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 |
| 7345889 | Method and system for reducing radiated energy emissions in computational devices A method and system for reducing the release of high frequency electromagnetic energy into the environment is disclosed, wherein local regions of distributed capacitance are embedded within a printed circuit board (PCB) and adjacent the PCB conductive traces act as ... | 03/18/2008 |
| 7126833 | Auxiliary quasi-resonant dc tank electrical power converter An auxiliary quasi-resonant dc tank (AQRDCT) power converter with fast current charging, voltage balancing (or charging), and voltage clamping circuits is provided for achieving soft-switched power conversion. The present invention is an improvement of the invention... | 10/24/2006 |
| 7054173 | Circuit with DC filter having a link fuse serially connected between a pair of capacitors A circuit that includes a filter and a DC bus is provided that reduces the potential for failure of a second capacitor of the filter in the event a first capacitor shorts. The filter is electrically connected across the DC bus and includes serially connected capacit... | 05/30/2006 |
| 7030769 | Monitor providing cause of trip indication and circuit breaker incorporating the same A circuit breaker with a thermal/magnetic trip device incorporates a monitor that senses the temperature of the bimetal and the amplitude of the load current to distinguish between a thermal and a magnetic trip. If the temperature of the bimetal is above a selected ... | 04/18/2006 |
| 7025245 | Magnetic welder A magnetic welding and joining device is provided. The device has a separable induction coil that can be selectively coupled to provide an induction coil to be positioned around workpieces that are to be magnetically welded or joined. ... | 04/11/2006 |
| 6912108 | Protective equipment for a series-capacitor installation A series-capacitor installation intended to be placed on a platform, insulated towards ground, for connection into a power line (L) for carrying a line current (IL) has a first and a second capacitor group (C1 and C2, respectively). The capacitor group... | 06/28/2005 |
| 6908024 | Simultaneous magnetic pulse framing A method is performed for permanently attaching framing structural members to an underbody of an automotive vehicle. An underbody structural member including one or more cross members and a plurality of metallic structural members are provided at a workstation. The ... | 06/21/2005 |
| 6908023 | Apparatus for securing a yoke to a tube using magnetic pulse welding techniques An apparatus for supporting a workpiece, such as a yoke having a body portion and a pair of opposed yoke arms, during a magnetic pulse welding operation includes a lower jaw, an upper jaw, and a support pin extending therebetween. During the magnetic pulse welding o... | 06/21/2005 |
| 6548769 | Circuit breaker A circuit breaker includes an opening and closing mechanism section with an opening and closing lever, and an alarm-outputting plate operating in response to a tripping operation. A case for the circuit breaker has a plurality of switch housing sections f... | 04/15/2003 |
| 6400538 | Energy storage apparatus for magnetic pulse welding and forming An energy storage system for use in a magnetic pulse welding and forming apparatus includes a bank of capacitors and a very-low inductance conductive bus system interconnecting the capacitors. The bus system provides the ability to generate a very high fr... | 06/04/2002 |
| 6170973 | Method and apparatus for wide-angle illumination in line-scanning machine vision devices A wide-angle illuminator for machine vision applications comprises a fiber optic bundle having a tail end defining a long narrow illumination line adjacent the workpiece and a head end defining a rectangular inlet adjacent the light source. The light sour... | 01/09/2001 |
| 6060946 | Semiconductor device having improved immunity to power supply voltage fluctuations An input buffer circuit is connected to a first power supply voltage pad for applying a first power supply voltage, and a first ground line. An internal circuit larger in power consumption than the input buffer circuit is connected to a second power suppl... | 05/09/2000 |
| 5440442 | Apparatus and method to determine capacitance required to optimize power factor An apparatus and method for optimizing power factor in single phase and three phase installations. Capacitor circuits are interruptably connected with busses by means of switches. Leads electrically connected to the busses are attached to the load leads. ... | 08/08/1995 |
| 5293522 | Ground fault circuit breaker with test spring/contacts directly mounted to test circuit of printed circuit board A ground fault circuit breaker in which both the fixed and movable contacts of the ground fault test switch are directly secured to the printed circuit board on which the ground fault detection circuit is implemented, with the movable contact also providi... | 03/08/1994 |
| 5206775 | Circuit bypass device A circuit bypass device (30) having terminals (70, 80) is connected to contacts (70, 80) of a cell (20) to provide a conductive path (40) in response to voltage excursion therebetween. Device (30) includes: a conductive shunt (40), coupled to contacts (70... | 04/27/1993 |
| 5181154 | Circuit arrangement for optimal current generation in processes of electrochemically initiated plasma-chemical layer production A circuit arrangement for current supply in processes of electrochemically initiated plasma-chemical layer production. It is preferably applied in the plasma-chemical conversion of electrochemically pre-formed layers, e.g. on light metals. The output of t... | 01/19/1993 |
| 5101314 | Protection system for capacitor bank In the protection system for a capacitor bank, a resistor is connected in series between a connection cable for connecting capacitor unit groups in parallel with one another and a short-circuit device provided for each capacitor unit group, by which a fir... | 03/31/1992 |
