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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 8044672 | Method for measuring D-Q impedance of polyphase power grid components A method is provided for measuring D-Q impedance of a component of a polyphase power grid connected to a grid node, and evaluating the margin of stability at a node using Nyquist diagrams generated from the measured D-Q impedance data. A generator, coupled to the po... | 10/25/2011 |
| 7812622 | Sensor and method for detecting analytes in fluids A fluid sensor is constructed to have a pair of electrodes whereas between electrodes there are not additional materials designated to adsorb analytes if their concentrations are high, or there are adsorbents if the analyte concentrations are low. An alternating cur... | 10/12/2010 |
| 7737706 | Method and apparatus for inspecting process performance for use in a plasma processing apparatus A method inspects a process performance of a capacitively coupled plasma processing apparatus which generates a plasma for a plasma processing by applying a radio frequency power between a first electrode and a second electrode disposed in a processing vessel to fac... | 06/15/2010 |
| 7696763 | Sensor and method for detecting analytes in fluids A fluid sensor is constructed to have a pair of electrodes whereas between electrodes there are not additional materials designated to adsorb analytes if their concentrations are high, or there are adsorbents if the analyte concentrations are low. An alternating cur... | 04/13/2010 |
| 7508224 | Method for measuring stability margin at a node of a polyphase power grid A method for measuring a stability margin at a node of a polyphase power grid injects suppressed-carrier stimulus into a node of the power grid by low-level amplitude modulation of the output voltage of a pre-exiting generator connected to the node. Response signals... | 03/24/2009 |
| 7489145 | Plasma processing system A high-frequency measurement unit includes a signal detector for detecting a high-frequency signal, and a calibration coefficient storage for storing calibration coefficients Cmin and Cmax used to calibrate a value Amin detected at the lowest limit frequency fmin an... | 02/10/2009 |
| 7429866 | System and method for resistance measurement A method for improved cable resistance measuring is provided including coupling a measurement test device including a master unit and a remote unit, via at least one connector, to at least one network cable and determining a terminating impedance using field calibra... | 09/30/2008 |
| 7405577 | Apparatus and method for distinguishing between flat objects An apparatus and a method for detecting the material of a surface of flat objects on a stack, in particular of objects individually separated from one another in the stack by interlayers, preferably of printing plates. The object is to reliably detect the material o... | 07/29/2008 |
| 7355415 | Method for on-line monitoring of condition of non-aqueous fluids A method for determining a condition of a highly resistive fluid in transportation and industrial equipment. The method is suitable for determining the condition of a non-aqueous fluid including applying a high-frequency voltage signal between electrodes immersed in... | 04/08/2008 |
| 7285964 | Method for signal extraction in a universal sensor IC A apparatus and method for creating a universally usable and configurable sensor platform which is used in conjunction with various sensor and sensing elements to sense and measure environmental conditions which incorporates inputs from multiple sensors 6-... | 10/23/2007 |
| 7259575 | Method for on-line fuel-dilution monitoring of engine lubricant A method for determining a fuel-dilution condition of a lubricant used in transportation and industrial equipment. The method uses apparatus that applies a high frequency and optionally a low frequency oscillating signal to electrodes immersed in the fluid and quant... | 08/21/2007 |
| 7250773 | Circuit for detecting difference in capacitance A circuit for detecting a difference in capacitance between a first capacitor and a second capacitor provided in a sensor includes an oscillator configured to generate an oscillating signal, a phase comparator coupled to the oscillator to output a signal responsive ... | 07/31/2007 |
| 7248977 | Phasor transducer apparatus and system for protection, control, and management of electricity distribution systems A system for measuring the delivery of electrical energy from an energy supplier to a consumer through an electric circuit is disclosed. The system includes devices coupled with the network. Each device comprises a sensor, an analog to digital converter, a processor... | 07/24/2007 |
