Famous Patents
The first commercial microwave oven was nearly 6 feet tall and weighed in at 750 pounds.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8004379 | High powered inductors using a magnetic bias A biased gap inductor includes a first ferromagnetic plate, a second ferromagnetic plate, a conductor sandwiched between the first ferromagnetic plate and the second ferromagnetic plate, and an adhesive between the first ferromagnetic plate and the second ferromagne... | 08/23/2011 |
| 7456716 | Electrical devices having adjustable electrical characteristics Electrical devices having tunable electrical characteristics are provided, such as variable resistors, capacitors and inductors. The tunable electrical characteristics are achieved by placing an appropriate material between substrate layers and by controllably apply... | 11/25/2008 |
| 7352269 | Method for making magnetic components with N-phase coupling, and related inductor structures Methods and structures for constructing a magnetic core of a coupled inductor. The method provides for constructing N-phase coupled inductors as both single and scalable magnetic structures, where N is an integer greater than 1. The method additionally describes how... | 04/01/2008 |
| 7271695 | Electromagnetic apparatus and method for making a multi-phase high frequency electromagnetic apparatus An electromagnetic apparatus includes: (a) A magnetic material arranged in a core structure establishing a first flux path set and a second flux path set; the first flux path set includes a first middle flux path oriented about a first axis and two first side flux p... | 09/18/2007 |
| 7085305 | Induction heating apparatus and methods of operation thereof Methods of operation of an induction melter include providing material within a cooled crucible proximate an inductor. A desired electromagnetic flux skin depth for heating the material within the crucible may be selected, and a frequency of an alternating current f... | 08/01/2006 |
| 6930578 | Field adjustable phase shifting transformer A field-adjustable phase shifting transformer apparatus for canceling harmonic currents in a three-phase alternating current (AC) power distribution system includes a primary having a plurality of sets of contact points for receiving power from a three-phase AC powe... | 08/16/2005 |
| 6879232 | Wide ratio autotransformer-type current ranging A transformer includes taps by which electrical contact can be made to winding sections of the transformer at locations along its length between its end terminals. A first switch permits contact to be made selectively to a selected one of the taps. An amplifier has ... | 04/12/2005 |
| 6646525 | Microelectro-mechanical system actuator device and reconfigurable circuits utilizing same A microelectro-mechanical device which includes a fixed electrode formed on a substrate, the fixed electrode including a transparent, high resistance layer, and a moveable electrode formed with an anisotropic stress in a predetermined direction and dispos... | 11/11/2003 |
| 6594309 | PWM power amplifier with digital input A digital input PWM power amplifier includes an oversampling and noise shaping circuit receiving pulse code modulated (PCM) digital input data organized in words of a first number of M bits at a bit rate, and outputting PCM digital data organized in words... | 07/15/2003 |
| 6169674 | Transformer, system and method to control harmonic distortion Harmonic distortion in a multiple phase power system is controlled by enabling different phase relationships to be set, and changed, in the field, between the devices being energized and the power source providing the energization. This has particular app... | 01/02/2001 |
| 6127908 | Microelectro-mechanical system actuator device and reconfigurable circuits utilizing same A microelectro-mechanical device which includes a fixed electrode formed on a substrate, the fixed electrode including a transparent, high resistance layer, and a moveable electrode formed with an anisotropic stress in a predetermined direction and dispos... | 10/03/2000 |
| 6087738 | Variable output three-phase transformer A three-phase transformer having a variable output utilizes an auxiliary winding to minimize the number of switches or taps required to provide a plurality of output voltages. At least two output windings or coils each have a plurality of taps correspondi... | 07/11/2000 |
| 5982262 | Phase shifting transformer with low zero phase sequence impedance A phase shifting transformer or autotransformer for a three phase power distribution network in which selected outputs have a low zero phase sequence impedance. At least one low zero phase sequence impedance output is fed by a plurality of windings distri... | 11/09/1999 |
| 5954985 | Matching apparatus for connecting high frequency solid state electrical power High frequency reactors for interconnecting a high frequency electrical power source and a load which reactors include a pair of plates having opposite surfaces with a length and width and a thickness between the surfaces which is small relative to the le... | 09/21/1999 |
| 5557249 | Load balancing transformer A three phase transformer having a pair of additional coupled windings on the secondary side of each phase, with these coupled windings properly connected in series to develop a voltage in phase with a particular secondary voltage but driven from alternat... | 09/17/1996 |
| 5543771 | Phase shifting transformer or autotransformer A phase shifting polygonal transformer or autotransformer for a three phase electrical distribution system is provided, in which the transformer output winding or autotransformer winding is composed solely of three main coils and three auxiliary coils, al... | 08/06/1996 |
| 5003277 | Phase-shifting transformer with a six-phase core A phase-shifting transformer including main and series transformer units comprises a six-phase core including six independent magnetic circuits, numbered first through sixth from right to left. The combined U-, V-, and W-phase windings of the main transfo... | 03/26/1991 |
| 4951024 | High efficiency saturating reactor for starting a three phase motor A three phase saturating reactor is constructed of thin E and I shaped laminations that are interleaved to minimize the effects of air gaps. The laminations include apertures that are in alignment and four identical frame members are secured thereto by me... | 08/21/1990 |
| 4694241 | Transformer tap changer One of a plurality of taps of at least one transformer is selected by choosing a predetermined plug to mate with a predetermined jack. The connection arrangement between each transformer and a corresponding jack is such that each pin of a respective jack ... | 09/15/1987 |
| 4639610 | Rotating flux transformer A rotating flux transformer having at least two magnetic cores, each in the form of a torus, with each magnetic core having poloidal and toroidal windings. The need for breaking the torus and bringing out leads from the poloidal winding is eliminated by p... | 01/27/1987 |
| 4638177 | Rotating flux transformer A rotating flux transformer which includes a magnetic core having poloidal primary and secondary windings and toroidal primary and secondary windings. Quadrature flux is produced in the magnetic core by connecting one end of the poloidal primary winding t... | 01/20/1987 |
| 4611190 | Apparatus for transforming multiphase power of different phase to phase line levels into multiphase power having a single phase to phase voltage level Three-phase power susceptible of having different line to line input voltages in the wye and delta configurations is converted into a three-phase wye output, each phase of which has the same line to line voltage for all of the predetermined input voltages... | 09/09/1986 |
| 4584550 | Contact piece for establishing delta circuits on three-legged transformers A connecting member for establishing delta circuits in a three-legged transformer includes a body formed from a mass of insulating material and having first, second and third pairs of opposing, radially extending connecting elements and electrically condu... | 04/22/1986 |
| 4568902 | Contact piece for air-cooled transformers having conductive lines A contact piece for providing conductive interconnection between the delta connection of the windings of a three-legged core transformer includes an insulative body having opposing vertical end surfaces in each of which a pair of end contacts is provided ... | 02/04/1986 |
| 4504811 | Cable operated tap changer for a three-phase transformer A three-phase transformer including tap changing apparatus for switching the turns ratio between the primary and secondary windings of a transformer. The tap changer comprises a cable operated mechanism for moving a movable contact carrier relative to thr... | 03/12/1985 |
| 4488136 | Combination transformer with common core portions A combination transformer with common yoke core characterized by the combination of a main transformer and series transformers, which transformers have separate and complete core and coil assemblies with a common core leg or yoke to reduce the core size, ... | 12/11/1984 |
| 4347489 | Variable three-phase inductor A three-phase variable inductor is disclosed in which a fixed frame is formed by a plurality of laminar plates, the plates being rotated with respect to each other about a common axis. Within the frame, a Y network is located, the Y network being so const... | 08/31/1982 |
