| Patents for H02H 3 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection (33,031) |
|---|
| 02/22/1977 | US4009420 Solid state power controller |
| 02/22/1977 | US4009419 Safety circuit for video diver |
| 02/15/1977 | US4008417 Phase loss detector |
| 02/08/1977 | US4007401 Current sensitive circuit protection system |
| 02/01/1977 | US4006387 Low power solid state three-phase overcurrent/undercurrent protection circuit |
| 02/01/1977 | US4006348 Apparatus for monitoring two electric quantities by combining three consecutive samples of each quantity |
| 02/01/1977 | US4006320 Fault locating system and method for transmission lines and repeater stations |
| 01/25/1977 | US4005344 Protection circuit for battery powered electronic devices |
| 01/18/1977 | US4004201 Multi-function solid state trip unit with trip indicating means |
| 01/18/1977 | US4004160 Switching system to short-circuit a load with minimum residual voltage |
| 01/11/1977 | US4002951 Electrical receptacle mounted ground fault interrupter with automatic plug insertion testing |
| 01/11/1977 | US4002950 Power transmission control system |
| 01/11/1977 | US4002948 Long delay acceleration module for an overload relay system |
| 01/04/1977 | US4001804 Ground fault protection for electrical power distribution systems |
| 01/04/1977 | US4001654 Testable protective system |
| 01/04/1977 | US4001648 Ground fault detector |
| 01/04/1977 | US4001646 Ground fault circuit interrupter utilizing a single transformer |
| 12/28/1976 | US4000446 Overload protection system for three-phase submersible pump motor |
| 12/28/1976 | US4000445 Trip circuit for an electric circuit breaker |
| 12/28/1976 | US4000444 Electric circuit breaker with ground fault protection |
| 12/21/1976 | US3999104 Electronic safety circuits |
| 12/21/1976 | US3999103 Multi-pole ground fault circuit breaker |
| 12/21/1976 | US3999087 Missing phase detection circuit for use with three-phase power sources |
| 12/14/1976 | US3997818 Load selective power systems |
| 12/07/1976 | US3996513 Differential microampere current sensor |
| 12/07/1976 | US3996499 Zener diode effect on long acceleration module |
| 11/23/1976 | US3993984 Electronic underfrequency relay |
| 11/16/1976 | US3992678 Protective circuit for transistor amplifier |
| 11/16/1976 | US3992651 Active symmetrical component network for protective relays |
| 11/16/1976 | US3992650 Apparatus to prevent overcurrent or overvoltage |
| 11/16/1976 | US3992649 Current differential fault detection circuit |
| 10/26/1976 | US3988644 Current protection circuit |
| 10/26/1976 | US3988641 Phase breakdown- and null current-detector, especially for an electronic motor protection relay possessing current-dependent triggering |
| 10/19/1976 | US3987393 Line voltage monitor |
| 10/19/1976 | US3987365 Digital frequency comparator circuit |
| 10/19/1976 | US3987342 Protective circuit utilizing multilevel power supply output |
| 10/19/1976 | US3987341 Open neutral protection |
| 10/19/1976 | US3987340 Combination motor controller including resistor shunted fusible elements |
| 10/12/1976 | US3986079 Offset keying technique for segregated phase comparison relaying |
| 10/05/1976 | USRE28996 Ground leakage differential protective apparatus |
| 10/05/1976 | US3984737 Protective relaying system |
| 10/05/1976 | US3984736 Leakage protective device |
| 10/05/1976 | US3984734 Protective circuit arrangement for a high-voltage capacitor bank |
| 09/28/1976 | US3983456 Phase comparison protective relay for a transmission |
| 09/28/1976 | US3983455 Direct transfer-trip relaying system |
| 09/28/1976 | US3983377 Method and apparatus for detecting a fault location at an electrical conductor |
| 09/21/1976 | US3982158 Power distribution control system |
| 09/07/1976 | US3979689 Differential amplifier circuit |
| 09/07/1976 | US3979645 Protective circuit for short-circuit and overload protection of a power circuit |
| 09/07/1976 | US3979644 Overvoltage protection arrangement |
| 09/07/1976 | US3979255 Method for operating a system with a variable excursion margin setpoint |