| 7239155 | Electrochemical impedance measurement system and method for use thereof Disclosed is a method and apparatus for an electrochemical impedance measurement, and in particular circuitry and components employed for such measurements. The system employs an injected broadband AC signal to produce an associated response signal. The subsequent a... | 07/03/2007 |
| 7200502 | Dual connection power line parameter analysis method and system A method and apparatus is disclosed for determining the power line parameters of a system. Specifically, there is provided a method comprising perturbing a voltage waveform through a first connection, measuring a characteristic of the perturbation through a second c... | 04/03/2007 |
| 7161358 | Impedance analyzer An impedance analyzer includes a reference signal, a first converter a first coupler, a second converter, a second coupler, a modification circuit, a reference signal detector, and a reflected signal detector. The first coupler couples the reference signal to the fi... | 01/09/2007 |
| 7078906 | Simultaneous time-domain and frequency-domain metal detector A metal detector capable of operating in both a time-domain mode and a frequency-domain mode includes a transmitter component and a receiver component. The transmitter component includes a transmitter coil that can receive both an AC and DC current source for freque... | 07/18/2006 |
| 7079961 | Method and apparatus for measuring impedance of electrical component under high interference conditions A test system and method having a test channel and an additional channel, and wherein the ratio of amplitude and phase between the interference current through the device under test and the interference signal on the additional channel are determined. The system fur... | 07/18/2006 |
| 7068053 | Orientation sensor especially suitable for use in an underground boring device An orientation sensor especially suitable for use in an underground device is disclosed herein. This orientation sensor includes a sensor housing defining a closed internal chamber, an arrangement of electrically conductive members in a predetermined positional rela... | 06/27/2006 |
| 6992872 | Circuit breaker incorporating fault lockout protection A method of protecting multiple feeder circuits fed from a shared electrical distribution system is provided. The method includes providing a bypass line, providing bypass switches in the bypass line, providing a fault lockout protection controller coupled to the by... | 01/31/2006 |
| 6989755 | Signal transmission device and method A signal transmitting apparatus which makes exchanging information when pouring a liquid possible. A container body 201 of a transmitter side container 20 holds an electrically conductive liquid 402. A display 306 for confirming data rece... | 01/24/2006 |
| 6933714 | Method and apparatus for measuring the impedance of an electrical energy supply system The invention relates to a method and an apparatus for measuring the impedance of an energy supply system at a rated frequency by impressing a testing current (3) into the system and measuring (4) the resulting changes in a system current and a system ... | 08/23/2005 |
| 6922065 | Coil impendance detection method and object detection method and apparatus using the same A triangular wave generating circuit (21) generates a sweep voltage of a triangular wave, a VCO (22) generates a sweep of a frequency according to the sweep voltage, and a driving coil (4) is driven by the sweep voltage. From the current flowing... | 07/26/2005 |
| 6902318 | Thermometer for engine of vehicle Provided is a thermometer that is mounted on an engine incorporated in a vehicle and that measures the temperature of the engine during running of the vehicle. A temperature/resistance element included in the thermometer senses the temperature of the engine all the ... | 06/07/2005 |
| 6903558 | Digitizing ohmmeter system A digitizing ohmmeter system for providing a digital resistance measurement includes a current source for providing an excitation current to an impedance-varying input sensor and an ADC circuit including a charge-balancing modulator and a digital post processing cir... | 06/07/2005 |
| 6903560 | Orientation sensor especially suitable for use in an underground boring device An orientation sensor especially suitable for use in an underground device is disclosed herein. This orientation sensor includes a sensor housing defining a closed internal chamber, an arrangement of electrically conductive members in a predetermined positional rela... | 06/07/2005 |
| 6812716 | Method and apparatus for testing an electrical component A process and an apparatus for measuring the impedance of a capacitive sample and thereby determining the leakage impedance and the loss angle. To suppress the effects of ambient power frequency fields coupling onto the test object, measuring frequencies on either s... | 11/02/2004 |
