Celebrity Inventors
Glam girl Heddy Lamar may have used her good looks to good effect on the silver screen, but she put her smarts to better use as an inventor. During World War II, she co-patented a frequency-switching system for torpedo guidance that was considered years ahead of its time.
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| Number | Title | Issue Date |
| 8081411 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 12/20/2011 |
| 7808758 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 10/05/2010 |
| 7688562 | Status relay including a current switch Low current electrical devices can be protected by a status relay having an active current sensing circuit that includes a current switch. ... | 03/30/2010 |
| 7684164 | Automatic power-off protection apparatus An automatic power-off protection apparatus includes an alternating current (AC) input; an AC output connected to the AC input via power wires that comprises a naught wire and a live wire; a switching unit for enabling and disabling a connection between the AC input... | 03/23/2010 |
| 7626798 | Electronic load control unit (ELCU) used as bus tie breaker in electrical power distribution systems The present invention provides an electrical power distribution system that includes a first primary distribution panel (PDP) connected to a first source of electrical power and a second PDP connected to a second source of electrical power. The second PDP is connect... | 12/01/2009 |
| 7609497 | Residual-current-operated protective device A switching device for disconnecting and switching at least one line of a power supply is disclosed. The switching device may be, for example, a residual-current-operated protective device or a combination switch and includes a line-voltage-independent trigger devic... | 10/27/2009 |
| 7548404 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 06/16/2009 |
| 7477501 | System and method of mounting current transducers in proximity to circuit breakers The present disclosure provides a method and system for mounting a current transformer in proximity to a circuit breaker of an electrical system. Generally, a sensor assembly contains a plurality of current transformers (CTs) for measuring power wires from a main po... | 01/13/2009 |
| 7372687 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 05/13/2008 |
| 7368882 | Self-contained, self-snubbed, HID dimming module that exhibits non-zero crossing detection switching A protection circuit for an HID dimming circuit is provided. A resistive component limits the initial current after a relay closes and current flows from a charged capacitor to a second capacitor. An inductive component limits the rate of change of current through t... | 05/06/2008 |
| 7362556 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 04/22/2008 |
| 7336193 | Device for monitoring the leakage current of a surge arrester A device for monitoring a leakage current of a surge arrester has a measuring element for detecting a leakage current in a leakage current circuit. A filter assembly filters the leakage current in order to extract a third harmonic oscillation which is evaluated by a... | 02/26/2008 |
| 7330342 | Safety tester having a high-voltage switching relay protected by an in-line electronic circuit breaker A multiple function safety compliance test instrument includes a high voltage output switching relay protected by a solid state in-line circuit breaker. ... | 02/12/2008 |
| 7304829 | Apparatus and method for filtering current sensor output signals An electronic filter for filtering the output signal of a current sensor of a circuit breaker is disclosed. The current sensor has an output signal characteristic similar to that of a Rogowski coil output signal characteristic that includes a third harmonic noise co... | 12/04/2007 |
| 7268987 | Motor starter device A motor starter device having an elongated base provided with power poles acted upon by a contactor part and a protection part. The base houses power current lines 15 and their control mechanism 20. Two movable linkages (30, 40) are associated w... | 09/11/2007 |
| 7227729 | Arc fault detection technique An apparatus and a method of detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, a differential current input sense circuit, a differential current (di/dt) characteristics sense circuit, an absolute cu... | 06/05/2007 |
| 7221548 | Residual-current circuit breaker and a method for testing the reliability performance of a residual-current circuit breaker A test circuit is provided, which is independent of a power supply and which enables a circuit breaker to be tested in a reliable manner. The test circuit includes a test coil which is devoid of electric potential and is wound around a totalizing current transformer... | 05/22/2007 |
| 7206177 | Device and method for protection against overcurrents in an electrical energy distribution cabinet The invention relates to a device for protection against overcurrents in an electrical energy distribution cabinet which receives electrical energy supplied by at least one generator and which distributes this energy to at least two loads, which comprises: ... | 04/17/2007 |
| 7203047 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 04/10/2007 |
| 7193829 | Combination current sensor and relay A protection device for monitoring current in a power cable to an electrical device and for controlling a remotely located starter for the electrical device in response to a system controller. The device includes a transformer magnetically linked with the power cabl... | 03/20/2007 |
| 7177129 | Circuit breaker having a microprocessor-controlled tripping device and a bypass circuit A circuit breaker includes current detectors, a microprocessor-controlled tripping device, and a bypass circuit that interacts with a watchdog circuit that monitors the proper functioning of the microprocessor. A switchable reference voltage is made available to the... | 02/13/2007 |
| 7129653 | Self-contained, self-snubbed, HID dimming module that exhibits non-zero crossing detection switching A protection circuit for an HID dimming circuit is provided. A resistive component limits the initial current after a relay closes and current flows from a charged capacitor to a second capacitor. An inductive component limits the rate of change of current through t... | 10/31/2006 |
