Patents Examined by Bot L. Ledynh
  • Patent number: 8274277
    Abstract: A high-resolution magnetic encoder system includes a magnetic resistive sensor, a fixed suspension, and a mechanism. The magnetic resistive sensor is mounted to the fixed suspension above a magnetic medium having at least one magnetic track. The fixed suspension is attached to the mechanism, such as a housing, a substrate, and/or an electronic board. The sensor is adapted to perform a relative movement with respect to and in close contact to the surface of the magnetic medium. The magnetic medium may be protected by an overcoat layer. The magnetic resistive sensor may be Giant Magnetic-Resistive (GMR) sensor and/or a Tunneling Magnetic-Resistive Sensor (TMR).
    Type: Grant
    Filed: August 29, 2009
    Date of Patent: September 25, 2012
    Assignee: International Business Machines Corporation
    Inventors: Andreas Dietzel, Marcus Breuer, Hubert Grimm, Karl-Heinz Lehnhert, Nikolaus Luckner, Rolf Schaefer, Guenther Michaelis
  • Patent number: 8207730
    Abstract: The present invention relates to methods for determining the existence and location of parasitic stress-inducing forces on a substantially cylindrical rod portion defined along a first axis and when this rod is made of a magnetostrictive material. The method according to the invention is essentially characterized in that it consists in magnetizing the wall of the rod portion in a pseudo-helix 10 centered on the first axis, in applying a forced stress between the two ends of the rod portion, in measuring, along the rod portion, the magnitude of the magnetic field created by the rod portion after it has been subjected to the forced stress, these measurements being taken in a direction substantially parallel to the first axis, and from these measurements, in deducing the existence and location of the parasitic stress-inducing forces on the rod portion. The invention also relates to a device for implementing this method.
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: June 26, 2012
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jean-Pierre Martin, Phillippe Broun, Jean-Paul Bongiraud, Vincent Bongiraud, legal representative, Jean-Louis Coulomb
  • Patent number: 8120355
    Abstract: A magnetic anomaly detector includes a magnetically active device which produces analog signals in response to magnetic fields. The analog signals are time quantized and then discrete-time differentiated. The differentiated signals are applied to a low-pass filter. The filtered signals are Fourier transformed into an amplitude-frequency spectrum. An error detector compares at least one reference amplitude-frequency spectrum with the reference spectrum to identify the presence or absence of a magnetic anomaly. The resulting error is displayed on a monitor or operates an alarm.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: February 21, 2012
    Assignee: Lockheed Martin Corporation
    Inventor: John B. Stetson
  • Patent number: 8102175
    Abstract: A magnetic field sensor device includes at least two magneto-resistive sensor elements and one switch which is connected to the at least two magneto-resistive sensor elements, and makes at least one magneto-resistive sensor element of the at least two magneto-resistive sensor elements electrically connectable into a magnetic field detection arrangement.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: January 24, 2012
    Assignee: Infineon Technologies AG
    Inventors: Werner Rössler, Wolfgang Granig, Dirk Hammerschmidt
  • Patent number: 8080993
    Abstract: A method of manufacturing a sensor module includes providing a substrate comprising a magnetically sensitive sensor element. The sensor element and the substrate are encapsulated with at least one mold material that is configured to apply a bias magnetic field to the sensor element.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: December 20, 2011
    Assignee: Infineon Technologies AG
    Inventors: Horst Theuss, Helmut Wietschorke
  • Patent number: 8018223
    Abstract: A magnetoresistive sensor system includes a plurality of chip carriers, such that each integrated circuit among the plurality of chip carriers is associated with a respective magnetoresistive sensing components. A plurality of magnetoresistive sensing components can be arranged in a rotary array, wherein each magnetoresistive component among the plurality of magnetoresistive components is associated with a respective integrated circuit among the plurality of chip carriers and wherein the plurality of magnetoresistive sensing components comprises sensing components that are spaced irregular from one another in order to optimize the performance of the rotary array and meet requirements of a particular magnetoresistive sensing application.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: September 13, 2011
    Assignee: Honeywell International Inc.
    Inventors: Michael J Latoria, Anthony M. Dmytriw, Lamar F. Ricks
  • Patent number: 8013610
    Abstract: A high-Q human-portable, battery-powered self-correcting tunable resonator in a transmitter apparatus for inducing alternating currents of high quality in buried conductors to facilitate their location. The transmitter apparatus employs an FET-driven capacitive tuning circuit and a coil design that achieves high precision, high-quality transmission signals, and which is equipped with a high-voltage booster for facilitating fault-localization applications.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: September 6, 2011
    Assignee: SeekTech, Inc.
