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 |
| 7405951 | Switching power supply device A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc1, in which a primary winding 5a of a transformer T, a reactor L3 and a first switch Q1 are connected in ser... | 07/29/2008 |
| 7365501 | Inverter transformer An inverter transformer includes a coil unit including a bobbin and a plurality of windings, and a transformer core unit. The bobbin is formed with a core-receiving compartment, and includes first, second and third coil winding portions. The windings are wound aroun... | 04/29/2008 |
| 7342478 | Structure for high voltage bearable transformers A structure for high voltage bearable transformers is used to electrically connect with backlight driving circuits of liquid crystal display devices. The structure for high voltage bearable transformers is comprised of at least one main bobbin, at least two sets of ... | 03/11/2008 |
| 7301427 | Transformer having auxiliary winding coil for sensing magnetic flux balance and driving circuit using the same A transformer having auxiliary winding coils for sensing magnetic flux balance is disclosed. The transformer comprises a first winding part having a first channel, a second winding part having a second channel a third winding part having a third channel, a primary w... | 11/27/2007 |
| 7218198 | Coil form A coil form for forming an inductive element (10) includes a coil body (2) and at least one, for example three separating plates (3). The coil body (2) has an opening (4.1) and includes two portions, a coil portion (6) and a... | 05/15/2007 |
| 7132812 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around fi... | 11/07/2006 |
| 7102479 | Output choke for D.C. welder and method of using same An output choke for a D.C. arc welder comprising a high permeability core with an inductance controlling air gap defined by first and second pole pieces terminating in first and second surfaces facing each other and each having two spaced edges with an intermediate ... | 09/05/2006 |
| 6987372 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around fi... | 01/17/2006 |
| 6867564 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around fi... | 03/15/2005 |
| 6856230 | Harmonic filtering circuit with special transformer A filter uses a special autotransformer that has a ferromagnetic core with a plurality of legs and flux return bars. A first coil is located on one leg, and a second coil is located on the same leg, but spaced from the first coil. The first coil and at least part of... | 02/15/2005 |
| 6617814 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are woun... | 09/09/2003 |
| 6611187 | Magnetic core, coil assembly and power supply circuit using the same A magnetic core has an open magnetic path and includes a magnetic body forming the open magnetic path and having a soft magnetic property, and a permanent magnet at least at one end of the magnetic path of the magnetic body. A coil assembly includes the m... | 08/26/2003 |
| 6597271 | Electromagnetic apparatus having adjusting effective core gap An electromagnetic apparatus having an adjusting effective core gap includes: (a) an electrical winding; and (b) a ferrous core situated proximal with the electrical winding. The core has a first terminus and a second terminus arranged in spaced relation ... | 07/22/2003 |
| 6232864 | Gap-providing ferrite core half and method for producing same The gap-providing ferrite core half is produced by grinding an abutting surface of a ferrite core half by a rotating grinder with a rotation shaft inclined by 0.1-45° relative to a line vertical to a surface of the ferrite core half to be ground in a pla... | 05/15/2001 |
| 6177855 | Transformers having closed ferrite magnetic circuits A transformer, comprising: a closed ferrite magnetic circuit having an air gap; a rigid component filling a portion of the air gap; and, a flexible material filling the remainder of the air gap to substantially absorb vibrations of the ferrite. In the cas... | 01/23/2001 |
| 6084499 | Planar magnetics with segregated flux paths A planar-type magnetic structure in which two coils, on two poles of the same core, are separated by an open space which is wide enough and low enough that the air return flux, through the open space, completes the flux circuit for each coil. Thus the cou... | 07/04/2000 |
| 6057202 | Method for manufacturing an inductor with resonant frequency and Q value increased in semiconductor process A method for manufacturing an inductor with resonant frequency and Q value increased in semiconductor process can reduce substrate coupling effect, because (an) air layer(s) is/are formed just under a spiral metal layer which functions as an inductor. In ... | 05/02/2000 |
| 6052048 | Method for mounting an electrical coil on a magnetic circuit with an air gap Plane sheets which have the same shape as the magnetic circuit and are relatively movable along their contact surface are arranged in a stack. The stack is grasped and part of the circuit is bent out of alignment with the plane of the sheets to enable a c... | 04/18/2000 |
| 5956073 | Noise-limiting transformer apparatus and method for making Embodiments of the invention include a transformer device having a saturation region for limiting ingress noise and other noise. The transformer comprises a magnetic core, an input coil and an output coil arranged so that the output signal caused by the m... | 09/21/1999 |
| 5926083 | Static magnet dynamo for generating electromotive force based on changing flux density of an open magnetic path A static magnet dynamo including at least one permanent magnet having different poles; a first core comprising a soft magnetic material and which couples the different poles of the permanent magnet to form a closed magnetic path therein; a second core com... | 07/20/1999 |
| 5912553 | Alternating current ferroresonant transformer with low harmonic distortion An AC ferroresonant transformer includes a core having a closed loop path and a magnetic shunt assembly extending between portions of the core. A primary winding, a secondary winding and a tertiary winding are disposed on the core to link with magnetic fl... | 06/15/1999 |
