form a chain, and an electrical insulator 8 arranged between a pair of adjacent interlocked links 10,12 in the form of an insert of... | 10/22/1996 |
| 5471144 | System for monitoring the insulation quality of step graded insulated high voltage apparatus A non-ferrous current sensor is used to continuously measure the charging current magnitude in step-graded foil and paper insulation systems used on high voltage measurement and control apparatus such as instrument transformers and on the condenser bushin... | 11/28/1995 |
| 5461317 | Device for testing for a high voltage on the chassis of a piece of electronic apparatus A device for testing for leakage of electronic equipment has a female AC connector for receiving the male AC connector of the electronic equipment to be tested and a male AC connector for attaching the test device to a source of AC power. The device also ... | 10/24/1995 |
| 5430434 | Portable surgical early warning device A portable early warning device for use in detection of breaches in protective garments such as gloves, during surgical procedures and the like. The device embodies a central process and source unit containing sensing wave generator, indicators, driving c... | 07/04/1995 |
| 5416419 | Insulation defect detection by high voltage electrode means In an apparatus for testing cable (comprising a metallic core jacketed by insulation) to detect localized defects on the insulation caused by its carbonization, the cable is moved in an axial path through an array of five ring electrodes radially spaced f... | 05/16/1995 |
| 5396180 | System for monitoring gas insulated substations A diagnostic measuring system (20) for gas insulated electrical substations having UHF couplers (11) fitted to bus chambers (12) monitors for partial discharge events within the chamber (12) to identify the nature and location of an emergent breakdown con... | 03/07/1995 |
| 5359293 | Electrical cable arcing fault detection by monitoring power spectrum in distribution line A system for detecting arcing faults in DC electrical cable power distribution circuits, typically in telecommunications networks, monitors the power spectrum of distribution lines over a frequency band of about 4 Hz to 5 KHz in which current surges chara... | 10/25/1994 |
| 5341271 | Surge arrester fault indicator A fault indicator for a surge arrester includes an explosive cartridge which is detonated by a fault condition of an attached surge arrester to remove a covering which exposes colored, reflective tape to provide a visual indication of the faulted conditio... | 08/23/1994 |
| 5321362 | Digital filtering of EL CID data An electrical generator inspection system comprises an electro-magnetic core imperfection detector that provides an analog signal representative of fault currents detected between adjacent laminations of a stator core; an analog-to-digital converter coupl... | 06/14/1994 |
| 5303164 | Insulation monitor with improved precision The processing circuit of the insulation monitor comprises a microprocessor receiving on a first input a signal representative of the DC component, or the component of preset frequency different from the frequency of the mains system to be monitored, of t... | 04/12/1994 |
| 5276429 | Contact detecting and signaling device A portable generator generates a predetermined signal and has an output connected to a first transducer for transmitting the above signal to the body of a first operator (e.g. physician, nurse, etc.); and processing means for analyzing a signal picked up ... | 01/04/1994 |
| 5276428 | Contact detecting and signaling device A portable generator generates a predetermined signal and has an output connected to a first transducer for transmitting the above signal to the body of a first operator (e.g. physician, nurse, etc.); and processing means for analyzing a signal picked up ... | 01/04/1994 |
| 5214595 | Abnormality diagnosing system and method for a high voltage power apparatus An abnormality diagnosing system and method for high voltage power apparatus wherein a plurality of detectors for detecting abnormalities of the high voltage power apparatus and providing outputs indicative thereof are disposed to detect predetermined phe... | 05/25/1993 |