| 08/31/1976 | US3978400 Ground fault detector with a nonlinear sensing means |
| 08/31/1976 | US3978374 Method and apparatus for the detection of short circuits |
| 08/31/1976 | US3978373 Circuit breaker |
| 08/24/1976 | US3976955 Protective circuit for pulse width modulated signal amplifier |
| 08/24/1976 | US3976918 False triggering protection for ground fault sensor |
| 08/17/1976 | US3975677 Method and apparatus for testing an inductive device for the presence of a voltage suppressor |
| 08/17/1976 | US3975663 Method of an apparatus for detecting ground faults in electrical systems |
| 08/10/1976 | US3974423 Differential current protective device |
| 08/03/1976 | US3973171 Ground fault circuit interrupting device with grounded neutral detection |
| 07/20/1976 | US3970915 Fault detector and interrupt circuit useful in a television signal processing system |
| 07/20/1976 | US3970901 Method and apparatus for the detection of short circuits |
| 07/20/1976 | US3970899 Integrated circuit linear time delay extender for static relays |
| 07/20/1976 | US3970898 Method of automatically isolating a faulty section of a power line belonging to an electrical energy supply network, and arrangement for carrying out this method |
| 07/20/1976 | US3970897 Detector and apparatus incorporating the same for detecting phase-asymmetry and protecting three-phase motors against dangerous operating conditions |
| 07/13/1976 | US3969635 Voltage condition monitor |
| 07/06/1976 | US3968418 Convertor connection with asymmetry indicating means |
| 07/06/1976 | US3968410 Static overcurrent relays |
| 07/06/1976 | US3968409 Ground fault detector circuit with high current inhibit |
| 06/29/1976 | US3967169 Switching device for the protection of direct current devices |
| 06/22/1976 | US3965469 Annunciator structure and method |
| 06/22/1976 | US3965395 Power interrupter for electrical devices |
| 06/22/1976 | US3965394 Apparatus for protecting a multiphase power transmission line from intermembral faults |
| 06/22/1976 | US3965295 Protective system for stereo loudspeakers |
| 06/15/1976 | US3963964 Segregated phase comparison system |
| 06/15/1976 | US3963963 Ground-fault detection system |
| 06/15/1976 | US3963959 Ground fault circuit interrupting device and differential current sensor therefor |
| 06/08/1976 | US3962694 Method and apparatus for monitoring an electrically actuated tool |
| 06/08/1976 | US3962646 Squelch circuit for a digital system |
| 06/08/1976 | US3962611 Automatic power restart for unattended electrical equipment |
| 06/08/1976 | US3962607 Loudspeaker protective system |
| 06/08/1976 | US3962606 Sensor for a ground fault circuit interrupter |
| 06/01/1976 | US3959984 Motor protection apparatus using fusible links |
| 05/25/1976 | US3959695 Circuit interrupter with ground fault trip control |
| 05/25/1976 | US3959694 Electrical circuit protection apparatus |
| 05/25/1976 | US3959693 Ground fault interrupter apparatus with means protecting against a grounded neutral condition |
| 05/25/1976 | US3959667 Overcurrent trip device |
| 05/18/1976 | US3958153 Method and apparatus for fault detection in a three-phase electric network |
| 05/11/1976 | US3956670 Circuit interrupter circuit including improved control |
| 05/04/1976 | US3955121 Short-circuit protective systems |
| 04/27/1976 | US3953767 Ground fault detection apparatus |
| 04/27/1976 | US3953766 Ground fault circuit interrupter and electronic module therefor |
| 04/13/1976 | US3950742 Adjustable line isolation monitor |
| 04/13/1976 | US3950675 Motor protection device |
| 04/06/1976 | US3949336 Sequential resetting circuit interrupter |
| 04/06/1976 | US3949272 Ground-fault protective scheme for multiple-source electric distribution system |
| 03/30/1976 | US3947728 Network protector relay |
| 03/23/1976 | US3946375 Redundant DC power supply for analog computers and the like |
| 03/23/1976 | US3946281 Overcurrent protection system with variable inverse-time characteristic |
| 03/23/1976 | US3946279 Active impedance multiplier |