| 7123461 | Method and device for monitoring switchgear in electrical switchgear assemblies The invention relates to a method, a computer programme and a device (2) for determining contact wear in an electrical switchgear (3) in an electric switchgear assembly (1) as well as to a switchgear assembly (1) with such a device (2 | 10/17/2006 |
| 7085116 | Overload current protection device using magnetic impedance element In an overload current protection device for cutting off power from a power supply to a load (3) such as a motor by means of a contactor (switch) (2) at overloading, an MI element having a magnetic impedance (MI) effect as current detectors (4 | 08/01/2006 |
| 7064946 | Electronic fuse An electronic fuse comprising an integrated circuit having a control output terminal coupled to a control electrode of a power semiconductor switching device, the power semiconductor switching device being coupled in series with a load between first and second poten... | 06/20/2006 |
| 7046530 | Method and apparatus for current limiting of an output of a DC-to-DC converter A method for current limiting of an output of a DC-to-DC converter begins by determining a current loading duty cycle of the output of the DC-to-DC converter (i.e., the present duty cycle given the loading of on the output). The processing then continues by comparin... | 05/16/2006 |
| 7042161 | Ballast with arc protection circuit FA ballast (20) for powering a gas discharge lamp (70) comprises an inverter (200) and an arc protection circuit (600). Arc protection circuit (600) monitors an electrical signal within the ballast. In response to occurrence of a d... | 05/09/2006 |
| 7005844 | Measuring circuit arrangement for electricity meters for direct connection A measuring circuit arrangement (1) for an electricity meter for direct connection is respectively connected, to an input (3) for voltage measurement and an input (4) for current measurement of a measuring chip (2) for each phase of a thr... | 02/28/2006 |
| 6977445 | Three phase rectifier circuit with virtual neutral A rectifier circuit powers three power conversion modules using a three phase AC input without a neutral connection. The rectifier circuit includes a first bridge rectifier that is connected to a first phase of the three phase AC input and that produces a first rect... | 12/20/2005 |
| 6956728 | Method and apparatus to control modular asynchronous contactors A modular asynchronous contactor assembly includes a contactor for each phase or pole of an electrical device. The contactor assembly is applicable as both a switching device and an isolation or load protection device. As such, each contactor is constructed so that ... | 10/18/2005 |
| 6900972 | Circuit interrupter with improved surge suppression A suppression and protection circuit is used in conjunction with a circuit interrupter. In one configuration, a voltage clamping device such as a metal oxide varistor is utilized in a ground fault circuit interrupter product for handling transient surges and overvol... | 05/31/2005 |
| 6879479 | Current detector for surge arrester diagnostic and overvoltage assessment in high voltage substations An apparatus for sensing and measuring the HV surge arrester current includes two toroidal current transformers arranged coaxially with respect to the earth wire of the surge arrester, elements for sensing the current signals emitted by the transformers and for conv... | 04/12/2005 |
| 6873504 | System and method for detecting loss of phase in a compressor system A system for detecting loss of an electrical phase in a compressor system includes a compressor system component having a plurality of phase carrying legs; a sensor for measuring current communicated with one leg of the plurality of phase carrying legs; and a proces... | 03/29/2005 |
| 6873263 | Water leak detection A battery powered water leak detector and audible alarm are held on a credit card sized plastic board that has sufficient unobstructed area for visible messages, such as advertising, to be printed of otherwise affixed thereon. ... | 03/29/2005 |
| 6842319 | Procedure for producing an initiation signal after the current differential protection principle arrangement The invention relates to a method and arrangement for generating a trigger signal according to the current differential protection principle when a fault occurs on a section of an electrical power supply system, in which differential current values and stabilization... | 01/11/2005 |
| 6788512 | Electronic trip unit capable of analog and digital setting of circuit breaker setpoints A trip unit is provided with a microcontroller and non-volatile memory, such as EEPROM (Electrically Erasable Programmable Read Only Memory) or Flash memory, for storing trip setting values, including initializing parameters, boot code, and operational parameters be... | 09/07/2004 |
| 6757146 | Instantaneous overcurrent element for heavily saturated current in a power system The instantaneous overcurrent element, used in a microprocessor-based protective relay for a power system, includes a finite impulse response filter which generally is a cosine filter and is responsive to the current waveform from the current transformer for fault d... | 06/29/2004 |
| 6754059 | Multi-pole low voltage circuit breaker with one current measuring device per line A current measuring device for a multi-pole voltage circuit breaker includes a support body with a through opening for a current conductor for each of the poles and a receiving chamber, surrounding the through opening for secondary components of current sensors and/... | 06/22/2004 |
| 6747860 | Power-supply feedthrough protection circuit for 5-volt failsafe CMOS drivers A power supply feedthrough protection circuit which solves the problem of voltage feedthrough from a bus cable charging a chip power-supply beyond acceptable transistor limits. The circuit continuously senses the chip power-supply, compares the supply to an acceptab... | 06/08/2004 |
| 6724597 | Protection device for low voltage networks A protection device includes a measurement device that is a current transformer which is based on a printed circuit, and an evaluation device that is a unit for early short-circuit identification. The current transformer, which is based on a as printed circuit board... | 04/20/2004 |
