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| Number | Title | Issue Date |
| 7439743 | Method and apparatus for rock sample analysis using magnetic susceptibility A method for determining one or more parameters of a rock sample, comprising the steps of measuring the magnetic susceptibility of the sample, and determining a value of the parameter using that measured susceptibility. For example, the measured susceptibility can b... | 10/21/2008 |
| 7405555 | Systems and methods for measuring local magnetic susceptibility including one or more balancing elements with a magnetic core and a coil A local magnetic susceptibility unit is adapted to measure the AC magnetic susceptibility of a surface region of a sample. The unit comprises a sensing element and one or more balancing elements arranged in a circuit. When a sample is placed proximate to the sensing... | 07/29/2008 |
| 7394246 | Superconductive quantum interference device (SQUID) system for measuring magnetic susceptibility of materials A superconductive quantum interference device (SQUID) system is provided for measuring the alternating current (AC) magnetic susceptibility of material at a single frequency or a mixing frequency from multiple frequencies, such as mf1+nf2, wher... | 07/01/2008 |
| 7363070 | Biomagnetic measurement apparatus Disclosed herein is a biomagnetic measurement apparatus capable of visualizing cardiac electrical current distributions with information on the cardiac morphology of a subject. A magnetic field component in the z direction, vertical to the chest surface of a subject... | 04/22/2008 |
| 7357196 | Method and system for predicting performance of a drilling system for a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specificat... | 04/15/2008 |
| 7261167 | Method and system for predicting performance of a drilling system for a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation is disclosed. The method generates a geology model of a given formation. The geology model includes a geology characteristic of the given ... | 08/28/2007 |
| 7205916 | Digital method and apparatus for resolving shaft position An apparatus and method for determining an angular position of a shaft are disclosed, which comprise resolving an excitation signal at an excitation frequency into at least two orthogonal signals, converting the orthogonal signals to a digital estimate, for each of ... | 04/17/2007 |
| 7166997 | Complex transverse AC magneto-optic susceptometer for determination of volume and anisotropy field distribution in recording media A method and apparatus for determining volume and anisotropy field distribution of thin film granular material includes the use of a magneto-optic probe, a lock-in amplifier, and a computer. The magneto-optic probe utilizes the Kerr effect in order to determine the ... | 01/23/2007 |
| 7102346 | Measuring cell for determining characteristics of a paramagnetic gas based on gas flow sweeping past a test element A measuring cell for use in apparatus for the measurement of the magnetic characteristics of a gas comprises means (5) defining a chamber (3) in which a test element (11) is suspended such as to be able to rotate about an axis, and means de inle... | 09/05/2006 |
| 7094608 | Method for measuring lanthanide content dissolved in uranium oxide The present invention relates to a method for measuring the content of Lanthanides dissolved in uranium oxide, wherein the Lanthanides content in the nuclear fuel pellet is measured using the thermo gravimetric analysis which measures the weight variation caused by ... | 08/22/2006 |
| 7053610 | Squid detected NMR and MRI at ultralow fields Nuclear magnetic resonance (NMR) signals are detected in microtesla fields. Prepolarization in millitesla fields is followed by detection with an untuned dc superconducting quantum interference device (SQUID) magnetometer. Because the sensitivity of the SQUID is fre... | 05/30/2006 |
| 7047059 | Simplified water-bag technique for magnetic susceptibility measurements on the human body and other specimens A probe instrument using room-temperature sensor(s) that can measure variations in magnetic susceptibilities. The instrument has sufficient resolution to monitor paramagnetic materials in a human body, such as iron in a human liver, by noninvasively examining patien... | 05/16/2006 |
| 7040140 | Device for suspension of a sample body A device for suspension of a sample body which rotates in space about a rotation axis which is in a fixed position or is related to a fixed position, as a function of the intensity of a measurement effect. In order to ensure that a sample mass is mounted in the devi... | 05/09/2006 |