| 5087999 | Capacitor bank provided with a protective device A capacitor bank comprising a plurality of capacitor units coupled in parallel, and an energy absorbing resistor Rj is inserted in series with each one Cj of the capacitor units. Thus, when a capacitor unit Cj suffers an insulation failure, the energy flo... | 02/11/1992 |
| 5065307 | Apparatus for insulating and preventing noise in the output of a sequence controller A built-in insulating element for electrically insulating a process portion from a control object and for transmitting a process result to the control object is provided in the output portion for transmitting the process result of a sequence controller to... | 11/12/1991 |
| 5063340 | Capacitive power supply having charge equalization circuit A capacitive power supply having a charge equalization circuit. The charge equalization circuit is comprised of a shunt circuit connected in a parallel connection with capacitive elements of the capacitive power supply. Once a charging current is applied ... | 11/05/1991 |
| 4998098 | Overvoltage detector to indicate voltage to a remote monitor An voltage monitoring system including means for providing a voltage from a current and for reducing the voltage. The system also includes means for integrating the current. The integrating means provides an output which increases from an initial conditio... | 03/05/1991 |
| 4975796 | Reverse discharge diode capacitor A device which enables a self-healing capacitor with more than one group of sections in series to undergo repetitive clearing without generating the resulting potential differences between the series sections which causes additional failures. In one embod... | 12/04/1990 |
| 4956739 | Device for locating internal faults in a high-voltage capacitor battery A device to locate internal faults in a high-voltage capacitor battery that has a plurality of symmetrically parallel and series-coupled capacitor banks arranged in parallel branches coupled by shunt branches. The phase angles of the shunt currents flowin... | 09/11/1990 |
| 4805063 | Fault detector for detecting faults in a DC capacitor circuit A fault detector for detecting faults in a DC capacitor circuit connected to the DC buses of an inverter circuit using semiconductor device for converting direct current into alternating current to suppress the voltage pulsation and comprising a plurality... | 02/14/1989 |
| 4750076 | Geometric arrangement for filter capacitors A geometric arrangement for filter capacitors used in high frequency power supplies such that a multiplicity of paralleled capacitors not only share the current but also provide optimum filtering. The terminals of each of the capacitors are connected by e... | 06/07/1988 |
| 4330777 | Device for detecting imminent failure of high-dielectric stress capacitors A device for detecting imminent failure of a high-dielectric stress capacitor utilizing circuitry for detecting pulse width variations and pulse magnitude variations. Inexpensive microprocessor circuitry is utilized to make numerical calculations of digit... | 05/18/1982 |
| 4329638 | Capacitive voltage transformers The present invention refers to capacitive voltage transformers. In accordance with one embodiment a capacitive voltage transformer has two capacitors connected in series between a point on a high voltage line and a reference point such as earth and two impeda... | 05/11/1982 |
| 4326230 | Circuit for monitoring the voltage stress of a capacitor A circuit for monitoring the voltage stress of a capacitor which produces an over-stress indicator signal responsive to the over-voltage history of the capacitor. If the measured voltage stress of the capacitor exceeds a predetermined over-voltage value, ... | 04/20/1982 |
| 4322766 | Monitoring device for the capacitor battery of a d-c filter circuit A circuit for monitoring the capacitor battery of a filter circuit connected to a transmission line, the capacitor battery consisting of at least two parallel legs, each with a number of series-connected capacitors. A first signal is produced which corres... | 03/30/1982 |
| 4295174 | Multi-series group capacitor bank protection equipment A multi-series group capacitor bank has voltage limiters, of the metal oxide type, connected across each individual series group and set at a protection level higher than that of the bank bypass spark gap so the voltage limiters bypass a series group when... | 10/13/1981 |
| 4219856 | Protective device for capacitor bank A protective device for a capacitor bank is coupled to a cross-connection between equipotential points in two sub-banks forming the bank. Current or voltage surges, indicative of a capacitor failure are counted and when a threshold level is exceeded, an a... | 08/26/1980 |
| 4104687 | Device for detecting unbalanced conditions in a polyphase equipment bank A sensing device is connected to an intermediate tap point on each phase leg of a polyphase system such as a grounded wye-connected capacitor bank to detect faulted capacitor units and thereby control a switching device to isolate the capacitor bank. The ... | 08/01/1978 |
| 3984734 | Protective circuit arrangement for a high-voltage capacitor bank A protective circuit for a high-voltage capacitor bank in which the capacitor bank is subdivided into two equal parallel branches with a current measuring device connected in series with each branch and the outputs of the two current measuring devices con... | 10/05/1976 |
| 3973169 | Overvoltage protection for high voltage shunt capacitor banks An integral shunt capacitor bank connected between high voltage AC terminals and comprising a plurality of serially-connected groups of paralleled capacitors is provided with a dual level overvoltage detection circuit between the paralleling buses definin... | 08/03/1976 |
| 3947725 | Protective system for a capacitor voltage transformer Capacitive voltage transformers for measurement of voltage for metering and protective relay purposes on high voltage power transmission systems including a protective system therefor which consists of modifying the inductive value of the inductance in th... | 03/30/1976 |
