Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8190385 | System and method for testing a solar panel A system and method for testing a solar panel. The system comprises an apparatus to be coupled electrically to two solar panels. The apparatus includes a processor and a memory having stored thereon instructions for calculating a ratio of respective operating parame... | 05/29/2012 |
| 8190386 | Apparatus and method to characterize multijunction photovoltaic solar cells An apparatus and method to electrically and optically characterize a multijunction solar cell. The apparatus can have as many light sources as there are subcells in the multijunction solar cell. Each light source has an optical spectrum that falls within the bandgap... | 05/29/2012 |
| 8165835 | Complex wavelet filter based power measurement and calibration system A power measurement and calibration system provides power and line frequency measurements by using a bandpass filter having complex voltage and current outputs from which real and imaginary power components can be determined. Calibration of the filter may be omitted... | 04/24/2012 |
| 8160829 | Current measuring device and processing unit comprising one such device The current measuring device comprises a first measuring resistor to receive a measurement current, and a first signal amplifier having an input connected to said first measuring resistor and an output to provide a first measurement signal. A second measuring resist... | 04/17/2012 |
| 8160828 | Apparatus, method and program for design validity verification of electronic circuit board with regard to power supply noise suppression Disclosed is a method for design validity verification of an electronic circuit board with regard to power supply noise, wherein with regard to an i-th LSI (i=1 to n) on the electronic circuit board, an input voltage Vin[i] to the LSI from the printed circuit board ... | 04/17/2012 |
| 8116999 | Control of delivery of current through one or more discharge lamps Method to identify a current drawn by a fluorescent lamp in a circuit. Methods include receiving a voltage supplied to a fluorescent lamp drawing a current in response to the voltage, digitally sampling the voltage at a sampling frequency and associating a first tim... | 02/14/2012 |
| 8108162 | Load calculation control method and apparatus A load calculation control method and apparatus for load characteristic tests of electric generator is provided, which enables continuous and precise following of a load control value. In this apparatus, a resistor bank α, which is to be connected to a load apparat... | 01/31/2012 |
| 8103466 | Distribution system analysis using meter data A monitoring system includes a first sensor positioned at a first location along a phase conductor line and a second sensor position at a second location along the phase conductor line. The first sensor is configured to generate a first set of synchrophasor data. Th... | 01/24/2012 |
| 8103467 | Determination of distribution transformer voltages based on metered loads A method for determining a primary side voltage of a distribution transformer includes determining a first current and a second current flowing through a secondary winding of the transformer at a plurality of time instants based on current meter data generated by a ... | 01/24/2012 |
| 8103468 | Methods and devices for evaluating the operating characteristics of a DBR laser diode In accordance with one embodiment of the present disclosure, a method of evaluating the operating characteristics of a Distributed Bragg Reflector (DBR) laser diode is provided. According to the method, a diagnostic electrical current is injected into the wavelength... | 01/24/2012 |
| 8078419 | Polishing monitoring method and polishing apparatus A method monitors a change in film thickness during polishing using an eddy current sensor. This method includes acquiring an output signal of the eddy current sensor as a correction signal value during water-polishing of a substrate, during dressing of the polishin... | 12/13/2011 |
| 8078418 | Intelligent electronic device and method thereof An intelligent electronic device (IED) having a gain control unit adapted to selectively regulate operating ranges of output signals of a sensing circuit of the device is described. In one embodiment, the IED is a digital electric power and energy meter, which opera... | 12/13/2011 |
| 8073645 | Apparatus and method to characterize multijunction photovoltaic solar cells An apparatus to electrically and optically characterize a multijunction solar cell. The apparatus can have as many light sources as there are subcells in the multijunction solar cell. Each light source has an optical spectrum that falls within the bandgap energy of ... | 12/06/2011 |
| 8073644 | Automatic voltage-identifying power supply device and method thereof An automatic voltage-identifying power supply device has a control module, a voltage regulation circuit, a current load measuring circuit electrically connected with an external post-stage power-receiving device, a power supply circuit and a pre-stage power supply d... | 12/06/2011 |
| 8069001 | Thermal protection system ablation sensor An isotherm sensor tracks space vehicle temperatures by a thermal protection system (TPS) material during vehicle re-entry as a function of time, and surface recession through calibration, calculation, analysis and exposed surface modeling. Sensor design includes: t... | 11/29/2011 |
| 8060324 | Device and a method for estimating transistor parameter variations A method and a device for estimating parameter variations of transistors that belong to the same circuit. The method includes: providing the first circuit; providing a test circuit adapted to perform a first function and a stacked test circuit adapted to perform a s... | 11/15/2011 |
| 8050878 | Method and system for estimation of source impedence on electrical distribution lines A device and method for dynamically determining an impedance of a network is disclosed. The device includes at least a processing system for measuring a network voltage and network current when said network is determined to be in a first state, measuring a network v... | 11/01/2011 |
| 8041523 | Battery charge/discharge current detection apparatus The battery charge/discharge current detection apparatus has a power supply circuit powered by a battery mounted on a vehicle and configured to detect a charge/discharge current of the battery by use of a current detecting resistor connected between a negative termi... | 10/18/2011 |
| 8041524 | Method of power factor correction A method of power factor correction without using current sensing or a multiplier is disclosed. A generated predictive pulse is used to charge and discharge a power factor correction (PFC) inductor so that the current in the PFC inductor has a similar phase angle as... | 10/18/2011 |
| 8024139 | Method and computer code for statistical process control for censored production data A method for monitoring device characteristics of semiconductor integrated circuits. The device characteristics includes censored data and uncensored data. The method includes determining a plurality of minimum breakdown voltages numbered from 1 through N, respectiv... | 09/20/2011 |
