Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 8169213 | Magnetic field analysis method, magnetization analysis device, and recording medium with computer program It is possible to perform accurate magnetization analysis by considering the magnetic state of an incomplete magnetic region. A magnetization analysis device performs magnetization analysis by using a magnetizer parameter associated with a magnetizer and a magnet pa... | 05/01/2012 |
| 7441324 | Method for preventing magnetic damage to a GMR head during back-end processing A method is provided for preserving the transverse biasing of a GMR (or MR) read head during back-end processing. In a first preferred embodiment, the method comprises magnetizing the longitudinal biasing layers of the read head in a transverse direction, so that th... | 10/28/2008 |
| 7368906 | Tool for measuring magnetic properties at high temperatures The present invention relates to a measuring tool for measuring magnetic properties of a magnetic sample in a closed loop, comprising an electromagnet in a closed loop arrangement with two pole pieces connected to a yoke, said pole pieces forming a gap for the place... | 05/06/2008 |
| 7196894 | Method and a device for demagnetising objects The method according to the invention for demagnetization is effected in two separate steps. Firstly magnetically hard locations, such as weld seams, pressure locations etc., of an object to be demagnetized is pre-treated locally with high fields by way of choke coi... | 03/27/2007 |
| 7184116 | LCD having an alignment film comprising sintered carbon To provide a liquid crystal device using carbon films capable of aligning liquid crystal molecules simultaneously with deposition, a manufacturing apparatus of the liquid crystal device, a manufacturing method of the liquid crystal device and a forming method of an ... | 02/27/2007 |
| 7088096 | Combination hall effect position sensor and switch A combination Hall effect position sensor and switch for sensing the position of a moveable object. The sensor has a magnet that is attachable to the moveable object. The magnet has a pair of ends and a central portion. A linear magnetic flux sensor is positioned ab... | 08/08/2006 |
| 7071687 | Photomagnetic field sensor A photo magnetic field sensor includes a Faraday rotator made of a paramagnetic material, a polarizer, an analyzer, a light-irradiating element, and a light-sensing element. The Faraday rotator is made of a paramagnetic garnet single crystal including at least Tb an... | 07/04/2006 |
| 7030724 | Method and apparatus for coil-less magnetoelectric magnetic flux switching for permanent magnets Methods and apparatus that employ a coil-less magnetoelectric flux switch arrangement to repeatedly switch magnetic flux from at least one permanent magnet for the purposes of generating motive force and/or electrical energy. ... | 04/18/2006 |
| 7023201 | Magnetic position sensor apparatus and method A magnetic position sensor has a stator (16′, 36, 52) formed of magnetic material and a pair of magnets (14a, 14b; 34a, 34b; 54a, 54b; 64a, 64b) ... | 04/04/2006 |
| 6967478 | Pipe condition detecting apparatus The invention relates to apparatus and a method for detecting the condition of the material of a pipeline wall. The apparatus includes means for inducing and detecting magnetic flux at a location on the pipeline and, at said location, sensing means detect whether an... | 11/22/2005 |
| 6946938 | Method and apparatus for coil-less magnetoelectric magnetic flux switching for permanent magnets Methods and apparatus that employ a coil-less magnetoelectric flux switch arrangement to repeatedly switch magnetic flux from at least one permanent magnet for the purposes of generating motive force and/or electrical energy. ... | 09/20/2005 |
| 6937007 | Magnet field symmetry for hall sensor A method for balancing the flux density of a permanent magnet includes sensing flux density in a permanent magnet and if unbalanced relative to a physical center, adjusting the cross-sectional area and shape of the magnet by removing magnetic material from the magne... | 08/30/2005 |
| 6873151 | Sensor assembly for sensing angular position A sensor assembly for sensing angular position of an object is provided. The assembly may comprise at least one magneto-sensing magnet having a second axis of rotation. The assembly may further comprise a magnet having a second axis of rotation. At least one of the ... | 03/29/2005 |
| 6724184 | Device and method for determining a magnetic field as to its intensity and direction A device and a method for determining a magnetic field with respect to its intensity and direction at at least one detection location, and uses a first arrangement for superimposing an auxiliary magnetic field, known at least in intensity, on the magnetic field, and... | 04/20/2004 |
| 6611142 | Apparatus and method of measuring the multi-dimensional magnetic field distribution of a magnetic sample in real-time An apparatus for measuring the magnetic field distribution of a magnetic sample includes a magnetic field sensor arrangement having three, orthogonally-disposed, Hall sensors for sensing the magnetic field produced by a magnetic sample at a given location... | 08/26/2003 |
| 6591202 | Magnetic field measuring device An apparatus and method that tests an NMR system, including MRI scanners, by taking H-B measurements for the apparatus at any stage during the manufacture thereof, to thereby detect any defects of the NMR system at any point during the manufacture thereof... | 07/08/2003 |
| 6201386 | Method for demagnetizing and measuring remanence and coercivity characteristics of a magnetic sample A method and apparatus for determining remanence and coercivity of high strength rare earth magnets, without full determination of their hysteresis characteristics and subsequent computation, enables high speed, high throughput testing of such magnets in ... | 03/13/2001 |
| 5929630 | Magnetic flux sensor apparatus A flux sensitive device for creating electrical signals from magnetic flux produced by a magnetic piece has a first member defining a surface for sliding the magnetic piece. A conductive trace and a backiron are located proximate the first member such tha... | 07/27/1999 |
| 5155433 | Method and apparatus for testing bipolar magnets having a circular curvature A bipolar magnet as used in magnetic disk drives is characterized by measuring field strength of the magnet along a plurality of radii using a Hall effect sensor which is incrementally indexed across the magnet by a stepper motor. The gap field strength, ... | 10/13/1992 |
