| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
|---|
| 12/06/1977 | US4061022 Hair testing apparatus |
| 11/29/1977 | US4060763 Arrangement for determining the effective value and/or the power of electrical signals |
| 11/22/1977 | US4059795 Digital eddy current apparatus for sensing and analyzing metallurgical characteristics of an electrically conductive material |
| 11/15/1977 | US4058764 Combined pilot light and ground testing assembly |
| 11/08/1977 | US4057754 Apparatus to measure the eccentricity of a shaft |
| 11/01/1977 | US4056739 Fail-safe electronic polarized relay |
| 10/25/1977 | US4055842 Digital device for measuring single and multiple impact impulses |
| 10/25/1977 | US4055798 Rotary electric field intensity measuring device |
| 10/25/1977 | US4055777 Window comparator |
| 10/25/1977 | US4055776 CCD differential current apparatus |
| 10/18/1977 | US4054856 Current transformer assembly for dynamoelectric machines |
| 10/18/1977 | US4054805 Electronic switching device |
| 10/11/1977 | US4053875 Static charge detector having fail-safe voltage surge protection means |
| 10/11/1977 | US4053799 Voltage memory device |
| 10/11/1977 | US4053796 Rectifying circuit |
| 10/04/1977 | US4052667 Moisture meter construction |
| 10/04/1977 | US4052665 Capacitive pickup device for pulsating high voltage measurements |
| 10/04/1977 | US4052664 Circuit monitor to determine power on and circuit working |
| 09/27/1977 | US4051444 Amplifier structure for low-level voltage measurements |
| 09/27/1977 | US4051436 Apparatus for and method of measuring polarization potential of a metallic structure |
| 09/20/1977 | US4049930 Hearing aid malfunction detection system |
| 09/13/1977 | US4048524 MOS voltage level detecting and indicating apparatus |
| 09/13/1977 | US4047815 Measurement of standard visual range |
| 09/06/1977 | US4047113 Feedback circuitry for charge digitizer |
| 09/06/1977 | US4047001 Encoding altimeter |
| 08/30/1977 | US4045725 Rotating asymmetric electrode for measuring characteristics of electrochemical cells |
| 08/30/1977 | US4045686 Voltage comparator circuit |
| 08/23/1977 | US4044311 Feature extraction system for extracting a predetermined feature from a signal |
| 08/23/1977 | US4044304 Device for checking a d c source voltage relative to a predetermined value |
| 08/23/1977 | US4044219 Method and apparatus for controlling flashing speed during resistance butt welding |
| 08/23/1977 | US4043112 Electronic timepiece having a battery voltage monitor |
| 08/23/1977 | US4043110 Electronic timepiece battery-potential detecting circuit |
| 08/16/1977 | US4042881 Voltage measuring device having an amplifier in the probe |
| 08/16/1977 | US4041691 Electronic timepiece battery monitoring circuit |
| 08/09/1977 | US4041410 RF level detector |
| 08/09/1977 | US4041382 Calibrating a measurement system including bridge circuit |
| 08/09/1977 | US4041380 Multi-function tester with removable circuit cartridge |
| 08/09/1977 | US4041373 Capacitive pulse pickup |
| 08/09/1977 | US4041370 Apparatus for rapidly detecting and calculating the root mean square of electrical measuring values in alternating current networks |
| 08/09/1977 | US4040788 Apparatus, instrumentation, and method for comparing samples |
| 08/02/1977 | US4039942 System for sensing electrical potential particularly in plants |
| 08/02/1977 | US4039937 Acoustic test apparatus for electrical networks including multi-phase power systems |
| 08/02/1977 | US4039858 Transition detector |
| 07/26/1977 | US4038695 Static trip unit for circuit protective devices |
| 07/26/1977 | US4037399 Electronic timepiece battery potential detecting circuitry |
| 07/19/1977 | US4037155 Current-responsive threshold detection circuitry |
| 07/19/1977 | US4036057 Automatic threshold control means and the use thereof |
| 07/12/1977 | US4035720 Ion gauge system |