| 7032689 | Method and system for predicting performance of a drilling system of a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specificat... | 04/25/2006 |
| 7026811 | Methods and apparatus for eddy current inspection of metallic posts An apparatus for inspecting a metallic post contoured in a single dimension for defects. The apparatus has a clamp having at least one jaw with a surface conforming to the contour to the metallic post. The conforming jaw or jaws also have a plurality of eddy current... | 04/11/2006 |
| 6965792 | Susceptometers for foreign body detection Methods and apparatus for minimizing the effects of temperature drift in a magnetic susceptibility measurement instrument, such as an instrument used in pre-MRI screening for the presence of ferromagnetic foreign bodies. The magnetic field source and magnetic sensor... | 11/15/2005 |
| 6739179 | Device for measuring the oxygen concentration in gases A measuring device for determining the oxygen content in gases is described. The measuring device is disposed between two magnets that are positioned at a distance from one another. The measuring device is equipped with a sensor that is held rotatably within a frame... | 05/25/2004 |
| 6559635 | Method for nondestructively determining aged deterioration accompanying change in brittleness of ferromagnetic struction materials This invention is a method for nondestructively determining the deterioration of determining ferromagnetic materials by quantifying the change in brittleness with aging of the materials. This invention supposes acquirement of an embrittlement coefficient ... | 05/06/2003 |
| 6529008 | Electromagnetic induction coil sensor An electromagnetic induction coil includes a casing with high magnetic permeability with a magnet disposed within the casing. The magnet has a central hole. A core with high magnetic permeability is disposed within the central hole of the magnet. The core... | 03/04/2003 |
| 6477398 | Resonant magnetic susceptibility imaging (ReMSI) A three-dimensional magnetic susceptibility map of an object including a patient placed in a magnetic field is generated from a three-dimensional map of the resonant radio frequency (RF) magnetic flux external to the patient. The magnetic susceptibility o... | 11/05/2002 |
| 6263722 | Magnetomechanical gas analyzer, in particular paramagnetic oxygen analyzer A magnetomechanical gas analyzer such a paramagnetic oxygen analyzer which has a dumbbell which is rotatably suspended in the region of action of an inhomogeneous magnetic field and around which a gas to be measured flows. The dumbbell is connected, fixed... | 07/24/2001 |
| 6246227 | Sensor for measuring the magnetic characteristics of a gas A gas measurement cell has a measurement element suspended to oscillate about a suspension axis in a magnetic field. A coil which oscillates with the element may have electrical signals applied to it to initiate oscillation and also provides an output whe... | 06/12/2001 |
| 6208253 | Wireless monitoring of temperature Temperature sensing through observable, temperature-dependent effects on an interrogating magnetic field is facilitating by a sensing module having, first, a signal element that interacts with the interrogation field to produce a remotely readable magneti... | 03/27/2001 |
| 6037167 | Magnetic polynucleotide separation and analysis An apparatus for analyzing a sample of a mixture of compounds selected from the group consisting of polynucleotides, proteins and fragments thereof attached to magnetized moieties which generate a magnetic field contained on a substrate comprising: a) a s... | 03/14/2000 |
| 5936401 | Device and process for measuring electrical properties at a plurality of locations on thin film superconductors A device and process for determining the uniformity of a superconducting film's critical current density and transition temperature over a large area uses an array of ac coils placed in close proximity to a superconducting film. A variable ac current is p... | 08/10/1999 |
| 5914625 | Clock driver circuit and semiconductor integrated circuit device A clock driver circuit comprises a first and a second clock driver 15a and 15b. In each of these clock drivers, a plurality of main drivers 19(1) through 19(n) have their input nodes and output nodes connected respectively to a first and a second common l... | 06/22/1999 |
| 5523686 | Probes for scanning SQUID magnetometers Improved probes for miniaturized scanning magnetometers (scanning microscopes), particularly those utilizing superconducting quantum interference devices (SQUIDs), are provided by the invention. The improved probes can have sub-μm2 effective p... | 06/04/1996 |
