Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7732944 | Central current share coordinator, method of current sharing and battery plant employing the same The present invention provides a central current share coordinator for use with remotely and non-remotely controllable rectifiers coupled to an output bus. In one embodiment, the central current share coordinator includes a rectifier current resolver configured to d... | 06/08/2010 |
| 7342326 | Circuit arrangement for momentarily maintaining an internal operating direct current voltage in the event of an interruption in the vehicle electrical system power supply voltage A circuit arrangement, to which the vehicle electric system supply voltage is applied and which for briefly maintaining at least one internal normal d.c. voltage in the event of failure of the vehicle electric system supply voltage, includes a reserve energy accumul... | 03/11/2008 |
| 6870282 | Method for the transmission of signals in a bus system, superposed on a direct supply voltage Previously in a bus system, voltage signals were transmitted from the central unit to the modules, which could reply thereto by variation of the current input. A disadvantage thereby is the relatively high susceptibility to interference of the current input, which i... | 03/22/2005 |
| 6294404 | Semiconductor integrated circuit having function of reducing a power consumption and semiconductor integrated circuit system comprising this semiconductor integrated circuit A semiconductor integrated circuit according to the present invention comprises a synchronous SRAM, a signal generation circuit generating a chip selection signal, a clock signal etc. supplied to the synchronous SRAM, a voltage set circuit setting the vol... | 09/25/2001 |
| 5717303 | DC motor drive assembly including integrated charger/controller/regenerator circuit A drive assembly comprises a DC electric motor and an integrated charger/controller/regenerator which includes a power module, a step-up module and a control circuit. The input of the power module is connected to an electric power source during charging, ... | 02/10/1998 |
| 5182463 | 3-Phase converter apparatus A 3-phase converter apparatus, in which a 3-phase A.C. power supply and a 3-phase converter operate in parallel on a common load BUS so as to share the load power, has an output voltage command generating device for generating an instantaneous command of ... | 01/26/1993 |
| 5087872 | Circulating load apparatus A circulating load apparatus for loading a power supply. The power supply has a power input terminal, a power output terminal and a power return terminal. The power supply provides an output voltage at the power output terminal with respect to the power r... | 02/11/1992 |
| 4731690 | Real load unbalance protection system for parallel variable speed constant frequency electrical power systems A method for sensing real load unbalance in an electrical power system having at least two clock based power sources which are connected for parallel operation combines a real load difference current signal, proportional to the difference in real load cur... | 03/15/1988 |
| 4651019 | Dual fueled thermoelectric generator A dual fueled thermoelectric generator wherein two different sources of energy are provided. The first source of energy is electrical energy which is tapped from an overhead transmission ground wire and converted into thermal energy by electric resistance... | 03/17/1987 |
| 4529973 | School cafeteria sound level monitor Three distinct visual indications, one audible indication, and preferably one timing output voltage are provided which are individually activated depending upon when the sound levels falls within a predetermined level. This monitor aids both students and ... | 07/16/1985 |
| 4449057 | Solar cell power supply device There is disclosed a solar cell power supply device including a first and a second solar cells. The first cell has a determined spectral sensitivity characteristic and the second cell has a different spectral sensitivity characteristic and connected paral... | 05/15/1984 |
| 4444905 | Hydrotreating catalyst preparation and process Hydrotreating catalysts are prepared using multiple impregnation and a critical ratio of VIB metal to VIII metal in one or more stages to produce catalysts which have higher than normal activity in contaminant removal from hydrocarbon feed stocks, especia... | 04/24/1984 |
| 4398143 | Remote supply circuit for analog two-wire connection This circuit comprises at least one power supply inserted between the earth and each of the two wires of the connection, two RC series dipoles in each case inserted between the earth and the two wires and a circuit able to fix to the earth the average pot... | 08/09/1983 |
| 4160941 | Multi-purpose battery charger A multi-purpose battery charger is disclosed, capable of simultaneously charging multiple batteries to a common peak voltage and operable from either an A.C. source of power or a D.C. source of power. The power supply portion of the battery charger includ... | 07/10/1979 |
| 4156150 | Circuit for regulating a DC voltage on which a large AC voltage is superimposed Disclosed is a ringing power supply for developing a ringing signal having an AC voltage combined with a regulated DC voltage, of magnitude smaller than the magnitude of the AC voltage, from a source having the AC signal combined with an unregulated DC vo... | 05/22/1979 |
| 4048513 | Rectifier controlled circuit An electrical circuit providing for equal power consumption by the included oad elements when selectively energized by independent power sources of differing voltages, through control of the path of current flow through the load elements by rectifiers, the... | 09/13/1977 |
