Patents by Inventor David Hu
David Hu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8525509Abstract: An electronic component tester characterizes electronic components such as magnetic head/media components measure performance parameters such as signal-to-noise ratio and overwrite evaluation. The electronic component tester has a tester process controller and a spectrum analyzer. The tester process controller generates calibration and control signals for the electronic component tester. The spectrum analyzer is in communication with electronic components such as magnetic head or media components to receive a response characterization signal resulting from a stimulus signal applied to the electronic components. The spectrum analyzer then determines a frequency spectrum of the response characterization signal. The spectrum analyzer is also in communication with the tester process controller for transferring the frequency spectrum to the tester process controller.Type: GrantFiled: December 4, 2007Date of Patent: September 3, 2013Assignee: Headway Technologies, Inc.Inventors: Lou Shrinkle, Peter Crill, Matthew Yee, David Hu
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Patent number: 8358481Abstract: The preferred embodiments of the present invention are devices and processes for producing high resolution lithography or pattern formation on the nanometer scale, using a voltage-biased probe that is slider-mounted along with, or separate from but linked to, a magnetic read head within a HDD mechanism. The probe is guided and positioned over a target layer by the motion of the read head which is, itself, guided by signals from servo tracks on a magnetic layer that activate an electromechanical servomechanism within the HDD. An electric field produced by the probe is capable of modifying the surface of the target layer over which the probe flies either directly, or by current induced or thermally induced effects. Targets such as amorphous or crystalline silicon can be hydrogen passivated and the electric field will produce oxidized or anodized lines with nanometer resolution.Type: GrantFiled: April 2, 2008Date of Patent: January 22, 2013Assignee: Headway Technologies, Inc.Inventors: Yuchen Zhou, Erhard Schreck, David Hu
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Publication number: 20120245730Abstract: A novel specimen dispensing device for skin care and skin treatment is disclosed. Methods to utilize the embedded memory and electrical interface of the device to produce customizable skin care products and give better skin treatment results are presented. The invention has applicability to other health care and personal care needs.Type: ApplicationFiled: June 9, 2012Publication date: September 27, 2012Inventors: Yuchen Zhou, Hieu Tieu, Chao Uei Wahng, David Hu
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Patent number: 8107200Abstract: A slider mounted CPP GMR or TMR read head sensor is protected from electrostatic discharge (ESD) damage and from noise and cross-talk from an adjacent write head by means of a balanced resistive/capacitative shunt. The shunt includes highly resistive interconnections between upper and lower shields of the read head and a grounded slider substrate and a low resistance interconnection between the lower pole piece of the write head and the substrate. The capacitances between the pole piece and the upper shield, the upper shield and the lower shield and the lower shield and the substrate are made equal by either forming the shields and pole piece with equal surface areas and separating them with dielectrics of equal thicknesses, or by keeping the ratio of area to insulator thicknesses equal.Type: GrantFiled: June 19, 2008Date of Patent: January 31, 2012Assignees: Headway Technologies, Inc., SAE Magnetics (HK) Ltd.Inventors: Eric Cheuk Wing Leung, Anthony Wai Yuen Lai, Pak Kin Wong, David Hu, Moris Dovek, Rod Lee
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Publication number: 20110320046Abstract: The resonance frequency of a forced torsionally oscillating mirror MEMS device can be controlled in the presence of perturbations by means of a closed loop feedback device and method of using it. The method is implemented through a simple algorithm, implemented in either software or hardware, that maintains the condition of resonance, or another selected frequency, by recursively determining that the center of the driving voltage pulse is positioned at a point on the measured positional waveform of the oscillating system.Type: ApplicationFiled: June 29, 2010Publication date: December 29, 2011Inventors: David Drouin, David Hu, Sung Chung
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Patent number: 8070003Abstract: Formation of an “organically”-shaped feature on an otherwise abstract-shaped package. In particular, an organic or human anatomical feature is provided on an otherwise inanimate shape. More particularly, a package, such as a bottle, having a non-representational form (in other words, a package not shaped to resemble any particular form existing in nature) is provided with a feature specifically designed to resemble a form in nature or “organic” form. In an exemplary embodiment, the form in nature (or “organic” feature) is a “baby fat crease.” In particular, a crease is provided on the package to mimic the look of a baby fat crease. The geometry of the crease as well as the geometry of the package are optimized to achieve the desired organic look or effect.Type: GrantFiled: August 10, 2009Date of Patent: December 6, 2011Assignee: Johnson & Johnson Consumer Companies, Inc.Inventors: B. Todd True, David Hu
