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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7352270 | Printed circuit board with magnetic assembly A magnetic assembly including a printed circuit board and a core made from magnetically permeable material positioned on the printed circuit board. Plated through holes are formed in the printed circuit board, a first plated through hole on a first side of the core,... | 04/01/2008 |
| 7315463 | Apparatus and method for multi-phase transformers A method and apparatus for multi-phase transformers are described. In one embodiment, a coupled inductor topology for the multi-phase transformers comprising N primary inductors. In one embodiment, each primary inductor is coupled to one of N input nodes and a commo... | 01/01/2008 |
| 7292128 | Gapped core structure for magnetic components A single piece core structure for magnetic components that is formed without utilizing insulating spacer materials and bonding materials. ... | 11/06/2007 |
| 7271691 | Method of winding coil and transformer and inverter liquid crystal display having coil wound using the same A method of winding a coil of a transformer in an inverter of a liquid crystal display including a bobbin wound with a coil and a core introduced into the bobbin, the method includes forming a coil winding part having no protrusion member at the bobbin so as to excl... | 09/18/2007 |
| 7170385 | Inductive proximity sensor and method of assembling the same An inductive proximity sensor comprises: a housing including an opening on one side; an inductive core including two legs, each core leg including a foot portion; an inductive coil wound bobbin disposed about each leg of the core, each bobbin including an integral l... | 01/30/2007 |
| 7164340 | Transformer for switching power supply A transformer is constituted of an inner core, a plurality of outer cores connected in a ring to the inner core, a primary winding which is fed with a high frequency wave and wound around the inner core, and a secondary winding wound outside the primary winding. The... | 01/16/2007 |
| 6998573 | Transformer module for a welder An electric arc welder comprising a high switching frequency inverter for driving the primary of an output transformer where the output transformer has a plurality of modules forming the secondary windings of the transformer and each of the modules comprises a first... | 02/14/2006 |
| 6952153 | Electrical transformer An electrical transformer having primary winding segments and secondary winding segments interconnected, respectively, by first and second multilevel printed circuit boards disposed in a pair of overlaying planes and additional segments disposed perpendicular to the... | 10/04/2005 |
| 6667680 | Circuit breaker A circuit breaker includes a handle having OFF, ON and intermediate positions, and an extension. A blocking disk has a spring, and first, second and third surfaces. The handle and disk are co-pivotally mounted. The extension engages the third surface for ... | 12/23/2003 |
| 6437555 | Inductive sensor for measuring a current in a conductor An inductive sensor for measuring a current in a conductor includes a generally annular winding (10) delimiting a passage for the conductor. The winding extends homogeneously over most of the circumference of a ring except for a section (20) where the win... | 08/20/2002 |
| 6242995 | Bead inductor and method of manufacturing same A method of manufacturing a bead inductor includes the steps of forming a molded body of a resin material or a rubber material including a powdery magnetic substance with a conductor coil defined by a wound, coated metallic wire; cutting both ends of the ... | 06/05/2001 |
| 5999078 | Transformer and rectifier module with half-turn secondary windings A transform-rectifier module has a one-half turn secondary winding installed with very short, direct connections to four rectifiers. The core of the transformer has two parallel through holes. The secondary winding comprises two "Y" shaped windings. The "... | 12/07/1999 |
| 5945902 | Core and coil structure and method of making the same An inductive device is comprised of a plurality of dielectric wafers having conductive patterns disposed thereon and being formed into a laminate structure. The laminate structure includes a ferromagnetic core encased within the dielectric material. The c... | 08/31/1999 |
| 5896079 | High frequency common mode ferrite bead Common mode ferrite bead is provided for suppressing EMI/RFI. The bead includes a ferrite body of substantially rectangular configuration with top and bottom surfaces, first and second end surfaces and first and second side surfaces. Six apertures pass en... | 04/20/1999 |
| 5815062 | Magnetic core In the magnetic core including a first leg portion around which a wire is wound, a second leg portion for circulating a magnetic flux generated in the first leg portion, and a web portion connecting the first leg portion and the second leg portion, a magn... | 09/29/1998 |
| 5705961 | Induction device for high radio frequency signal distributor An induction device for high radio frequency signal distributor which is able to act as a right signal distributing induction device on the right side of the high radio frequency signal distributor and act as a left signal distributing induction device on... | 01/06/1998 |
| 5032815 | Lamination type inductor A lamination type inductor has a plurality of ferrite sheets assembled one above the other and laminated together, the uppermost and lowermost sheets being end sheets having lead-out conductor patterns thereon and conductor patterns on the surfaces of the... | 07/16/1991 |
