Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7889463 | Fused lead wire for ballast protection A ballast having fused leads protects against uncommon, but harmful, ballast failures. The fused leads prevent a current in the primary coil of the ballast from exceeding a potentially damaging value. A thermal protector shorts the primary ballast coil if the temper... | 02/15/2011 |
| 7777994 | Device for preventing the explosion of an element of an electrical transformer A device for preventing the explosion of an element of an electrical transformer provided with a tank containing a combustible cooling fluid, comprising a pressure release element for decompressing the tank, and a bag placed downstream of the pressure release elemen... | 08/17/2010 |
| 7342474 | Circuit breaker configured to be remotely operated A circuit breaker configured to be remotely operated is disclosed. The circuit breaker includes a set of main contacts configured to connect between an electrical source and an electrical load, an operating mechanism in operable communication to open and close the m... | 03/11/2008 |
| 7323852 | Sensing load tap changer (LTC) conditions A load tap changer (LTC) having a plurality of windings is coupled to one of the primary and secondary of a power transformer in order to regulate the output voltage of the transformer. The LTC includes a plurality of taps physically and electrically connected to an... | 01/29/2008 |
| 7317598 | Electric transformer explosion prevention device A device for preventing the explosion of an electric transformer equipped with a tank filled with combustible coolant fluid, includes a pressure relief element to decompress the tank, a reservoir arranged downstream of the pressure relief element and at least one st... | 01/08/2008 |
| 7301742 | Method and apparatus for accessing and activating accessory functions of electronic circuit breakers An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and ac... | 11/27/2007 |
| 7253637 | Arc fault circuit interrupter system In order to determine whether arcing is present in an electrical circuit, a sensor signal corresponding to current in said electrical circuit is processed. The sensor signal is filtered to determine the presence of noise in a predetermined frequency range and produc... | 08/07/2007 |
| 7222518 | Transformer monitoring system An oil-filled transformer monitoring system is provided which calculates an oil temperature of an oil-filled transformer with high precision from a current of the transformer and an ambient temperature. The oil-filled transformer monitoring system of this invention ... | 05/29/2007 |
| 7154061 | Interrupter assembly for a circuit breaker A preferred embodiment of an interrupter assembly for a circuit breaker includes a first contact, a conductor, and a second contact mounted on the conductor. The second contact and the conductor are movable in relation to the first contact between a first position w... | 12/26/2006 |
| 7151656 | Arc fault circuit interrupter system A system for determining whether arcing is present in an electrical circuit in response to a sensor signal corresponding to current in the circuit includes a circuit for analyzing the sensor signal to determine the presence of broadband noise in a predetermined rang... | 12/19/2006 |
| 7145760 | Tap changer monitoring A method and means for diagnosing transformer tap changers is provided. Pressure is monitored in an insulating liquid of a tap changer for a period of time in which switching of the tap changer is carried through. Switching-related information is extracted from the ... | 12/05/2006 |
| 7136265 | Load recognition and series arc detection using bandpass filter signatures A method and system for determining whether arcing is present in an electrical circuit includes sensing a change in an alternating current in the circuit and developing a corresponding input signal, analyzing the input signal to determine the presence of broadband n... | 11/14/2006 |
| 7068480 | Arc detection using load recognition, harmonic content and broadband noise A method of determining whether arcing is present in an electrical circuit includes sensing a change in current in the circuit and developing a corresponding input signal, analyzing the input signal to determine the presence of broadband noise in a predetermined ran... | 06/27/2006 |
| 6926204 | Secure electronic device This invention relates to a secure electronic device comprising: at least an electronic circuit (10) containing information to be protected, an energy source (11); at ... | 08/09/2005 |
| 6847187 | Detection of loss of cooling air to traction motors A thermal protection apparatus for an AC traction motor including a stator, a rotor, a blower fan and an inverter includes a method and apparatus for predicting the motor temperature assuming that the blower is operational. The method and apparatus also determines a... | 01/25/2005 |
| 6804092 | Device for prevention against explosion of electrical transformers Device for prevention against explosion of an electrical transformer comprising an enclosure filled with combustible coolant, and a means for decompressing the enclosure of the transformer. The decompression means comprises a rupture element 1 with integrated... | 10/12/2004 |
| 6714022 | Apparatus and method for cooling power transformers The load current drawn from a power transformer is sensed to determine if and when the load current exceeds a predetermined threshold. The length of time the load current exceeds the threshold is also sensed. By monitoring the excess current flow and the length of t... | 03/30/2004 |
| 6662122 | Method for the controlled proportioning of liquids while dislocating a gas cushion A method for controlled proportioning of liguids with a postive-displacement device (2) for dislocating a gas cushion (17) includes measuring the pressure (pab) in the gas cushion (17) at the time of a complete discharge of a liquid volume, mea... | 12/09/2003 |
| 6567249 | Transformer with electrical isolation protection and power supply unit or voltage converter with a transformer of this type A invention relates to a transformer having a primary coil and a secondary coil, with a ferromagnetic core inserted in a coil former. The alternating current resistance of the primary coil (3) drops on reaching a triggering temperature (TC) which lies abo... | 05/20/2003 |
| 6144160 | Lamp with a temperature-controlled automatically protecting circuit A lamp with a temperature-controlled automatically protecting circuit which includes a temperature induction circuit and a sampling circuit with its input end to connect with an output end of the temperature induction circuit, wherein the temperature cont... | 11/07/2000 |
