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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 |
| 8008810 | Phase-control switching apparatus and switching control method for phase-control switching apparatus A residual-magnetic-flux calculating unit includes a voltage-change-rate detecting unit that detects a transformer-voltage change rate from a phase voltage between a breaker and a transformer, a residual-magnetic-flux detecting unit that detects a residual magnetic ... | 08/30/2011 |
| 7330161 | Antenna, radio device, method of designing antenna, and method of measuring operating frequency of antenna An antenna comprises a first conductive layer, a second conductive layer and an LC resonance circuit. The first conductive layer has plural elements and is disposed adjacently to each other. The second conductive layer is disposed at a predetermined distance from th... | 02/12/2008 |
| 7256753 | Synthesis of metamaterial ferrites for RF applications using electromagnetic bandgap structures By configuring a high impedance frequency selective surface (HZ-FSS) structure for the appropriate values of surface impedance (surface resistance and surface reactance), a high frequency artificial ferrite metamaterial can be synthesized with almost any desired val... | 08/14/2007 |
| 7145518 | Multiple-frequency common antenna A multiple-frequency common antenna has a first substrate sheet and a second substrate sheet respectively structured by an HIP consisting of a metal plate, small metal plates disposed in two dimensions and linear metal bars connecting these elements. The antenna res... | 12/05/2006 |
| 7142822 | Package device for accommodating a radio frequency circuit A compact package whose inner walls can be located near a radio frequency circuit without changing the characteristics of the radio frequency circuit has a planar circuit on the bottom of the package, which is enclosed with metal walls. A high impedance plate is for... | 11/28/2006 |
| 7002518 | Low profile sector antenna configuration An impedance plane has an elongated strip ship. The impedance plane approximates a magnetic conductor within a particular frequency band. A sector antenna is coupled to one side of the impedance plane. The sector antenna has a planar form factor with dimensions cont... | 02/21/2006 |
| 6952190 | Low profile slot antenna using backside fed frequency selective surface A low profile, wide band gap antenna having a high impedance surface, the high impedance surface including a conductive plane and an array of conductive elements spaced from the conductive plane by a distance which is no greater than 10% of a wavelength of an operat... | 10/04/2005 |
| 6933895 | Narrow reactive edge treatments and method for fabrication An electromagnetic bandgap material is electrically attached to an edge, and enables high isolation between antennas due to the attenuation of surface waves. The disclosed embodiments further provide narrow reactive edge treatments in the form of artificial magnetic... | 08/23/2005 |
| 6497705 | Method and apparatus for creating a virtual electrode used for the ablation of tissue A method and apparatus for creating a virtual electrode to ablate bodily tissue. The surgical apparatus includes an inner tube and an outer tube. The inner tube defines a proximal portion and a distal portion. The distal portion forms an orifice for distr... | 12/24/2002 |
| 6262495 | Circuit and method for eliminating surface currents on metals A two dimensional periodic pattern of capacitive and inductive elements defined in the surface of a metal sheet are provided by a plurality of conductive patches each connected to a conductive back plane sheet between which an insulating dielectric is dis... | 07/17/2001 |
| 5986355 | Arrangement and method for reduction of magnetic fields and use thereof The present invention relates to an arrangement for reduction of magnetic alternating fields for example in a vehicle or similar which comprises at least one electrical system which comprises at least two elements of which at least one comprises one or mo... | 11/16/1999 |
| 5962978 | Apparatus for automatically degaussing a color picture tube in response to a power conservation mode An automatic degaussing circuit for a color picture tube (CPT) capable of automatically degaussing the CPT when a power conservation mode is released in a monitor having a power conservation function. The degaussing circuit includes a degaussing coil for ... | 10/05/1999 |
| 5953196 | Method and apparatus for an electromagnetic joystick lock with flux canceling driver circuit The locking force of an electromagnetic joystick lock with flux having a flux canceling driver circuit is controlled in order to maintain the control lever of a joystick in a desired position. In one embodiment, the locking force may be in either an activ... | 09/14/1999 |
| 5843567 | Electrical component containing magnetic particles There is disclosed an electrical component having an axial direction and two ends for making electrical contact with another component comprising a plurality of electrically conductive fibers in a matrix, the plurality of the fibers being oriented in the ... | 12/01/1998 |
| 5705861 | Magnetic field pulse generator A magnetic field pulse generators has an electrical coil and a magnetizable element being inductively coupled thereto, for together radiating a magnetic field into an external space. In order to switch off the magnetic field in the external space, the mag... | 01/06/1998 |