| 5506500 | Magnetic property characterization system employing a single sensing coil arrangement to measure both AC susceptibility and DC magnetization A coil arrangement having a primary and two balanced secondaries is used to measure ac susceptibility and, using sample movement, also to perform absolute dc moment measurements. Since the same coil arrangement is used for both AC and DC measurements, the... | 04/09/1996 |
| 5491411 | Method and apparatus for imaging microscopic spatial variations in small currents and magnetic fields A magnetic flux microscope that measures the magnetic field about a sample surface. The apparatus uses a thin-film superconducting quantum interference device (SQUID) as the scanning device. Magnetic shielding is provided about the SQUID and is held stati... | 02/13/1996 |
| 5408178 | Apparatus and method for imaging the structure of diamagnetic and paramagnetic objects The surface or internal structure of diamagnetic and paramagnetic materials is imaged by measuring, preferably with a superconducting quantum interference device (SQUID) magnetometer, perturbations to an applied magnetic field resulting from variations in... | 04/18/1995 |
| 5311125 | Magnetic property characterization system employing a single sensing coil arrangement to measure AC susceptibility and DC moment of a sample A sensing coil arrangement including a pair of sensing coils connected in opposition is used to measure AC susceptibility and, using sample movement and a DC magnetization field source, also to sense signals for absolute DC moment measurements. Since the ... | 05/10/1994 |
| 5283524 | AC magnetic susceptometer with odd harmonic measurement for analyzing superconductive magnetic materials An improved AC susceptometer and methodology for its use which is particularly suitable for the characterization of the properties of superconducting materials. Added to the circuitry of a conventional AC susceptometer is frequency domain analytical equip... | 02/01/1994 |
| 5280240 | Methodology using odd harmonic components of an induced magnetic field for analyzing superconducting magnetic materials and their properties An improved AC susceptometer and methodology for its use which is particularly suitable for the characterization of the properties of superconducting materials. Added to the circuitry of a conventional AC susceptometer is frequency domain analytical equip... | 01/18/1994 |
| 5252920 | Magnetic characteristics measuring apparatus with a balancing mechanism A magnetic characteristics measuring apparatus attains high sensitivity measurement of magnetic characteristics of a specimen. A magnetic field is applied for a predetermined time to the specimen, which is suspended from a beam at one side of a balance, b... | 10/12/1993 |
| 5073858 | Magnetic susceptibility imaging (MSI) Magnetic Susceptibility Imaging (MSI) comprises a generator to magnetize the tissue to be imaged, such as a first Helmholtz coil, which produces a high-strength external magnetic field to which unpaired electrons of paramagnetic molecules of tissue, which... | 12/17/1991 |
| 5012674 | Method of exploration for hydrocarbons A method of exploring for hydrocarbons is disclosed wherein core is obtained over substantially the entire length of a well and substantially all lithologies represented within the core are analyzed at a core analysis facility located adjacent the well. A... | 05/07/1991 |
| 5004726 | Apparatus and methodology for the non-contact testing of materials for superconductivity by detecting odd harmonics above a threshold Apparatus and methodology for the rapid and inexpensive characterization of superconducting materials. The method and apparatus induces an alternating magnetic field in the sample to be tested. If the material is a superconductor odd harmonics are generat... | 04/02/1991 |
| 4969469 | Paramagnetic dynamo electromotive force detector and imaging system incorporating same An imaging system wherein the subject or patient to be examined is placed in a uniform constant magnetic field which is movable over the patient. A secondary magnetic field is generated by paramagnetic substances within the subject when located within the... | 11/13/1990 |
| 4861990 | Tunneling susceptometry Methods and apparatus for determining susceptibility of a material to a field, such as magnetic susceptibility, provide an elastic support for a sample of that material, and an electric tunneling current through a gap between an electrode and that elastic... | 08/29/1989 |
| 4854163 | Beltless core conveyor system for wellsite analysis A core trough is driven by drive means along a path adjacent analysis means for preliminary analysis of sectioned core taken during stratigraphic exploration.... | 08/08/1989 |