| 07/05/1977 | US4034360 System for disabling the reset circuit of fault indicating means |
| 07/05/1977 | US4034284 Pull surfaces for insertion and removal of the tester |
| 07/05/1977 | US4034241 Voltage sensitive trigger circuit |
| 07/05/1977 | US4034168 Device to detect and automatically control electrical potential polarities |
| 06/28/1977 | US4032912 Intensity modulated display system |
| 06/28/1977 | US4032910 Portable |
| 06/28/1977 | US4032853 Overdrive detector for radio frequency amplifier |
| 06/28/1977 | US4032766 Wide range current flow fault detector |
| 06/21/1977 | US4031532 Voltage to frequency converter |
| 06/21/1977 | US4031464 Line power distortion detector |
| 06/21/1977 | US4031463 Power brown-out detector |
| 06/21/1977 | US4031410 Three-state discernment circuit |
| 06/21/1977 | US4030998 Detection of short circuits |
| 06/14/1977 | US4030086 Battery voltage detection and warning means |
| 06/14/1977 | US4030030 Probe assembly for an electric meter |
| 06/14/1977 | US4030016 Precision active rectifier circuit |
| 06/07/1977 | US4028627 Sample and hold valley detector |
| 06/07/1977 | US4028621 Portable automotive test probe |
| 06/07/1977 | US4028558 High accuracy MOS comparator |
| 05/31/1977 | US4027240 Protected voltage meter |
| 05/31/1977 | US4027239 Current level detector |
| 05/31/1977 | US4027236 Voltage and continuity checker |
| 05/31/1977 | US4027231 Battery charge indicator |
| 05/24/1977 | US4025850 Passive, solid state wide range voltage checker |
| 05/24/1977 | US4025849 Method of measuring analog input voltages through isolation transformers and apparatus for the same |
| 05/24/1977 | US4025803 Multi-level clipping circuit |
| 05/17/1977 | US4024471 Meter and amplifier circuit for measuring AC and DC signals |
| 05/17/1977 | US4024459 Amplitude measurement of signals of different frequency |
| 05/17/1977 | US4024415 Detecting device for detecting battery outlet voltage |
| 05/17/1977 | US4024398 Data derandomizer and method of operation for radiation imaging detection systems |
| 05/17/1977 | US4023396 Impact impulse measuring device |
| 05/10/1977 | US4023100 Transformer for d-c signals |
| 05/10/1977 | US4023099 Circuit arrangement for measuring the effective value of an electric signal |
| 05/10/1977 | US4023046 Low current drain amplifier incorporating means for minimizing sensitivity drift |
| 05/03/1977 | US4021793 Detector device for converting A.C. inputs to an D.C. output and a system for using the same |
| 04/26/1977 | US4020480 Catalytic detecting apparatus for detecting combustible gases and vapors |
| 04/26/1977 | US4020294 Presence and direction of line current flow detector |
| 04/19/1977 | US4019071 Biasing current attenuator |
| 04/12/1977 | US4017796 Electrical circuit means for use in analogue display and/or control systems |
| 04/12/1977 | US4017795 Heat sensitive fault detecting and indicating system for watthour meter |
| 04/12/1977 | US4017748 Monolithic AC level detector |
| 04/12/1977 | US4017742 Multiple input, multiple failure operational voter circuit |
| 04/05/1977 | US4016552 Dual polarity pulse detection circuit with variable voltage threshold |
| 04/05/1977 | US4016492 Pulse discriminator and misprobe detector for digital logic tester probe |
| 04/05/1977 | US4016491 Single knob rotary control of meter damping and push control of damping override |
| 04/05/1977 | US4016489 Ground-test circuit with minimal ground current |
| 04/05/1977 | US4016488 Pulsing ground-test circuit |
| 04/05/1977 | US4016408 Method and arrangement for supervising power supply systems |
| 03/29/1977 | US4015201 Electrical continuity and voltage testing device |
| 03/29/1977 | US4015150 Normally on led coulometric timing system |
| 03/29/1977 | US4015141 Apparatus for comparing voltages |
| 03/22/1977 | US4013952 Means for current measuring in static convertors |