| 5557493 | Method of adjusting linearity A linear permanent magnet position sensor is produced by a novel permanent magnet demagnetization process. Demagnetization field strength is controlled to demagnetize a thinner portion of the permanent magnet less than, equally, or greater than a thicker ... | 09/17/1996 |
| 5198959 | Demagnetizing device for magnetic recording media The invention relates to a demagnetizing device for magnetic recording media, so-called pancakes, wound up in the form of a tape, which device consists of a cylindrical coil (1), the field distribution (3) of which extends essentially parallel to the wind... | 03/30/1993 |
| 5189590 | Closed-loop multi-sensor control system and method A closed-loop multi-sensor control system for controlling ship signatures positions away from local sensors used to direct local signatures controllers by controlling a field variable signature through local onboard sensors and active coil elements by de... | 02/23/1993 |
| 5089716 | Simplified driver for controlled flux ferrite phase shifter A monostable circuit with device-status feedback control to an external timing terminal is used to controllably change the magnetization state of a ferrite phase shifter core. A pair of such bistable circuits with suitable feedback controls permits a sing... | 02/18/1992 |
| 5085464 | Air bag firing circuit An air bag firing circuit comprises a firing path which includes redundant acceleration sensors, i.e., two sensors of like threshold connected in parallel. Each sensor comprises normally-open switch means operated by an inertial mass and shunted by a resi... | 02/04/1992 |
| 5016134 | Driver circuit for single coil magnetic latching relay A single coil magnetic latching relay drive circuit which utilizes AC power for energizing/deenergizing the relay. To energize the relay, a single full half cycle of the AC power at a first polarity is applied to the relay coil. To deenergize the relay, a... | 05/14/1991 |
| 4862014 | Method and apparatus for controlling the phase of signal driving a ferrimagnetic load A device-implemented method for driving a ferrimagnetic load (10), such as a phase shifter in an antenna array, which precisely meters the amount of magnetic flux imparted to the load (10) by sensing the voltage applied to a winding and integrating the se... | 08/29/1989 |
| 4595022 | Method for preventing remanence phenomena from interfering with magnetic field sensing systems and a device for implementation of the method In an exemplary embodiment, one or more flux pickups with ferromagnetic properties, preferably Hall generators provided with antennas, are provided for the detection of a field flux or of a change of field flux proceeding from a field generator. Magnetiza... | 06/17/1986 |
| 4445099 | Digital gyromagnetic phase shifter The phase shift resolution provided by an N element digital gyromagnetic phase shifter is increased and the number of obtainable phase states is increased by 2N -1 to 2N+1 -1 by modification of the control and driver circuitry to sel... | 04/24/1984 |
| 4426553 | Vehicle loudspeaker arrangement with magnetic-field-sensitive device A loudspeaker arrangement for a vehicle having a magnetic-field-sensitive device, includes a casing, and first and second loudspeakers disposed in the casing. First and second magnets are incorporated in the first and second loudspeakers respectively. The... | 01/17/1984 |
| 4383535 | Method for preventing remanence phenomena from interfering with magnetic field sensing systems and a device for implementation of the method In an exemplary embodiment, one or more flux pickups with ferromagnetic properties, preferably Hall generators provided with antennas, are provided for the detection of a field flux or of a change of field flux proceeding from a field generator. Magnetiza... | 05/17/1983 |
| 4382237 | Temperature compensation of a flux drive gyromagnetic system A flux drive gyromagnetic system such as a gyromagnetic waveguide phase shifter is temperature compensated by measuring the flux change in the gyromagnetic material during a reverse in saturation magnetization, comparing that change to the change under re... | 05/03/1983 |
| 4047046 | Circuit for setting magnetic remanence in a magnetizable core A circuit for selectively variably setting the magnetic remanence in a magnetizable core employs flux circuit feedback, including feedback initiating a self-blocking oscillator type of operation, to achieve designs of two or three (as the designer may des... | 09/06/1977 |
| 4039853 | Magnetizing device for permanent magnet motor for electric vehicle A magnetizing device for a permanent magnet motor used for driving an electric vehicle in which a magnetizing coil is wound around the permanent magnet of the permanent magnet motor, and means are provided for detecting a specific step such as manipulatio... | 08/02/1977 |
| 3988686 | Digitally controlled analog flux sensing ferrite phase shifter driver The present invention relates to a digitally controlled phase shift network for an analog flux-sensing ferrite phase shifter driver, as would be applied in controlling the phase of individual antenna elements in phased array radar systems. The phase shift... | 10/26/1976 |