    Inventors: Ray Merewether, Mark S. Olsson, Jeffrey A. Praha, Jan Soukup, David A. Cox, Mark F. Fleming, Lisa E. Latimer, Ryan B. Levin, Michael E. Turgeon, Stephen M. Bench, Edward N. Denaci
  • Patent number: 8008919
    Abstract: Transient measurements made at two spaced apart receivers responsive to separate activation of two transmitters symmetrically disposed about the two receivers. The transmitters and receivers are on an instrument having a conductive body induces currents in the earth formation. The effect of the conductive body is removed by using deconvolving the signal at one receiver using the measured signal at the other receiver. The symmetric transmitter configuration also enables compensation for receiver differences.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: August 30, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Tsili Wang, Roland E. Chemali
  • Patent number: 7990153
    Abstract: A method for making directional resistivity measurements includes sequentially transmitting first and second axial and transverse electromagnetic waves in a borehole and receiving substantially pure axial and transverse components of each of the transmitted waves. A composite ratio of the received components is computed and may be utilized as an indicator of various formation parameters. The invention advantageously provides for the acquisition of compensated directional resistivity measurements.
    Type: Grant
    Filed: May 11, 2009
    Date of Patent: August 2, 2011
    Assignee: Smith International, Inc.
    Inventors: Christopher C. Streinz, Tsili Wang
  • Patent number: 7982463
    Abstract: In one aspect an induction resistivity tool incorporated into a downhole tool string comprises an outer wall of a downhole component comprising an outer diameter and at least one induction transmitter assembly disposed along the outer diameter. The at least one transmitter assembly comprises at least one induction transmitter coil wound about at least one core. The at least one transmitter coil is adapted to project an induction signal outward from the outer wall when the at least one transmitter coil is carrying an electrical current. The transmitter assembly is adapted to create electromagnetic fields that originate the induction signal from outside the outer wall and substantially prevent the signal from entering the outer wall.
    Type: Grant
    Filed: March 4, 2008
    Date of Patent: July 19, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Harold L. Snyder, Jr., Paula Tumer
  • Patent number: 7982455
    Abstract: The object is to produce a magnetic encoder having a large outer diameter at a low cost, provide a sensor case which is compact in size and can be easily mounted and dismounted with a sensor element received therein, and to provide a double row rolling bearing with a preload application device and a rotational speed sensor which comprises a small number of parts and thus can be assembled easily. A magnetic member 12 of the magnetic encoder 11 is made of a magnetic material bound by rubber. The magnetic member 12 is bonded to an annular presser member 8, which also serves as a metal core, by an adhesive 13, thus eliminating the need for a mold and other facilities for vulcanization bonding. This makes it possible to manufacture a magnetic encoder 11 with a large outer diameter at a low cost.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: July 19, 2011
    Assignee: NTN Corporation
    Inventors: Hiroyoshi Ito, Seiichi Takada
  • Patent number: 7977938
    Abstract: A metal detector for detecting the presence of a ferrite object in the proximity of inductively coupled sensor having overlapping D shaped transmitter and receiver coils. The metal detector has a phase shift circuit to phase shifting a sensor output signal by a known amount and a switch operating in synchronization with an excitation signal of the sensor for sampling the amplitude of the phase shifted output signal.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: July 12, 2011
    Assignee: Solar Wide Industrial Ltd.
    Inventors: Hughes Sanoner, Desmond Wai Nang Tse, Lawrence Chi Hang Chan
  • Patent number: 7973532
    Abstract: A plurality of transmitters on a logging tool are activated simultaneously at substantially the same frequency. When the transmitter outputs are phase-modulated using a mutually orthogonal set of modulating functions, it is possible to recover, from the signal at each receiver, a response corresponding to each of the transmitters.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: July 5, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Stanislav W. Forgang, Roland E. Chemali
  • Patent number: 7969146
    Abstract: An displacement measurement device and associated method where displacement measurements of a movable member are obtained by an electromagnetic field sensor that need not move relative to the magnet or other electromagnetic field source. The electromagnetic field sensor senses disruptions in the electromagnetic field caused by movement of the movable member to provide an output indicative of the position of the actuator.