| 8005632 | Method and apparatus for detecting faults in a current sensing device A method and article of manufacture are provided to monitor a sensing system operative to monitor electrical current in a transmission line between an electrical storage device and an electrical machine. The sensing system comprises first and second sensors, operati... | 08/23/2011 |
| 7991568 | Digital multimeter with automatic measurement selection function A digital multimeter comprising a measured object input terminal, conversion circuit for a fast analog/digital converter, microprocessor, auxiliary program-controlled voltage or current source, potential divider network, electronic switches, and display. Compared wi... | 08/02/2011 |
| 7979223 | Systems and methods for power hardware in the loop testing A system for power hardware in the loop testing is described. The system includes a power system and a control system, the power system connected to a power converter of a device under test, the control system being in communication with the power system and the pow... | 07/12/2011 |
| 7974798 | Intelligent electronic device and method thereof An intelligent electronic device (IED) having a gain control unit adapted to selectively regulate operating ranges of output signals of a sensing circuit of the device is described. In one embodiment, the IED is a digital electric power and energy meter, which opera... | 07/05/2011 |
| 7930119 | Method for analyzing AC voltage signals A method is disclosed for analyzing an AC voltage signal with a transformation which transforms the signal from a representation in the time-domain to a representation in the frequency-domain. This transformation can be a fast Fourier transform, a discrete Fourier t... | 04/19/2011 |
| 7930118 | Electricity energy monitor An electric energy monitor or meter for efficient measuring and recording electrical energy usage data relating to a particular appliance or circuit. One embodiment comprises a thin-profile monitoring device through which an electrical conductor, for example the nor... | 04/19/2011 |
| 7925459 | Method and apparatus for determining an operating voltage for preventing photovoltaic cell reverse breakdown during power conversion A method and apparatus for determining an operating voltage lower bound for preventing photovoltaic (PV) cell reverse breakdown during power conversion. The method comprises determining a PV cell operating temperature; computing, at a controller, an operating voltag... | 04/12/2011 |
| 7920977 | Noncontact measurement method of currents on superconductive wires connected in parallel A noncontact method for measuring currents flowing through superconductive wires connected in parallel is provided. The method includes arranging hall sensors for measuring voltage levels based on magnetic fields generated around the superconductive wires, setting a... | 04/05/2011 |
| 7920978 | Method for detecting noise events in systems with time variable operating points A circuit for detecting noise events in a system with time variable operating points is provided. A first voltage, which is averaged over time, is compared to a second voltage. A signal is generated to instruct circuits within a processor to initiate actions to keep... | 04/05/2011 |
| 7917316 | Test system and computer program for determining threshold voltage variation using a device array A test system and computer program for measuring threshold voltage variation using a device array provides accurate threshold voltage distribution values for process verification and improvement. The test system and computer program control a characterization array ... | 03/29/2011 |
| 7908101 | Integrated circuit and method for monitoring and controlling power and for detecting open load state An integrated circuit and method for monitoring and controlling power and for identifying an open circuit state at an output port is disclosed. A circuit is implemented to determine whether an open circuit state exists based on a comparison of data received from the... | 03/15/2011 |
| 7908102 | Voltage measuring device A base of a pnp transistor Tr1 is connected to an isolation device D1, an emitter thereof is connected to a cathode of a high voltage battery BH, and a collector thereof is connected to an anode of the high voltage battery BH.... | 03/15/2011 |
| 7895004 | Method for measuring electric current in a plurality of conductors A method and system for measuring electric current in a plurality (n) of conductors. According to the invention, the method comprises the following steps: an electric current transducer is place substantially opposite to each conductor (I, i=1, . . . , n); a decorre... | 02/22/2011 |
| 7881890 | Method of prioritizing anomalies in a buried linear conductor A method of prioritizing anomalies in a linear conductor buried under a ground surface includes the steps of obtaining prioritization values for a plurality of anomalies along a linear conductor, and ranking the prioritization values according to magnitude. For each... | 02/01/2011 |
| 7840365 | Integrated circuit arrangement for current regulation An integrated circuit arrangement for current regulation of an electromagnetic load, especially an electric motor, generator, solenoid valve, or the like, with a coil, a power switch element, and a freewheeling diode is disclosed. In one embodiment, the circuit arra... | 11/23/2010 |
| 7831402 | Method and related device for estimating two currents flowing simultaneously through respective windings of a poly-phase electrical load driven in SVM mode A method for estimating values assumed at a certain instant of each period by currents flowing respectively in two distinct windings of a poly-phase load controlled in a space vector modulation (SVM) mode, using a same measuring device, may include coupling the meas... | 11/09/2010 |
| 7813885 | Method and apparatus for measurement of AC voltages in an HVAC system A control system to measure a sinusoidal AC voltage in a heating, ventilation includes a controller and a circuit connected to the controller. The circuit generates a pulse voltage based upon the AC voltage. The pulse voltage has a pulse duration. The controller mea... | 10/12/2010 |
| 7809515 | Protection device and a method that detect electricity A protection device for detecting electricity is composed of a control unit, a set of input ends for sampling, a display unit, an acoustic signal generating unit, and a power unit. The aforementioned control unit includes a microprocessor (CPU), a clock pulse wave g... | 10/05/2010 |
| 7805264 | Method of calculating internal resistance of secondary battery for vehicle A current Ibe and a voltage Vbe before a large current discharge in a secondary battery are stored in a memory. Plural voltage-current pairs are detected and stored in the memory during the large current discharge. Next, a regression curve (or a regression line) is ... | 09/28/2010 |
| 7774152 | Method of manufacturing image display apparatus A method of calculating node potentials in a network including current flow nodes on wirings with high precision at high speed is provided. Provided are a drive method of making voltages applied to electron-emitting devices uniform using the calculating method and a... | 08/10/2010 |
