Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 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 |
| 7173428 | Portable circuit interrupter shutoff testing device and method A portable circuit interrupter shutoff testing device and method, including a high current switch controlled by a timing circuit that allows current to flow through the switch and a small series resistance (in order to trip the instantaneous-trip function of the int... | 02/06/2007 |
| 6664771 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 12/16/2003 |
| 6486641 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 11/26/2002 |
| 5818126 | Power transfer controller A method and apparatus for controlling power transferred and regulating voltage in a multi-phase transmission line includes generating a first plurality of voltages, a second plurality of voltages displaced in phase from the first plurality of voltages, a... | 10/06/1998 |
| 5466973 | Delivery point voltage regulation in electric energy distribution networks A method for regulating the voltage at which electric energy is supplied at the delivery points in a network for distributing electricity. The voltage of electric energy supplied through a high-voltage network is reduced to a voltage suitable for a medium... | 11/14/1995 |
| 4965508 | Power supply circuit having controllable thyristor network and adjustable voltage regulator A load is supplied by a transformer supplied via a voltage regulator and thyristor network. The thyristor network and regulator are simultaneously controlled to respond to changes in the load and in practice the thryistors respond rapidly and are re-adjus... | 10/23/1990 |
| 4429269 | Feed forward AC voltage regulator employing step-up, step-down transformer and analog and digital control circuitry A feed forward AC voltage regulator utilizes a step-up, step-down transformer to apply adjustment voltages to an unregulated AC line. Analog circuitry periodically samples the unregulated AC line input and compares it with a scaled representation of the d... | 01/31/1984 |
| 4156174 | Phase-angle regulator Phase angle regulator for high voltage power distribution systems. An electrical transformer having inductively coupled series and regulating windings is provided with the series windings connected between a source of electrical power and an electrical lo... | 05/22/1979 |
| 4023090 | Zagreb electrical circuit In an electrical three phase variable power supply fed by three phase alternating power and having a three coil adjustable autotransformer connected in wye across the power lines, the autotransformer having taps associated with each of its coils for adjus... | 05/10/1977 |
