| Patents for G01R 21 - Arrangements for measuring electric power or power factor (6,609) |
|---|
| 01/07/1992 | US5079454 Temperature compensated FET power detector |
| 01/07/1992 | CA1293995C Real time solid state register having battery backup |
| 01/02/1992 | EP0263154B1 Multimeter |
| 12/18/1991 | EP0462045A1 Digital power metering |
| 12/12/1991 | WO1991019201A2 System and method for monitoring and analyzing energy characteristics |
| 12/11/1991 | EP0460734A1 Autonomous pulse reading and recording system |
| 12/10/1991 | US5072187 Method and apparatus for determining the total harmonic distortion and power factor of a non-linear load circuit |
| 12/10/1991 | US5072173 Phase detector for mark/space modulated signals |
| 11/27/1991 | CN1014932B Method and apparatus for converting electrical signal into proportional frequency |
| 11/21/1991 | EP0457649A1 Measuring circuit for instantaneous power |
| 11/21/1991 | EP0456868A1 Error compensation device for an induction type electricity meter |
| 11/21/1991 | EP0456763A1 Sensor |
| 11/21/1991 | DE4115418A1 Electrical power measuring circuit - has voltage and current input and output protection stages, and feeds voltage and current values to analogue multiplier |
| 11/19/1991 | US5066906 Time of use register for use with a utility meter |
| 11/13/1991 | EP0455839A1 Circuit for measuring of the real and/or reactive power at a converter with impressed direct voltage |
| 11/13/1991 | CN2088697U Transformer load recording card |
| 11/06/1991 | EP0454946A1 Process for obtaining approximative values of instant values of parameters of at least a sinusoidal signal with constant and known frequency |
| 10/30/1991 | EP0454360A1 Digitally measuring electrical energy consumption |
| 10/29/1991 | US5061890 Method and apparatus for digitally measuring electrical energy consumption |
| 10/29/1991 | CA1291536C Watthour meter with isolation transformers having a feedback loop |
| 10/23/1991 | CN1055607A High-precision pulse power measurement and equipment |
| 10/23/1991 | CN1055606A Combined instrument with electronic arithmetic circuitry for electrical-power automatization |
| 10/22/1991 | US5059896 Electronic watthour meter |
| 10/08/1991 | CA1290400C Digital power metering |
| 10/08/1991 | CA1290395C Program clock for an electronic demand register with automatic calibration based on sensed line frequency |
| 10/06/1991 | CA2034390A1 Compensating for power outage in electric energy meter |
| 10/02/1991 | EP0448910A1 Metering management system responsive to supplied wave form and including a secure metering apparatus |
| 10/01/1991 | US5053766 Telemetering system for electrical power consumed by various users |
| 10/01/1991 | US5053697 Input circuit for an electrical energy meter |
| 09/25/1991 | EP0448264A2 Phase shifting circuits |
| 09/18/1991 | EP0446962A2 Solid state electricity meter display |
| 09/03/1991 | CA1288464C Method and/or apparatus for controlling the motor speed of an electric ac motor and/or a method of determining torque |
| 09/01/1991 | CA2011227A1 Electronic meter digital phase compensation |
| 08/28/1991 | CN2083755U Digital kilowatt-hour meter |
| 08/14/1991 | CN2082867U Radiofrequency passing type power/standing-wave ratio meter |
| 08/08/1991 | WO1991011725A1 Instantaneous multiplier for use in power measurement systems |
| 07/31/1991 | EP0438637A1 Method and apparatus for the determination of an effective value Ieff of a current to be measured using a Hall element and an amplifier circuit |
| 07/24/1991 | EP0437585A1 Process for metering electric power and device for its implementation. |
| 07/24/1991 | CN1013307B Method for instantaneously measuring a.c. quantity of electricity and device thereof |
| 07/16/1991 | US5032974 Three-phase alternating current circuit configuration, for using a power supply for the synchronized timing for an electrical apparatus |
| 07/16/1991 | US5032785 Arrangement for measuring an electrical power or energy |
| 07/16/1991 | US5032731 Sensor and device for the measurement of radiant energy, in particular the energy associated with radio-frequency, microwave and light radiation signals |
| 07/11/1991 | WO1991010146A1 Method and apparatus for measuring electric units |
| 07/10/1991 | EP0436369A2 An electronic power meter |
| 07/10/1991 | CN1052952A Electric measurement without transducer and equipment thereof |
| 07/09/1991 | CA1285991C Input switching in electronic watthour meter |
| 07/03/1991 | CN1052736A Multi-functional intelligence watt-hour meter |
| 06/26/1991 | EP0434248A2 Electrical power measuring devices |
| 06/25/1991 | US5027044 Load state decision apparatus for servomotor |