| 5889373 | Fluorescent lamp ballast with current feedback using a dual-function magnetic device A fluorescent lamp ballast utilizes a single a transformer for providing both tank inductance and current mode feedback to the ballast driver circuitry. The transformer has an "EE" core with inductor windings on the center legs and gate windings on one of... | 03/30/1999 |
| 5883559 | Adjustable asymmetric available saturation flux transformer An adjustable asymmetric available saturation flux transformer for a horizontal deflection circuit of a CRT. The transformer includes a core having an asymmetric form, a linear compensation coil and a magnetic saturation control coil. The linear compensat... | 03/16/1999 |
| 5853521 | Multi-cathode electron beam plasma etcher A multi-cathode electron beam plasma etcher is disclosed. The multi-cathode electron beam plasma etcher is comprised of: a vacuum chamber; several cathodes which are installed in the upper end of the upper part of the chamber and generates an electron bea... | 12/29/1998 |
| 5783984 | Method and means for combining a transformer and inductor on a single core structure In a prefer embodiment, an integrated transformer and inductor on a singe core structure to provide an impedance matching function and an inductor in series with the transformer's secondary which includes: a transformer core structure having a primary leg... | 07/21/1998 |
| 5754087 | High-voltage transformer for a television receiver A high-voltage transformer for a television display device having a core made of two core parts. One end of a core limb is chamfered or rounded on the outside such that the contact region is distal from the outer edge of the core limb. The end of the core... | 05/19/1998 |
| 5751205 | High-voltage transformer for a television receiver A transformer to achieve a precise amplitude for the operating voltages produced by the auxiliary windings, and such that the construction and production of the transformer are simplified. An auxiliary winding is split into a plurality of winding elements... | 05/12/1998 |
| 5731666 | Integrated-magnetic filter having a lossy shunt A two-winding, integrated-magnetic EMI filter provides damped common-mode and differential-mode inductances. The preferred embodiment of the filter has a magnetic core structure that incorporates a high-permeability C-core, a high-permeability I-core, and... | 03/24/1998 |
| 5726846 | Trip device comprising at least one current transformer A trip device comprises at least one current transformer for supplying power to electronic circuits. The current transformer comprises a magnetic circuit, surrounding a primary conductor, a secondary winding wound onto a part of the magnetic circuit formi... | 03/10/1998 |
| 5461555 | Flyback converter having a high efficiency irrespective of magnitude of a load In a converter which is usable as a kind of DC--DC converter and which comprises a transformer for processing an exciting current into an excited current under influence of an inductance value of the transformer, the inductance value is controlled in comp... | 10/24/1995 |
| 5400005 | Toroidal transformer with magnetic shunt A transformer or inductor is made by wrapping a magnetic core material about a toroid-like structure made up of one or more electrical windings. A ferroresonant transformer may be constructed by including a slotted washer between primary and secondary win... | 03/21/1995 |
| 5363035 | Phase controlled transformer An operator controllable transformer having a shunt magnetic path with a control coil is provided. The transformer includes phase control circuitry to control the output of the transformer by phase controlling current flow in the shunt coil, thereby contr... | 11/08/1994 |
| 5272831 | Insect extermination and illumination device and operating circuit therefor An electrical circuit is provided for operating a combination insect electrocution grid and outdoor lamp. The circuit of the invention utilizes a high leakage reactance transformer in which a primary coil and two secondary coils are wound on a common core... | 12/28/1993 |
| 5053738 | Magnetic leakage transformer A magnetic leakage transformer includes a paired cores each having five straight legs extending in the same direction from a common back beam, and associated with each other so that the leg's ends are opposed to each other with magnetic gaps between the p... | 10/01/1991 |
| 4952899 | Shunt holding means for ballasts A ballast assembly for a fluorescent lighting fixture includes a magnetic core, a primary winding and a secondary winding, both windings mounted on a central leg of the core, with a shunt disposed between the windings to prevent a flux generated by the pr... | 08/28/1990 |
| 4910482 | AC line filter An AC line filter in which a pair of windings are wound in an opposite dition to each other and are provided at opposing locations on a main core that forms a closed magnetic path. At least one auxiliary core which forms a shorter magnetic path than the ... | 03/20/1990 |
| 4874990 | Notch gap transformer and lighting system incorporating same The invention is directed to a transformer having notch gaps extending partially across the flux path of the transformer core and having a total gap volume which stores sufficient magnetic energy to substantially eliminate inductive voltage spikes in a cl... | 10/17/1989 |
| 4857876 | Shunt latch A shunt latch for a core-coil of a fluorescent light ballast comprising a substantially U-shaped metal shunt which is positioned in a shunt-receiving compartment defined by a pair of adjacent flanges. The adjacent flanges are provided with barb-like protr... | 08/15/1989 |
| 4812798 | Electric transformer for microwave ovens The invention provides an electric transformer for microwave ovens including a conventional magnetic circuit with three columns, and electric circuits insulated by carcases and covers made from an insulating material. The secondary carcase forms a particu... | 03/14/1989 |
| 4795959 | Harmonic inductor for generation of an energy conserving power wave An energy convertor for generating a power output waveform that contains a fundamental sine wave and a controlled amount of the third harmonic wave to eliminate the sinusoidal peaks and to provide a desired flat top at reduced amplitude. The synchronized ... | 01/03/1989 |
