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 |
| 7768253 | Sampling module and a method of sampling one or more analogue characteristics of a power transmission system A sampling module, for sampling one or more analog characteristics of a power transmission system, including at least one input circuit for sampling a respective analog characteristic. Each input circuit includes: a scaling circuit for reducing the magnitude of the ... | 08/03/2010 |
| 7412338 | Radio frequency device within an energy sensor system An energy measurement system including a radio frequency (“RF”) device powered by a solar panel. The RF device comprising a wireless communication port operative to transmit and receive communication over a wireless network of additional RF devices. The energy m... | 08/12/2008 |
| 7395044 | Signal processing apparatus and method of differential transformer A measuring apparatus employing a differential transformer includes a high-frequency oscillator which generates a high-frequency signal having a frequency higher than the excitation frequency of the differential transformer, a frequency divider which divides the hig... | 07/01/2008 |
| 7321482 | Sub-circuit voltage manipulation An integrated circuit is provided which in one embodiment includes a first sub-circuit coupled to a first power supply rail providing a first power supply voltage; a second sub-circuit coupled to a second power supply rail providing a second power supply voltage; an... | 01/22/2008 |
| 7305038 | Peripheral device receiver detection in a high noise environment A peripheral device includes a data port having high and low impedance terminations, a transmitter having a data signal generator and a receiver detector. The data signal generator is electrically coupled to the low impedance termination of the data port when in a l... | 12/04/2007 |
| 7190714 | Peripheral device receiver detection in a high noise environment A receiver detector of a peripheral device for use in a computer system to detect whether a receiver is electrically coupled to a data port of the peripheral device includes a modulator, a high pass filter, and a demodulator. The modulator is configured to modulate ... | 03/13/2007 |
| 7176670 | Method and apparatus for zero-mixing spectrum analysis with Hilbert transform An apparatus for analyzing a spectrum of an input signal (χ(t)) having at least one line with a center frequency ({circumflex over (ω)}x) at the center of the line includes: a mixer for zero-mixing the input signal (χ(t)) to produce a base band signal ... | 02/13/2007 |
| 7126323 | Systems and methods for synchronous detection of signals Systems and processes for synchronous demodulation of signals in detection contexts in order to improve frequency, magnitude and/or phase response over pulsed signal methods. According to a preferred embodiment, a return signal is demodulated for the time correspond... | 10/24/2006 |
| 6924724 | Method and apparatus for transformer bandwidth enhancement A method and apparatus for transformer bandwidth enhancement is disclosed. In one embodiment, a transformer is provided for use in a high frequency communication environment. In one configuration, the transformer is configured with one or more compensation networks ... | 08/02/2005 |
| 6904381 | Testing of a frequency converter device A user interface is presented for a tester that tests a frequency converter having an input port, an output port and a local oscillator port. In a first area, a user can specify frequency for an input signal to be placed on the input port. In a second area, the user... | 06/07/2005 |
| 6885184 | Galvanically isolated voltage sensing circuit Method and apparatus for galvanically isolated voltage sensing circuit. A circuit includes a scaling device that provides a scaled signal of an input voltage to a modulator. An oscillator provides a carrier frequency to the modulator, the modulator modulating the sc... | 04/26/2005 |
| 6809508 | Detection circuitry for surgical handpiece system Various circuit configurations for use in switch assembly used in a surgical hand piece system are provided. The circuit configuration provide a number of functions such as permitting the presence and direction of conductivity to be detected. The circuit configurati... | 10/26/2004 |
| 6734659 | Electronic interface for use with dual electrode capacitance diaphragm gauges Systems and methods for determining differential currents in a pair of circuits. In a preferred embodiment, an excitation voltage and a tightly coupled differencing current transformer are coupled to a differential capacitance manometer to generate a differential cu... | 05/11/2004 |
| 6590400 | Inductive signature measurement circuit An apparatus for measuring the inductance of a wire-loop with noise-cancellation, auto-calibration and wireless communication features, or detector circuit. The apparatus measures the effective change in inductance induced in a wire-loop as a vehicle pass... | 07/08/2003 |
| 6590379 | Apparatus for detecting the envelope of an input signal An envelope detector for detecting the envelope of an input signal. The envelope detector includes an inverter for inverting the input signal and two offsetting circuits for offsetting the input signal and the inverted input signal so as to align the peak... | 07/08/2003 |
| 6489776 | Non-contact mechanical resonance method for determining the near surface carrier mobility in conductors An apparatus using a resonator probe for determining an electronic property of a conductor across a dielectric. The apparatus has a device for inducing lateral mechanical oscillations of the resonator probe and a voltage source for producing a voltage dif... | 12/03/2002 |
| 6291980 | High-resolution measurement of phase shifts in high frequency phase modulators A phase difference to duty-cycle circuit converts a phase shifted signal and a reference signal into a single signal having a duty cycle that is a function of the phase difference between the two signals. The single signal may be further converted to a si... | 09/18/2001 |
| 6259259 | Method and apparatus for automatically adjusting the measurement range of admittance level sensors A method for rectifying a sensor current with a synchronous demodulator, wherein the rectifying factor of the synchronous demodulator can be controlled. A control clock pulse signal of the synchronous demodulator is toggled between at least two different ... | 07/10/2001 |
| 6078870 | Electricity meter with multiplexers for monitoring measurement channels An electricity meter includes measurement channels. In order to permit an extensive self monitoring of the measurement channels, input signals, in particular detected current signals and voltage signals, are detected in a double manner through different s... | 06/20/2000 |