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Patent number: 8030937Abstract: Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image.Type: GrantFiled: December 11, 2006Date of Patent: October 4, 2011Assignee: Halliburton Energy Services, Inc.Inventors: Guoyu (David) Hu, Michael S. Bittar, William J. Schaecher
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Publication number: 20100321820Abstract: The preferred embodiments of the present invention are devices and processes for producing high resolution lithography or pattern formation on the nanometer scale, using a voltage-biased probe that is slider-mounted along with, or separate from but linked to, a magnetic read head within a HDD mechanism. The probe is guided and positioned over a target layer by the motion of the read head which is, itself, guided by signals from servo tracks on a magnetic layer that activate an electromechanical servomechanism within the HDD. An electric field produced by the probe is capable of modifying the surface of the target layer over which the probe flies either directly, or by current induced or thermally induced effects. Targets such as amorphous or crystalline silicon can be hydrogen passivated and the electric field will produce oxidized or anodized lines with nanometer resolution.Type: ApplicationFiled: April 2, 2008Publication date: December 23, 2010Inventors: Yuchen Zhou, Erhard Schreck, David Hu
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Publication number: 20100270258Abstract: Formation of an “organically”-shaped feature on an otherwise abstract-shaped package. In particular, an organic or human anatomical feature is provided on an otherwise inanimate shape. More particularly, a package, such as a bottle, having a non-representational form (in other words, a package not shaped to resemble any particular form existing in nature) is provided with a feature specifically designed to resemble a form in nature or “organic” form. In an exemplary embodiment, the form in nature (or “organic” feature) is a “baby fat crease.” In particular, a crease is provided on the package to mimic the look of a baby fat crease. The geometry of the crease as well as the geometry of the package are optimized to achieve the desired organic look or effect.Type: ApplicationFiled: August 10, 2009Publication date: October 28, 2010Inventors: B. Todd True, David Hu
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Patent number: 7746078Abstract: Calculating resistivity of an earth formation. At least some of the illustrative embodiments are systems including: a first current source current return (CSCR) pair, said first CSCR pair comprises a first current source and a first current return, the first current return receives current from the first current source; a second CSCR pair, the second CSCR pair disposed along a longitudinal axis of said apparatus from the first CSCR pair, the second CSCR pair comprises a second current source and a second current return, and the second current return receives current from the second current source; and a monitor electrode disposed between the first CSCR pair and the second CSCR pair, a distance between the first current source and the monitor electrode is substantially equal to the distance between the second current source and the monitor electrode, and the monitor electrode monitors a first voltage and a second voltage.Type: GrantFiled: August 29, 2008Date of Patent: June 29, 2010Assignee: Halliburton Energy Services, Inc.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Patent number: 7672073Abstract: A method for operating a head testing apparatus or, more generally, a host hard disk drive using a mounted hard disk that has had its servo track information pre-written in an external servo-writing apparatus rather than in the head testing or host apparatus itself. The method eliminates repeatable errors and repeatable runout by effectively replacing the pre-written servo tracks, which are eccentric, with new track profiles that are tracked like circular tracks. The problem of repeatable errors is caused by repeatable runout superimposed upon written-in position errors when a disk written in one machine is transferred to another. This problem is eliminated by forming IRON (Iterative Repeatable Runout Nulling) profile tracks from the initially pre-written servo tracks, where the IRON profile tracks are effectively tracked as concentric circular tracks and generate no PES.Type: GrantFiled: February 14, 2008Date of Patent: March 2, 2010Assignee: Headway Technologies, Inc.Inventors: Lou Shrinkle, Peter Crill, Matthew Yee, David Hu
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Patent number: 7580218Abstract: A method for operating a head testing apparatus (spin stand) using a mounted hard disk that has had its servo track information pre-written in an external servo-writing apparatus rather than in the testing apparatus itself. This insures more accurate servo-track writing and renders the testing operation more efficient. The problem of repeatable runout (RRO) associated with the transfer of a disk written in one machine to another is eliminated by forming a corrected position error signal (PES) by subtracting the average offset of one or more servo sector locations previously calculated using limited bandwidth operation of the servomechanism, from the position error signal generated during full bandwidth servo operation of the apparatus.Type: GrantFiled: September 1, 2005Date of Patent: August 25, 2009Assignee: Headway Technologies, Inc.Inventors: Lou Shrinkle, David Hu, Peter Crill, Matthew Yee