| 6760633 | Method and apparatus for predicting stability of a closed loop apparatus A method for predicting stability of a closed loop apparatus is disclosed. The closed loop apparatus has an open loop impedance and at least one inherent internal gain. The method comprises the steps of: (a) identifying an impedance scaling factor associated with th... | 07/06/2004 |
| 6456096 | Monolithically compatible impedance measurement A monolithic sensor includes a reference channel and at least one sensing channel. Each sensing channel has an oscillator and a counter driven by the oscillator. The reference channel and the at least one sensing channel being formed integrally with a sub... | 09/24/2002 |
| 6326796 | Harmonic measuring method and a current injection device for harmonic measurement A harmonic injection point a is set on a power line extending downstream from a harmonic measuring point b in an electric power system. The currents of interharmonics are injected to the harmonic injection point a by a current injection device. The freque... | 12/04/2001 |
| 6285193 | Method of measuring insulation resistance of capacitor and apparatus for screening characteristics The insulation resistance of a capacitor is accurately measured within a short period of time by applying AC signals at two different frequencies f1 and f2 to the capacitor to measure the impedance Z1 and Z2 of ... | 09/04/2001 |
| 6184688 | Method of measuring insulation resistance of capacitor and apparatus for screening characteristics The insulation resistance of a capacitor is accurately measured within a short period of time by applying AC signals at two different frequencies f1 and f2 to the capacitor to measure the impedance Z1 and Z2 of ... | 02/06/2001 |
| 5818245 | Impedance measuring Impedance of a power system adapted for operation at a predetermined line frequency is measured by providing a test signal of frequency different from the predetermined line frequency by an increment significantly less than the predetermined line frequenc... | 10/06/1998 |
| 5744973 | Resistance to frequency circuit for measuring ambient temperature on a thermostat A resistance to frequency circuit for measuring the ambient temperature on a thermostat. The temperature measuring circuit comprises a first Schmitt trigger NAND gate, a rectifier, a capacitor of which one terminal is electrically connected to ground, a f... | 04/28/1998 |
| 5708363 | Liquid conductivity measurement system using a variable-frequency AC voltage A liquid conductivity measurement system is disclosed that accurately measures a liquid's conductivity over a range spanning at least several orders of magnitude using just a single sensor, but minimizing the adverse effects of capacitive and other non-li... | 01/13/1998 |
| 5504434 | Instrument for the measurement of electrical characteristics during manufacturing processes A measurement technique and instrument using rectangular pulse trains of differing repetition rates and synchronously operated lock-in amplifiers to reject electrical noise and capture changes in resistance and capacitance of an electrical element even du... | 04/02/1996 |
| 5428902 | Inclinometer sensing circuitry and operation Measurement circuitry for a biaxial inclinometer having electrolytic fluid incorporates a Schmitt trigger for measuring the resistance of each leg of the inclinometer by measuring the frequency output of the Schmitt trigger circuit while each leg is place... | 07/04/1995 |
| 5412318 | Device for detecting attempts at fraud on an apparatus for reading and writing on a chip card A device for detecting attempts at fraud by connection of an electric feed line (13) to an apparatus for reading and writing on a chip card (3) essentially comprises a resonance unit (6) coupled to a contacting element (2) of the apparatus, and a measurin... | 05/02/1995 |
| 5369371 | Electrical resistance test device with an attached comparison resistance set A megohm tester for determining resistance utilizing a relaxation oscillator which generates output pulses, at a rate dependent on an unknown resistance detected at a test site within an electronic apparatus, which can then be compared to known values pro... | 11/29/1994 |
| 5337004 | System for inspecting electrically conductive patterns such as antenna patterns on window glass Electrically conductive patterns such as antenna patterns on window glass are inspected for a wire break or a short circuit. The impedances between an electrically conductive pattern and an electrically conductive layer on an inspective table are measured... | 08/09/1994 |