| 5917319 | Methods and apparatus for sensing currents An apparatus for sensing current in a switching device having resistive voltage-current characteristics includes a first and second power terminal (typically common or ground) for the application therebetween of an operating potential (or alternatively, p... | 06/29/1999 |
| 5828576 | Power monitor apparatus and method with object oriented structure An object oriented architecture is used within individual monitoring units. The monitoring devices include circuitry which receives an electrical signal and generates at least one digital signal representing the electrical signal. Objects within such indi... | 10/27/1998 |
| 5650936 | Power monitor apparatus and method with object oriented structure An object oriented architecture is used within individual monitoring units. The monitoring devices include circuitry which receives an electrical signal and generates at least one digital signal representing the electrical signal. Objects within such indi... | 07/22/1997 |
| 5646520 | Methods and apparatus for sensing currents An apparatus for sensing current in a switching device having resistive voltage-current characteristics includes a first and second power terminal (typically common or ground) for the application therebetween of an operating potential (or alternatively, p... | 07/08/1997 |
| 5594329 | Method and apparatus for obtaining voltage-isolated measurement channels with an isolation transformer and multiplier A method and apparatus for obtaining a voltage-isolated measurement channel in a measurement instrument is provided. An input signal is multiplied with a clock signal to obtain a modulated input signal that is coupled to an input winding of a balanced tra... | 01/14/1997 |
| 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 |
| 5440229 | Fundamental voltmeter Apparatus is disclosed for measuring the fundamental voltage, fundamental frequency and the fundamental voltage divided by the fundamental frequency of the output of a device, such as an inverter. Through the use of an isolation amplifier connected across... | 08/08/1995 |
| 5365184 | Quadrature phase processing A phase modulated signal is split into quadrature components Savg+SaSin($c;(t)+kx(t)) and Cavg+CaCos(($c;(t)+kx(t)). The average value for each signal is compared with the signal to produce a data bit whose meaning is that the average value was exce... | 11/15/1994 |
| 5097229 | Modulator - demodulator transformer coupled D.C. to one Mhz information channel An analog direct current to one MHz information channel is provided, with high acccuracy and 10K volt input-output isolation. The information channel has a voltage to current converter which receives the analog input signal, and whose output is modulated ... | 03/17/1992 |
| 5083080 | High frequency signal measuring equipment with cabled detecting and signal companding A signal detector includes a signal input section, a detector, and a converter. The signal input section inputs a high frequency signal to be measured. The detector detects the high frequency signal to be measured input by the signal input section. The co... | 01/21/1992 |
| 5034681 | Voltage detection A circuit arrangement for detecting an input voltage comprises an oscillator responsive to the voltage, the oscillator including a pair of transistors (8, 9) connected as an astable multivibrator, each of the transistors having a load which comprises a pr... | 07/23/1991 |
| 4949030 | Isolated analog voltage sense circuit An improved isolated analog sense circuit comprises a sensor for passively sensing voltages, a transformer, a capacitor, a clock signal generator, a switch, and a diode. The transformer has two windings, the first of which is coupled to the sensor with th... | 08/14/1990 |
| 4933888 | Process for the digitization and linearization of a transducer with a quasi-sinusoidal periodic characteristic and corresponding apparatus Process for the digitization and linearization of a quasi-sinusoidal periodic characteristic transducer and the corresponding apparatus. The process consist of measuring a variation (Ɗ$c;x) of a signal ($c;x) received by the transd... | 06/12/1990 |
| 4890333 | Test bench for wideband radio link A test bench is designed to determine the transfer function of a radio link in terms of variations in amplitude and a group propagation time depending on frequency. A transmission section of the test bench comprises an oscillator delivering a pulse signal... | 12/26/1989 |
| 4814695 | Measurement method for an electrical signal, series-parallel negative-feedback measuring circuit, as well as use of the method of the measuring circuit for measuring voltage sources with very-high-ohmage internal impedances For measuring voltage sources with capactive internal impedance (ZG) the voltage source is connected to a charge amplifier (7) whose input capacitance comprises a vibrating capacitor (C(t)). The output of charge amplifier (7) is connected in se... | 03/21/1989 |
| 4747035 | Isolator for power system instrument A device for isolating an electrical instrument from an input voltage signal at a floating potential. The device includes a transformer with a center-tapped primary winding, a center-tapped secondary winding and a core magnetically coupling the primary an... | 05/24/1988 |
| 4683436 | Surface potential electrometer and image forming apparatus using the same The surface potential electrometer includes a reciprocating chopper, a measuring electrode on which a voltage is induced which is associated with the surface potential of a member to be measured, a shield member for shielding the measuring electrode and t... | 07/28/1987 |
| 4669037 | Isolator for power system instrument A device for isolating an electrical instrument from an input voltage signal at a floating potential. The device includes a transformer with a center-tapped primary winding, a center-tapped secondary winding and a core magnetically coupling the primary an... | 05/26/1987 |
| 4649336 | Automatic, self sustaining probe for measuring the work function An apparatus for measuring changes in the work function of a surface using a method devised by Kelvin and known as the "dynamic capacitor method". This apparatus comprises a system for monitoring and automatically regulating the vibration of a Kelvin prob... | 03/10/1987 |
| 4628256 | Thermocouple power meter An improved meter for measuring RF power. The RF power is applied to thermocouple means which transforms the RF power into a low level d.c. signal which then passes through a chopper stage that is driven by a clamped sinusoidal input. The output of the ch... | 12/09/1986 |
| 4591810 | Pulse width modulator for electronic watthour metering A pulse width modulator for an electronic kilowatt-hour meter includes an integrator having its inputs connected to a square wave clock signal and a sine wave signal proportional to the time derivative of current on the metered circuit. A plurality of ser... | 05/27/1986 |