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Publication number: 20090207516Abstract: A method for operating a head testing apparatus or, more generally, a host hard disk drive using a mounted hard disk that has had its servo track information pre-written in an external servo-writing apparatus rather than in the head testing or host apparatus itself. The method eliminates repeatable errors and repeatable runout by effectively replacing the pre-written servo tracks, which are eccentric, with new track profiles that are tracked like circular tracks. The problem of repeatable errors is caused by repeatable runout superimposed upon written-in position errors when a disk written in one machine is transferred to another. This problem is eliminated by forming IRON (Iterative Repeatable Runout Nulling) profile tracks from the initially pre-written servo tracks, where the IRON profile tracks are effectively tracked as concentric circular tracks and generate no PES.Type: ApplicationFiled: February 14, 2008Publication date: August 20, 2009Inventors: Lou Shrinkle, Peter Crill, Matthew Yee, David Hu
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Publication number: 20090140732Abstract: An electronic component tester characterizes electronic components such as magnetic head/media components measure performance parameters such as signal-to-noise ratio and overwrite evaluation. The electronic component tester has a tester process controller and a spectrum analyzer. The tester process controller generates calibration and control signals for the electronic component tester. The spectrum analyzer is in communication with electronic components such as magnetic head or media components to receive a response characterization signal resulting from a stimulus signal applied to the electronic components. The spectrum analyzer then determines a frequency spectrum of the response characterization signal. The spectrum analyzer is also in communication with the tester process controller for transferring the frequency spectrum to the tester process controller.Type: ApplicationFiled: December 4, 2007Publication date: June 4, 2009Inventors: Lou Shrinkle, Peter Crill, Matthew Yee, David Hu
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Publication number: 20080315884Abstract: A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source-a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source-current return pair. Where more than one current source-current return pair is included, the tool is capable of multiple depths of investigation into surrounding formation. This data can be used as a gauge to establish the reliability of the data and to determine the resistance of the invaded zone around the borehole, as well as standoff distance of the tool from the borehole wall.Type: ApplicationFiled: August 29, 2008Publication date: December 25, 2008Applicant: HALLIBURTON ENERGY SERVICES, INC.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Publication number: 20080259506Abstract: A slider mounted CPP GMR or TMR read head sensor is protected from electrostatic discharge (ESD) damage and from noise and cross-talk from an adjacent write head by means of a balanced resistive/capacitative shunt. The shunt includes highly resistive interconnections between upper and lower shields of the read head and a grounded slider substrate and a low resistance interconnection between the lower pole piece of the write head and the substrate. The capacitances between the pole piece and the upper shield, the upper shield and the lower shield and the lower shield and the substrate are made equal by either forming the shields and pole piece with equal surface areas and separating them with dielectrics of equal thicknesses, or by keeping the ratio of area to insulator thicknesses equal.Type: ApplicationFiled: June 19, 2008Publication date: October 23, 2008Inventors: Eric Cheuk Wing Leung, Anthony Wai Yuen Lai, Pak Kin Wong, David Hu, Moris Dovek, Rod Lee
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Publication number: 20080252296Abstract: Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image.Type: ApplicationFiled: December 11, 2006Publication date: October 16, 2008Applicant: Halliburton Energy Services, Inc.Inventors: Guoyu (David) Hu, Michael S. Bittar, William J. Schaecher
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Patent number: 7427863Abstract: Method and system for calculating resistivity of an earth formation. At least some of the illustrative embodiments are methods comprising transmitting a current from a first current source, receiving at least part of the current at a first current return, said first current disposed remotely from the first current source, and measuring a first voltage at a monitor electrode, said monitor electrode disposed more remotely from below the first current source than said first current return.Type: GrantFiled: July 13, 2006Date of Patent: September 23, 2008Assignee: Halliburton Energy Services, Inc.Inventors: Michael S. Bittar, Guoyu (David) Hu, James Buchanan
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Patent number: D645752Type: GrantFiled: April 27, 2009Date of Patent: September 27, 2011Assignee: J&J Consumer Companies, Inc.Inventors: B. Todd True, David Hu
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Patent number: D684063Type: GrantFiled: August 18, 2011Date of Patent: June 11, 2013Assignee: Johnson & Johnson Consumer Companies, Inc.Inventors: B. Todd True, David Hu