Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7339772 | Hot-swap protection circuit Embodiments of the present invention provide methods and circuitry for protecting a circuit during hot-swap events. Hot swap protection circuitry includes as overcurrent detection circuit which decouples power from a load. Circuitry is provided to detect ground-faul... | 03/04/2008 |
| 7129687 | Transformer over-current protection with RMS sensing and voltage fold-back A method for controlling a power level supplied to a load by an auxiliary output of a power source is presented. The method includes providing a power source having a user-adjustable main output and an auxiliary output. The method further includes providing a contro... | 10/31/2006 |
| 7002304 | Multi-lamp drive device A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound aroun... | 02/21/2006 |
| 6958898 | Flux pump with a superconductor and superconducting electromagnet to be operated therewith A device includes a flux pump and an electromagnet to be fed thereby for the production of highly constant magnetic fields of high field strength. In a flux pump of the rectifier type, switches used are MOSFETs. These MOSFETs include HTc superconductor ma... | 10/25/2005 |
| 6919666 | Adjusting device for displacing individual elements of optical systems or of measuring systems In an adjusting device for displacing individual elements (2) of optical systems or of measuring systems in which the element to be displaced is movable on a base (1) along a predetermined direction (x) by means of a piezoelectric actuator arrangement ... | 07/19/2005 |
| 6838865 | Method and apparatus for branching a single wire power distribution system In a single wire underwater power distribution system, parallel branching nodes are added in a manner that makes the branch connection and branch line look like a series node to the shore based power source. The primary side of a DC—DC converter functioning as an ... | 01/04/2005 |
| 6437302 | Interruptible variable frequency power supply and load matching circuit, and method of design A load matching circuit is disclosed for use with a frequency controlled power supply. The load matching circuit includes an input connectable to the frequency controlled power supply and an output connectable to the load, such as an induction heating coi... | 08/20/2002 |
| 6359424 | Switching circuit for generating pulsed power A switching circuit for generating pulsed power including a plurality of capacitors connected in parallel with first and second output terminals, a plurality of series circuits of a primary conductor and a static induction thyristor connected in parallel ... | 03/19/2002 |
| 6211602 | Actuator using electromechanical transducer capable of being used in high temperature and high humidity environment and apparatus having the same An actuator using an electromechanical transducer capable of maintaining stable driving function even under a severe environment of high temperature and/or high humidity, or the like, and an apparatus mounted with the actuator. The actuator are disclosed ... | 04/03/2001 |
| 5854473 | Induction heating apparatus having an alternating current generator with a saturable choke A ripple current generator for an induction heating apparatus includes a resonant circuit with a current injecting self-inducting coil (6), a capacitor (13), an induction heating coil (14) and a high-frequency controlled power switch (12). The current inj... | 12/29/1998 |
| 5705923 | Variable inductance current limiting reactor control system for electrostatic precipitator A method and apparatus for varying an electrically variable current limiting reactor (VICLR) ( 16) are provided in cooperation with an electrostatic precipitator automatic voltage control system. The inductance of VICLR (16) is varied by altering the DC c... | 01/06/1998 |
| 5059762 | Multiple zone induction heating Induction heating apparatus, e.g. for melting, has induction coil sections, each associated with a respective zone of the melt or other work load, the power applied to each section from a supply being controlled individually through a saturable reactor re... | 10/22/1991 |
| 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 |
| 4737704 | Transformer for arc and plasma setups having broad current adjustment range A variable-ratio transformer for arc and plasma setups, comprising a magnetic core made up of a main part composed of two yokes and legs in accordance with the number of phases and an additional part disposed on the side of the yoke of the main part of th... | 04/12/1988 |
| 4386333 | Universal electrical connection apparatus Different line-cord sets connect an electrical device to different supply voltages, assuring that the supply voltage matches the device. Each line-cord set has a uniquely keyed socket and a wall plug. A device receptacle receives the line-cord's keyed soc... | 05/31/1983 |
| 4335347 | Power combining or dividing arrangements An n-way power combining or dividing arrangement comprising n-transformers and n-input (combiner) or output (divider) terminals and n-balancing loads which are so arranged that the impedance at each input or output terminal remains substantially constant ... | 06/15/1982 |
| 4176310 | Device comprising a transformer for step-wise varying voltages A device comprising a transformer for step-wise varying voltages in which, in order to prevent undesired oscillations in the transformer, a circuit is included in the connection lead thereof, said circuit comprising at least one inductive element and at l... | 11/27/1979 |
| 4066955 | High voltage transformer winding assembly with multiple frequency tuning A high voltage transformer winding assembly is disclosed which enables tuning to preferably provide a rectangular pulse output for improving voltage regulation. The winding assembly comprises a pair of winding subassemblies mounted on opposite legs of a m... | 01/03/1978 |
| 4020412 | High-efficiency transfer of magnetic energy The magnetic energy contained in a storage inductance coil is transferred with a high degree of efficiency into a load impedance which forms part of the same circuit. The transfer is performed gradually in a series of transformations of at least one of th... | 04/26/1977 |
| 3976938 | Superconducting magnetic sensor with improved balancing system A superconducting magnetic sensor having a sensing coil is provided with one or more superconducting discs for adjusting the effective area of the coil. The effective area of the coil is adjusted by varying the position of the superconducting disc relativ... | 08/24/1976 |