| 5949343 | Supervisory apparatus for oil-filled electrical equipment There is provided at least one pressure detector for detecting a change in pressure of an insulating medium, a vibration detector for detecting vibration of an oil-filled electric equipment, and a determination processor for determining, based on informat... | 09/07/1999 |
| 5946171 | Method and device for prevention against explosion and fire of electrical transformers An electrical transformer which is filled with a combustible coolant may experience a break in the electrical insulation within the transformer. This break in the electrical insulation may lead to an explosion or fire. A pressure sensor and a vapor sensor... | 08/31/1999 |
| 5898556 | Protection system for a three-phase distribution transformer insulated in a liquid dielectric A protection system for a three-phase distribution transformer immersed in a liquid dielectric contained in a tank, at least two of the three phases being equipped on the high voltage side of the transformer with respective current-limiting fuses. On each... | 04/27/1999 |
| 5717257 | Thermal switch for electrical load An electrical load, such as a motor, has a first and a second terminal element for supplying electricity to the load. The second terminal element is directly connected to the load whereas the first terminal element together with a further terminal element... | 02/10/1998 |
| 5625520 | Device for preventing a high voltage transformer of a microwave oven from being overheated Disclosed is a device for preventing a high voltage transformer of a microwave oven from being overheated, which directly senses a temperature in a second coil of the high voltage transformer of the microwave oven and thereby supplies or cuts off power to... | 04/29/1997 |
| 5534853 | Electronic apparatus for measuring the parameters of an oil transformer The invention relates to an electronic apparatus fastened on an oil transformer, which measures with precision, continuously and simultaneously the value of the temperature, of the level of the dielectric liquid contained in the transformer, of the pressu... | 07/09/1996 |
| 5463522 | Housing and mounting arrangement for thermal protector device A housing of electrical insulating material for a thermal protector used with an inductive device, such as a ballast transformer, in which the housing has an open portion through which the case of the thermal protector is accessible to be placed adjacent ... | 10/31/1995 |
| 5436511 | Apparatus for interrupting supply of power from power system to portion of consumer load in response to control signal from power system A consumer load receiving power from a power system is divided into a first load to which power may be interrupted if necessary to reduce demand on the power system, and a second load to which power supply may not be interrupted to reduce demand on the po... | 07/25/1995 |
| 5388451 | High voltage transmission switching apparatus with gas monitoring device A high voltage switching apparatus 10 is described containing an arc-quenching gas containing sulphurhexafluoride in a vessel 12 that is monitored by a gas monitoring device 20. A temperature transducer 34 is attached to the exterior of the vessel 12 to s... | 02/14/1995 |
| 5303160 | Load controller with digitally modeled overload protection and analog tracking of heat state during power off Microprocessor based apparatus for controlling an electrical load, such as a motor, includes an external capacitor for storing an analog equivalent of a digitally modeled heat state signal, such as the I2 t characteristic of the motor. The volt... | 04/12/1994 |
| 5078078 | Transformer internal fault warning indicator A warning indicator provides an indication that a transient over-pressure condition has occurred in a transformer. The indicator takes into account small or slow pressure changes and only indicates pressure surges. The internal arcing warning indicator co... | 01/07/1992 |
| 4951168 | Transformers having overload protection A 60 VA transformer is described. A recycling circuit breaker mounted on and connected in series with the secondary winding of the transformer preserves the integrity of the transformer and permits its continued use after a short circuit. A thermal fuse m... | 08/21/1990 |
| 4903160 | Sudden, pressure relay supervisory apparatus Apparatus for the supervision of a sudden pressure relay (SPR) system which protects a power system network transformer having a plurality of windings associated with each phase of the power system network. This apparatus overcomes the difficulties associ... | 02/20/1990 |
| 4823224 | Rapid pressure rise circuit An electronic relay control circuit is provided for liquid cooled electric power transformers. The control circuit senses the rate of change of internal tank pressure and operates its relays in response to a sudden pressure increase. Relay control connect... | 04/18/1989 |
| 4799166 | Apparatus for automatically analyzing gases in oil An apparatus for automatically analyzing gases in oil, wherein a gas analyzer analyzes the total quantity of combustible gases extracted from the oil or the quantities of several specified ones of the combustible gases, comprising a data processor determi... | 01/17/1989 |
| 4796143 | Electric transformer for underground mining machine A transformer for use on an underground mining machine, such as a shearer loader. The transformer is cylindrical in shape and contains a central cavity extending therethrough to allow positioning of the transformer about a drive shaft of the motor of the ... | 01/03/1989 |
| 4754405 | Tri-phase electronic temperature controller A method and system for indicating and controlling the temperature of liquid cooled multi-phase power transformers. The winding temperatures of a transformer are electronically computed from the actual top oil temperature and the incremental additional te... | 06/28/1988 |
| 4745571 | Modular electronic temperature controller A method and system for controlling the temperature of liquid cooled power transformers. The winding temperature of a transformer winding is electronically computed from the actual top oil temperature and the incremental additional temperature resulting f... | 05/17/1988 |
| 4737878 | Overload switch In a transformer primary circuit breaker having a primary switch for opening and closing the transformer primary circuit, an operating handle mounted exteriorly of the transformer for opening and closing the primary switch, a trip mechanism operatively co... | 04/12/1988 |
| 4709291 | Protective device for preventing blowout of bushing in high-voltage switching installation For protecting service personnel during maintenance work on a metal-encapsulated, compressed-gas-insulated high-voltage switching installation, a protective device is provided which is used if gas spaces with voltage-carrying conductor parts are bounded b... | 11/24/1987 |