| 5126669 | Precision measurement of magnetic characteristics of an article with nullification of external magnetic fields Apparatus for characterizing the magnetic field of a device under test includes a device for nullifying the ambient magnetic field in a test environment area with a constant applied magnetic field, a device for rotating the device under test in the test e... | 06/30/1992 |
| 4806858 | Liquid crystal nondestructive inspection of magnetization and variations in magnetization of high energy magnets A method for coupling liquid crystals and a magnetic field to monitor changes in local magnetic properties (e.g., direction of magnetization) is provided. A magneto-optical sensor is used to detect and observe inhomogenieties, impurity phases, of a high e... | 02/21/1989 |
| 4804914 | Method for determining force characteristic of a device for magnetically holding workpieces A method for determining force characteristic of a device for magnetically holding workpieces placed on a top plate (3) of the device, wherein a workpiece (1) cooperating with a source of magnetic field of the device is connected to a force pick-up (2) an... | 02/14/1989 |
| 4782293 | Process for adjusting the magnetic field strength of permanent magnets A description is given of a pulse device for zeroing a permanent magnet to any desired operating point on its demagnetization curve, in which the strength of the demagnetizing pulse is automatically determined from the ratio between the operating point re... | 11/01/1988 |
| 4604573 | Drift resistant magnet strength signal evaluation circuit To test magnetic elements, by integrating output signals derived from a sensing coil to which the magnetic elements are exposed, by being passed therethrough, the output signals are additionally applied to a threshold switch, which activates the integrato... | 08/05/1986 |
| 4563236 | Method for making large area stable domains A method for producing a large area of single domain magnetic bistability is shown including the steps of selecting the properties of films of magnetic materials such that the saturation field (Hs) that is less than the value of the anisotropy ... | 01/07/1986 |
| 4465975 | Scanning apparatus and method for measuring a magnetic field produced by a sample There is disclosed a technique for measuring the magnetic field of a sample, such as sheet material having one or more magnetic poles, including effecting relative movement between a magnetically responsive transducer and the sample to scan the magnetic f... | 08/14/1984 |
| 4465974 | Apparatus for measuring magnetic field characteristics of magnetic materials Bodies of a ferrimagnetic material are disposed within small cavities provided in a magnetometer. The magnetometer is initially calibrated utilizing an electromagnet to produce an applied magnetic field of either known field strength, HDC, or k... | 08/14/1984 |
| 4340861 | Method of measuring magnetic field characteristics of magnetic materials Bodies of a ferrimagnetic material are disposed within small cavities provided in a magnetometer. The magnetometer is initially calibrated utilizing an electromagnet to produce an applied magnetic field of either known field strength, HDC, or k... | 07/20/1982 |
| 4311961 | Testing of enclosed electromagnetic relays An apparatus for testing enclosed electromagnetic relays includes a probe displaceable into the relay enclosure to engage the movable contact thereof. The probe is associated with a force transducer and a displacement transducer which provide inputs to a ... | 01/19/1982 |
| 4270087 | Apparatus for testing permanent magnets using electro-magnets and Hall sensors Apparatus for testing permanent magnets such as in a generator or alternator embodied in a fly wheel. The apparatus includes a testing head on which the fly wheel is placed for the purpose. The fly wheel has a circular series of permanent magnets, and the... | 05/26/1981 |
| 4186340 | Apparatus for measuring the magnetic strength of magnetic work pieces What is disclosed is an apparatus for measuring the relative magnetic field strength of magnetic workpieces such as miniature permanent magnet rotors which, for example, are included in miniature watch motors. The apparatus includes a nonmagnetic shaft me... | 01/29/1980 |
| 4156191 | Method and apparatus for adjusting the magnetic coupling between a Hall Effect switch and a permanent magnet A method and apparatus for setting the relative magnetic relationship between a Hall Effect switch with a given operating field strength and a permanent magnet to operate the switch and having a magnetic field with a field strength greater than the operat... | 05/22/1979 |
| 4104591 | Method of adjusting a permanent magnet by using a hypothetical demagnetization curve lower than the actual value An element together with a prospective shunt load is magnetized to become a permanent magnet whereafter the magnet is stepwise demagnetized, actually along the demagnetization curve but due to load along a load line passing through a point inside the dema... | 08/01/1978 |
| 4074197 | System for rotating small permanent magnets while adjusting and simultaneously sensing the magnetic moments thereof The present disclosure describes apparatus for the production of small permanent bar magnets accurately adjusted to a stable, predetermined value of magnetic moment. In accordance with the invention, the readout of the moment of the magnet under adjustmen... | 02/14/1978 |
| 4058763 | Apparatus for automatically magnetizing permanent magnet bodies, measuring their magnetic retentivity and sorting them An elongated generally U-shaped ferromagnetic yoke has a series of coils embedded in its leg portions at spaced positions along its length so that a magnet body can be moved along the length of the air gap of the yoke so that that it can be magnetized and... | 11/15/1977 |
| 4056770 | Dynamo electric machine permanent magnet flux test apparatus which simulates actual flux conditions of the motor To test the flux of circular segmental permanent magnets for assembly in permanent magnet dynamo electric machines, typically electric motors, a gauge is made of soft iron having an inner segmentally circular soft iron core, on it a layer of non-magnetic ... | 11/01/1977 |