    Type: Grant
    Filed: May 14, 2007
    Date of Patent: June 28, 2011
    Assignee: Parker-Hannifin Corporation
    Inventors: Rollin C. Christianson, Clyde Bennett Stevens
  • Patent number: 7969151
    Abstract: A pre-amplifier circuit for connection to an antenna of a human-portable locator includes a differential amplifier/mixer pair and means for allowing a common-mode “phantom” signal to modulate a transfer function of the differential amplifier/mixer pair. The common-mode phantom signal modulates the transfer function of the differential pre-amplifier “onboard” the antenna without the usual requirement for onboard power supply and signal oscillator. This technique uses the same electronic components to provide both pre-amplification and mixing functions, thereby improving circuit performance-to-cost ratio, reducing mixer power consumption, situating the necessary signal oscillator remotely from the mixer, and greatly improving the available system bandwidth by limiting spectral transmission demands to the mixed signal bandwidth alone.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: June 28, 2011
    Assignee: SeekTech, Inc.
    Inventor: Stephen M. Bench
  • Patent number: 7965075
    Abstract: Disclosed is a base module for a motion sensor, particularly a tacho generator, phase transducer, or transmission sensor for a motor vehicle. Said base module (22) comprises at least one busbar (11) for contacting an integrated circuit (36) used for sensing a motion. The base module (22) further comprises at least one wiring means (12, 14) which is arranged on the busbar (11). The busbar (11) and the wiring means (12) are surrounded at least in part by a sheath (26).
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: June 21, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang-Michael Mueller, Jochen Groeger, Joerg Siedentopf
  • Patent number: 7960973
    Abstract: A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the field. A positional relationship between the receiver and the device is monitored using the output. In one aspect, changing the positional relationship, by moving the device nearer to a boring tool which supports the receiver, causes an increase in accuracy of depth determination. In another aspect, determination of an actual overhead position of the boring tool, and its application, are described. Use of a plurality of measurements over at least one-half revolution of each magnet is disclosed. Establishing a surface radial direction toward a boring tool and resolution of multi-valued parameters is described. Calibration techniques, as well as a three transmitter configuration are also described.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: June 14, 2011
    Assignee: Merlin Technology, Inc.
    Inventors: Rudolf Zeller, Guenter W. Brune, Albert W. Chau, John E. Mercer
  • Patent number: 7960968
    Abstract: It is an object of the present invention to provide a method for investigating magnetic domains, the method capable of easily grasping behavior of the magnetic domains in a head manufacturing process, and further to provide a testing method of a magnetic head capable of evaluating whether the writing performance of the magnetic head is good or not. The method for investigating magnetic domains comprises supplying direct current (DC) to a coil of an electromagnetic transducer provided in a magnetic head for writing data onto a magnetic recording medium; measuring an inductance of the electromagnetic transducer at each current value while varying the current value of the direct current; and investigating behavior of magnetic domains in a magnetic core of the electromagnetic transducer based on a relationship between the current values and the inductances.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: June 14, 2011
    Assignee: TDK Corporation
    Inventors: Hiroshi Kiyono, Takahiro Mori
  • Patent number: 7956607
    Abstract: Digital ferromagnetic part inspection system and method use a magnetizer for magnetizing a ferromagnetic part to be inspected, wherein a defect in or near a surface of the ferromagnetic part causes an external magnetic field. A magnetic field sensing element is positioned near the ferromagnetic part for sensing the external magnetic field. An inspection module identifies the defect in or near the surface of the ferromagnetic part by interpreting data collected by the magnetic field sensing element in response to the magnetic field sensing element being placed near the ferromagnetic part.
    Type: Grant
    Filed: September 9, 2008
    Date of Patent: June 7, 2011
    Assignee: General Electric Company
    Inventor: Robert William Bergman
  • Patent number: RE42493
    Abstract: A resistivity device for downhole use with a nonconducting mud injects a current at a frequency sufficiently high to pass capacitively through the mud and a mud cake into the formation. The frequency is further selected so that the impedance due to the dielectric constant of the formation is small compared to the formation resistivity. Dual frequency measurements may be used to further minimize the effects of the mud and mud cake resistivity. When multiple frequency measurements are used, frequency focusing may be used to get an estimate of formation resistivity that is independent of near borehole effects.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: June 28, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Leonty Abraham Tabarovsky, Albert Alexy