| Patents for G01R 21 - Arrangements for measuring electric power or power factor (6,609) |
|---|
| 08/29/1989 | CA1258929A1 Method of and system for accumulating verifiable energy demand date from remote electricity meters |
| 08/22/1989 | US4859937 Pulse width modulator in an electronic watt-hour meter with up and down integration for error correction |
| 08/15/1989 | US4858141 Non-intrusive appliance monitor apparatus |
| 08/01/1989 | US4853620 Circuit arrangement comprising multiplier circuits to find the sum of electrical power outputs for application in multi-phase electricity meters |
| 07/27/1989 | DE3800872A1 Apparatus for the purposes of receiving, decoding and displaying information which is fed into public power supply networks |
| 07/25/1989 | US4852030 Time-of-use-meter with a calendar of cyclic events |
| 07/05/1989 | EP0322802A1 Watthour meter or wattmeter comprising hall sensors |
| 06/27/1989 | US4843311 Wattmeter comprising a hall sensor and an A/D converter |
| 06/27/1989 | US4843310 Electricity meter with arrangement for monitoring core saturation incidents |
| 06/14/1989 | EP0320265A2 Wide dynamic range radio-frequency power sensor |
| 06/13/1989 | US4839819 Intelligent power monitor |
| 06/07/1989 | CN1033322A Integrated poly-phase power meter |
| 06/06/1989 | US4837504 Electricity meter and method of calibrating same |
| 05/24/1989 | CN1033111A Multichannel on-line system for measuring power factor and cycle rate |
| 05/23/1989 | US4833401 Electrical measuring instrument for high voltage power measurements |
| 05/23/1989 | CA1254619A1 Low cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sensor |
| 05/17/1989 | EP0315834A1 Meter with two tarif counters for the separate calculation of the current usage of two user groups |
| 05/16/1989 | CA1254266A1 Current peak meter |
| 05/10/1989 | EP0072857B1 Data communication system |
| 05/09/1989 | US4829239 Multimeter |
| 05/09/1989 | CA1253968A1 Power metering system and method |
| 04/26/1989 | EP0312715A1 Circuit arrangement for the determination of a frequency band-limited periodic signal |
| 04/25/1989 | CA1253207A1 Microwave thermographic apparatus |
| 04/19/1989 | CN2036275U Speedy power factor measurer for medium frequency power source |
| 04/04/1989 | US4819180 Variable-limit demand controller for metering electrical energy |
| 03/30/1989 | DE3731384A1 Microwave calorimeter |
| 03/29/1989 | EP0308924A1 Multiplier and watt-hour meter |
| 03/28/1989 | US4817045 Monitored control arrangement |
| 03/21/1989 | US4814996 Portable energy cost calculation |
| 03/21/1989 | US4814696 Method and circuit arrangement for measuring in-phase and quadrature components of current in an electrical alternating current power supply |
| 03/16/1989 | DE3730138A1 Method of dynamically controlling the reactive power of compensation installations |
| 03/08/1989 | CN2033907U Controller for limiting electric power |
| 03/07/1989 | US4810960 Measuring adjacent channel power |
| 03/07/1989 | US4810954 Poynting vector probe for measuring electrical power |
| 02/28/1989 | US4808918 Watthour meter comprising a Hall sensor and a voltage-frequency converter for very low voltages |
| 02/21/1989 | US4806854 Current draw and power consumption display circuit |
| 02/16/1989 | DE3726745A1 Method for determining the fundamental mode reactive power of an R-L load |
| 02/14/1989 | US4804957 Utility meter and submetering system |
| 02/08/1989 | EP0302172A1 Arrangement for determining the sum of electical powers, especially for use in polyphase electricity counters |
| 02/08/1989 | EP0302171A1 Appliance for transforming an electrial polyphase signal in a frequence |
| 02/08/1989 | EP0302170A1 Appliance for measuring electric power and its application particularly in polyphase electricity meters |
| 02/08/1989 | CN2032324U Electronic watt-howr meter |
| 02/07/1989 | US4803632 Intelligent utility meter system |
| 01/31/1989 | US4801874 Method and apparatus for measuring electricity |
| 01/31/1989 | CA1249631A1 Calibrated power detector |
| 01/24/1989 | US4800333 For measuring energy consumption in an electrical system |
| 01/18/1989 | CN2031103U Pocket digital watt meter |
| 01/03/1989 | US4795974 Digital energy meter |
