Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7294971 | Balancing transformers for ring balancer A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondar... | 11/13/2007 |
| 6920027 | Fast, variable, and reliable power system controller design A power system controller design for controlling fault current or load flow current by applying a variable inductive impedance. The device comprising multiple stages of transformers connected such that their primary coils are in series and carry the primary power. T... | 07/19/2005 |
| 4977374 | Radiation hardened magnetic voltage and/or current reference produced by a saturable, two core transformer with first harmonic nulling A highly accurate, predictable and stable magnetic voltage and/or current reference that is substantially impervious to potentially hazardous radiation including neutrons, single or multiple particles, ionizing doses, particle beams and the like. The magn... | 12/11/1990 |
| 4896091 | Electric power converter The power converter (10) serves for conditioning an electricity supply for a load (12), whereby the supply is derived from a power source (11) and is adapted to the requirements of the load (12) in respect of the electrical values. The converter (10) comp... | 01/23/1990 |
| 4868481 | Apparatus and method for balancing electrical currents in a multiple-phase system A current balancer for balancing one or more currents provided from a three-phase source to a load includes three current transformer/full-wave rectifier bridge sections and one or more saturable core reactors. Each of the current transformer/full-wave re... | 09/19/1989 |
| 4862059 | Ferroresonant constant AC voltage transformer Primary and secondary windings of each transformer in a three-phase system each form a pair of independent windings, the first winding of each of the primary and secondary pairs formed on the iron core of one of the transformers and the second winding of ... | 08/29/1989 |
| 4853611 | Inductive, electrically-controllable component An inductive component for universal use in any electrical/electronic circuits, whose coefficient of self-induction (L) is independent of the signal, is constant, electrically controllable and can be varied significantly. The component (10) comprises two ... | 08/01/1989 |
| 4849874 | Single mag amp control system for regulating bipolar voltage output of a power converter A power converter embodying the principles of the invention, and having a positive and negative output utilizes a single magnetic amplifier controller to control two saturable inductor cores utilized to regulate the positive and negative outputs by modula... | 07/18/1989 |
| 4785389 | Astable, magnetically coupled multivibrator A multivibrator circuit is provided having two power capacitors C1 and C2 in a power part, a primary winding N1 of a transformer T, as well as two switching transistors Q1 and Q2, and two diodes D3, D4. A positive feedback coupling is provided via the tra... | 11/15/1988 |
| 4583156 | Switching mode power supply using saturable reactors A power supply uses first and second saturable reactor means connected to receive complementary first and second input voltages. The first saturable reactor means is disconnected from the first input voltage when the second saturable reactor means is conn... | 04/15/1986 |
| 4574231 | Magnetic amplifier apparatus for balancing or limiting voltages or currents An apparatus for controlling electrical characteristics in an alternating current system includes a first level of magnetic amplifiers which are responsive to a primary direct current control signal. The magnetic amplifiers provide secondary control signa... | 03/04/1986 |
| 4352026 | Multi-phase current balancing compensator An apparatus which automatically balances the magnitudes of each phase current in a multi-phase power system includes electrical conductors, or phase lines, variable reactance evices, and control elements. Each phase line connects to a variable reactance ... | 09/28/1982 |
| 4328458 | Variable leakage transformer and control circuit therefore A variable leakage transformer having a closed main magnetic path and a closed submagnetic path having a leg common with said main magnetic path. A primary winding is wound on said common leg, and a secondary winding is wound on said main magnetic path. T... | 05/04/1982 |
| 4302805 | Power supply utilizing a high frequency magnetic amplifier A regulated power supply includes an oscillating inverter circuit for generating a high frequency square wave signal that drives a saturable reactor which pulse-width modulates the square wave as a function of a control current through a control winding o... | 11/24/1981 |
| 4167037 | Apparatus for DC/AC power conversion by electromagnetic induction Apparatus for direct current to alternating current power conversion by means of progressive variation of magnetic flux in associated magnetic paths. A direct current input is subdivided into power pulses in two permeance controlled transformers. The puls... | 09/04/1979 |
| 3938030 | Controllable power transferring device utilizing a short-circuited controlled reactance A controllable power transferring device of the type used for controlling or regulating the application of A.C. electric power to a load by means of a reactance controlled by selectively short-circuiting a control coil with a controllable short-circuiting... | 02/10/1976 |