| 5032808 | R.F. choke for CATV system A radio frequency choke for a cable or CATV system is designed for blocking signals from 5 to 1000 MHz and passing 60 Hz AC power. The RF choke has a wire coil that is wound upon a coil form of a predetermined cross section, the coil being formed of a num... | 07/16/1991 |
| 4940921 | Combination ballast and cold cathode sealed lamp and method A miniature, light weight, high voltage, high frequency, high power output unique ballast and a unique sealable neon lamp in a light weight, light reflective box containing the ballast for use as one of a plurality of ceiling lamps. The ballast includes a... | 07/10/1990 |
| 4849649 | Electric pulse generator of the type with a saturatable inductance coil Electric pulse generator having at least one capacitor in the form of a coaxial line section and a saturatable inductance coil serving as a switch. According to the invention, the saturatable inductance coil is located within the internal conductor of the... | 07/18/1989 |
| 4459653 | Apertured transformer and inverter using same A bifluxer type transformer for use in a static inverter utilizes an E-E or shell-type core. Such configuration is particularly suitable for ballasting hid lamps because it minimizes stray flux which causes eddy current losses in the luminaire metal enclo... | 07/10/1984 |
| 4447795 | Laminated grid and web magnetic cores A laminated magnetic core characterized by an electromagnetic core having core legs which comprise elongated apertures and edge notches disposed transversely to the longitudinal axis of the legs, such as high reluctance cores with linear magnetization cha... | 05/08/1984 |
| 4398156 | Switching power pulse system A switching system for delivering pulses of power from a source (10) to a load (20) using a storage capacitor (C3) charged through a rectifier (D1, D2), and maintained charged to a reference voltage level by a transistor switch (Q1) and voltage comparator... | 08/09/1983 |
| 4394636 | Structure of a transformer A transformer having a main winding and a control winding has a pair of E-shaped cores (10, 11), and an I-shaped third core (13) positioned on one E-shaped core (10). A small groove (14) is provided on the base plate (10c) of the first E-shaped core (10).... | 07/19/1983 |
| 4307334 | Transformer for use in a static inverter A novel and economical transformer is described for use in a static inverter in association with one or two switching devices, typically transistors. The transformer produces an output for control of the associated switching device(s) which changes in sen... | 12/22/1981 |
| 4259716 | Transformer for use in a static inverter A novel transformer is described for use in a static inverter in association with one or two switching semiconductor devices. The transformer produces an output for control of the associated switching device(s) which changes in sense from conduction aidin... | 03/31/1981 |
| 4249229 | Transformer having novel multiple winding and support structure and method of making same Electrical apparatus includes electrical coil means formed of multiple turns of enamel-covered electrical wire axially mounted on a core of magnetic material in electromagnetic energy coupling relationship therewith, and a relatively flat flexible electri... | 02/03/1981 |
| 4206434 | Regulating transformer with magnetic shunt A regulating power transformer has a DC-shunt control arranged so that coupling between the primary and secondary windings of the transformer over substantially the entire range from 5% to 95% of rated line input may be achieved, with low harmonic compone... | 06/03/1980 |
| 4202031 | Static inverter employing an assymetrically energized inductor A static inverter employing an inductor and an electrical gain element for intermittent assymetric energization of the inductor from a dc source is described. Reliable intermittent operation of the gain element, typically a power transistor, is achieved b... | 05/06/1980 |
| 4158156 | Electron ballast apparatus for gaseous discharge lamps Electronic ballast apparatus includes a transformer having an "E"-shaped core member with a primary winding wrapped on a center leg member and coupled to a potential source and first and second secondary windings each wrapped on a first and second outer l... | 06/12/1979 |
| 4146210 | Hoist electric brake with shading coil A hoist brake unit having a shading coil mechanically locked into the core of the brake unit's electromagnet. The mechanical lock is achieved by passing the coil through a cavity in the core having intervening core material between the cavity and an exter... | 03/27/1979 |
| 4048458 | Induction heating core structure and method of heating An induction heating coil and core structure which provides two distinct magnetic circuits, with the materials to be heated also forming a part of the circuits so that juxtaposed workpieces can be joined together with a layer of heat activatable adhesive ... | 09/13/1977 |
| 4020440 | Conversion and control of electrical energy by electromagnetic induction In this pioneering invention, electrical energy in alternating or direct current form at any selected power, voltage, current, or frequency, within wide limits, is converted and controlled to other forms of electrical energy at uniformly and continuously ... | 04/26/1977 |
| 4004251 | Inverter transformer A transformer designed to operate with a pair of power switching transistors in a d.c. to a.c. inverter is described. The transformer has an assembled core whose closed magnetic path is branched. A flux steering winding is used to ensure the prior saturat... | 01/18/1977 |