| 06/25/1991 | CA1285322C Digital measuring instrument |
| 06/19/1991 | EP0432386A1 Arrangement to determine the values of electrical variables, that can be derived from at least two electrical input signals of the arrangement |
| 06/19/1991 | EP0432367A1 Device for calculating the tariff with secure bidirectional interface |
| 06/18/1991 | CA1285027C Freezing items for display in electronic watthour register |
| 06/16/1991 | CA2025249A1 Tariff arrangement with secure bidirectional interface |
| 06/15/1991 | CA2029936A1 Arrangement for ascertaining values of electric quantities which are derivable from measured values of at least two electric input quantities of the arrangement |
| 06/11/1991 | US5023822 Pulse ratio system |
| 05/21/1991 | US5017860 Electronic meter digital phase compensation |
| 05/07/1991 | US5014213 System for use with polyphase utility meters for recording time of energy use |
| 04/23/1991 | CA2009069A1 Electrode array for meter reading device |
| 04/23/1991 | CA1283453C Continuous switched-capacitor dual slope watthour meter circuit with charge injection offset compensation |
| 04/23/1991 | CA1283451C Switched-capacitor watthour meter circuit having reduced capacitor ratio |
| 04/17/1991 | CN2075346U Digit multifunctional standard meter for electric energy |
| 04/09/1991 | US5006846 Power transmission line monitoring system |
| 04/09/1991 | US5006790 Electronic thermal demand module |
| 04/03/1991 | EP0420545A2 Electronic watthour meter |
| 04/03/1991 | EP0420535A2 Power supply and monitor for controlling an electrical load following a power outage |
| 04/03/1991 | EP0419452A1 A method in alarm system, including recording of energy consumption. |
| 03/26/1991 | CA2021078A1 Electronic watthour meter |
| 03/21/1991 | WO1991003740A1 Electronic watt-hour meter |
| 03/20/1991 | CN2073590U Digital-display dc electrodynamometer |
| 03/12/1991 | US4999575 Power supply and monitor for controlling an electrical load following a power outage |
| 03/05/1991 | US4998071 Noise parameter test method and apparatus |
| 03/05/1991 | US4998061 Watthour meter with temperature compensation for wye connected systems |
| 02/21/1991 | DE3927414A1 Monitoring mining machinery, installations and power supply - measuring and evaluating current and voltage with measuring appts. integrated in existing compact stations |
| 02/20/1991 | EP0413271A2 Electric power measuring system |
| 02/14/1991 | DE3926160A1 Electronic meter for amt.-measuring pulses - has pulse generator driven by mechanical measuring counter, real=time clock and EPROM(s) |
| 02/13/1991 | CN2071343U Shock-proof electronic electric meter |
| 02/12/1991 | US4992725 Meter for accurately measuring integrated electric power |
| 02/06/1991 | CN1011553B Electronic type electric energy metering apparatus |
| 02/05/1991 | WO1991002255A1 Process for metering electric power and device for its implementation |
| 02/05/1991 | US4990893 Method in alarm system, including recording of energy consumption |
| 02/05/1991 | CA2038942A1 Process for metering electrical energy and device for carrying out said process |
| 01/29/1991 | US4989155 Intelligent power monitor |
| 01/29/1991 | CA1279699C Method and apparatus for measuring electricity |
| 01/24/1991 | DE3923590A1 Error compensating circuitry for electronic electricity meter - has ohmic resistor and capacitor in series between common pole of changeover switch and phase lead of mains |
| 01/22/1991 | US4987467 Integratable hall element |
| 01/22/1991 | US4987363 Electric energy meter with power outage recovery circuit |
| 01/16/1991 | EP0407902A2 Consumption indication device for supply means |
| 12/25/1990 | US4980634 Electric power measuring system |
| 12/19/1990 | EP0403330A1 Input circuit for electric energy meter |
| 12/19/1990 | CN1010892B Milimeterwave full band power meter |
| 12/18/1990 | US4979122 Apparatus and method for monitoring power |
| 12/18/1990 | US4978911 Electrical energy analyzer |
| 12/13/1990 | DE3918888A1 Determining active power of RL-load e.g in resistance welding - involves measuring current peak valve and using sets of characteristic curves relating e.g. load and control angles and phase |
| 12/12/1990 | CN1047652A Recording device of electric brake for electric drived locomotive |
| 12/11/1990 | US4977366 High frequency power sensing device |
| 12/11/1990 | CA1277709C Wave-leakage measuring apparatus and measuring method |
| 11/28/1990 | CN2066582U Coaxial type compensation probes for electric level meter |
| 11/27/1990 | US4973901 Compensating for power outrage in electric energy meter |
| 11/20/1990 | US4972141 Watthour meter or wattmeter comprising hall sensors |