| 12/28/1988 | EP0296968A2 Integrated poly-phase power meter |
| 12/28/1988 | EP0296967A2 Amplifier for voltage or current to frequency converter |
| 12/28/1988 | EP0296966A2 Triangle waveform generator for pulse-width amplitude multiplier and associated method |
| 12/27/1988 | US4794369 For sampling the current/voltage signals in electricity |
| 12/27/1988 | US4794333 Continuous switched-capacitor dual slope watthour meter circuit with charge injection offset compensation |
| 12/27/1988 | US4794325 Calibrated power detector |
| 12/21/1988 | EP0295864A2 Consumption meter |
| 12/20/1988 | US4792677 System for use with a utility meter for recording time of energy use |
| 12/14/1988 | EP0294854A2 Microwave thermographic apparatus |
| 12/07/1988 | EP0293639A2 Device for acquisition, storage, and/or manipulation of amounts consumed |
| 12/06/1988 | US4789823 Power sensor for RF power measurements |
| 12/06/1988 | CA1246147A1 Electronic circuit for measuring electrical energy |
| 11/30/1988 | EP0292636A1 Current converter for measuring the current flowing in an electric conductor |
| 11/29/1988 | US4788494 Power measuring apparatus |
| 11/29/1988 | US4788493 Apparatus for detecting direction of electric power flow |
| 11/24/1988 | DE3715528A1 Current monitoring circuit with inductive converters |
| 11/22/1988 | US4786877 Amplifier for voltage or current to frequency converter |
| 11/22/1988 | US4786863 Solid state watthour meter with switched-capacitor integration |
| 11/17/1988 | EP0290951A2 Current converter circuit |
| 11/10/1988 | DE3813498A1 System for telemetering (remote metering) the electric power consumption of different loads (consumers) |
| 11/08/1988 | US4783748 Method and apparatus for remote measurement |
| 11/03/1988 | WO1988008596A1 A method in alarm system, including recording of energy consumption |
| 11/01/1988 | US4782375 Integratable hall element |
| 11/01/1988 | US4782287 Watt-hour meter |
| 10/26/1988 | EP0288413A1 Digital power metering |
| 10/12/1988 | EP0286544A2 Real time solid state register having battery backup |
| 10/04/1988 | US4775834 Pulse width-pulse height multiplicator in a static kWh meter |
| 10/04/1988 | US4775828 Power level indicator for an electric generator |
| 09/27/1988 | US4774457 Electric power measuring devices |
| 09/14/1988 | EP0282208A1 Method and apparatus for measuring electricity |
| 09/07/1988 | CN87216385U Multi-function device against stealing electric power |
| 09/06/1988 | CA1241697A1 Packaging for electronic demand register |
| 09/06/1988 | CA1241696A1 Memory programmer interface for electronic demand register |
| 08/30/1988 | US4767280 Computerized controller with service display panel for an oil well pumping motor |
| 08/30/1988 | CA1241376A1 Electronic meter for measuring active and reactive energies in a three phase network |
| 08/23/1988 | CA1241061A1 Solid state electronic pulse scaler using ratio of two integers |
| 08/17/1988 | EP0278223A1 Static power measuring apparatus |
| 08/16/1988 | US4764720 Apparatus and method for measuring variable frequency power |
| 08/02/1988 | US4761606 Auto-ranging in electric watthour meter |
| 07/27/1988 | EP0153401B1 Static kwh meter |
| 07/27/1988 | EP0152476B1 Static kwh meter |
| 07/14/1988 | DE3644205A1 Arrangement for determining a signal which is proportional to the power of a radio-frequency signal |
| 07/12/1988 | US4757263 Insulation power factor alarm monitor |
| 06/29/1988 | EP0272504A1 Solid state electricity meter with an electromagnetic meter display |
| 06/28/1988 | US4754219 Low cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sensor |
| 06/28/1988 | CA1238686A1 Method and device for measuring an electric quantity average value related to a series of periodic wave trains |
| 06/23/1988 | DE3642478A1 Device and circuit arrangement for measuring electrical power and its time integral |
| 06/22/1988 | CN87202610U Intelligent tester for power factor |
| 06/21/1988 | US4752731 Electronic type electric energy meter |
| 06/21/1988 | CA1238364A1 Electronic energy and power monitoring apparatus |
| 06/08/1988 | EP0269827A1 Digital measuring apparatus |
| 06/07/1988 | US4749941 Circuit arrangement for a meter for measuring two electrical quantities |