Assignee
HITACHI GLOBAL STORAGE TECH
NL·2,235 granted patents·140 pending applications·26,432 citations·filing 1997–2010
Top patents by PatentIndex Score
2,375 records- 0199US7488609B1Method for forming an MgO barrier layer in a tunneling magnetoresistive (TMR) deviceHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Feb 10, 2009·108 cites·16 claims
- 0299US7463502B2Ultra low-cost solid-state memoryHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Dec 9, 2008·203 cites·25 claims
- 0398US7791839B2Thermally-assisted perpendicular magnetic recording system with write pole surrounding an optical channel and having recessed pole tipHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Sep 7, 2010·71 cites·29 claims
- 0498US7532433B2Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using itHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted May 12, 2009·51 cites·14 claims
- 0598US7502189B2Apparatus, signal-processing circuit and device for magnetic recording systemHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Mar 10, 2009·156 cites·44 claims
- 0698US7372674B2Magnetic tunnel transistor with high magnetocurrent and stronger pinningHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted May 13, 2008·61 cites·29 claims
- 0798US7002775B2Head for perpendicular magnetic recording with a shield structure connected to the return pole pieceHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Feb 21, 2006·132 cites·16 claims
- 0897US7839605B2Electrical signal-processing device integrating a flux sensor with a flux generator in a magnetic circuitHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Nov 23, 2010·44 cites·43 claims
- 0997US7791844B2Magnetoresistive sensor having a magnetically stable free layer with a positive magnetostrictionHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Sep 7, 2010·49 cites·18 claims
- 1097US7713762B2Testing the quality of lift-off processes in wafer fabricationHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted May 11, 2010·107 cites·20 claims
- 1197US7697242B2Method for providing a self-pinned differential GMR sensor having a bias structure comprising layers of ferromagnetic and non-magnetic material selected to provide a net-zero magnetic momentHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Apr 13, 2010·37 cites·5 claims
- 1297US7694105B2Data storage systems that implement sector setsHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Apr 6, 2010·38 cites·20 claims
- 1397US7675703B2Magnetic recording disk drive with patterned media and system for clocking write dataHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Mar 9, 2010·40 cites·15 claims
- 1497US7649712B2Self aligned wrap around shield for perpendicular magnetic recordingHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Jan 19, 2010·65 cites·23 claims
- 1597US7522392B2Magnetoresistive sensor based on spin accumulation effect with terminal connection at back end of sensorHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Apr 21, 2009·46 cites·12 claims
- 1697US7486460B2Disk drive with enhanced storage capacity increase ratioHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Feb 3, 2009·66 cites·16 claims
- 1797US7450333B2Electrostatic fly-height controlHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Nov 11, 2008·54 cites·18 claims
- 1897US7440221B2Calibration of reader/writer offset in hard disk drive using shingled recordingHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 21, 2008·39 cites·13 claims
- 1997US7408731B2Track allocation method of disk driveHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Aug 5, 2008·47 cites·8 claims
- 2097US7295401B2Laminated side shield for perpendicular write head for improved performanceHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Nov 13, 2007·76 cites·59 claims
- 2197US7190543B2Method and apparatus for optimizing flying height control using heated slidersHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Mar 13, 2007·37 cites·21 claims
- 2297US7130159B2Magnetic disk apparatusHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Oct 31, 2006·67 cites·19 claims
- 2397US7120988B2Method for forming a write head having air bearing surface (ABS)HITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Oct 17, 2006·81 cites·31 claims
- 2497US7035049B2Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk deviceHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Apr 25, 2006·64 cites·11 claims
- 2597US7009812B2Magnetic transducer for perpendicular magnetic recording with single pole write head with trailing shieldHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Mar 7, 2006·110 cites·21 claims
- 2697US7008550B2Method for forming a read transducer by ion milling and chemical mechanical polishing to eliminate nonuniformity near the MR sensorHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Mar 7, 2006·94 cites·31 claims
- 2797US6967810B2System and method for writing HDD depending on direction of head skewHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Nov 22, 2005·89 cites·19 claims
- 2897US6947235B2Patterned multilevel perpendicular magnetic recording mediaHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Sep 20, 2005·87 cites·36 claims
- 2997US6881497B2‘Thermal spring’ magnetic recording media for writing using magnetic and thermal gradientsHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Apr 19, 2005·65 cites·12 claims
- 3097US6754017B2Patterned media magnetic recording disk drive with timing of write pulses by sensing the patterned mediaHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Jun 22, 2004·94 cites·16 claims
- 3197US6674590B2System and method for estimating a frequency of slider airbearing resonanceHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Jan 6, 2004·63 cites·41 claims
- 3296US7835111B2Magnetic write head with upper return pole optimization for reduced trailing shield protrusionHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Nov 16, 2010·49 cites·20 claims
- 3396US7751156B2Dual-layer free layer in a tunneling magnetoresistance (TMR) elementHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jul 6, 2010·33 cites·19 claims
- 3496US7729088B2Magnetic disk apparatus with heating device and magnetic head slider used thereforHITACHI GLOBAL STORAGE TECH·Filed 2009·Granted Jun 1, 2010·24 cites·5 claims
- 3596US7724470B2Thermally assisted recording of magnetic media using an optical resonant cavity and nano-pin power delivery deviceHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted May 25, 2010·24 cites·31 claims
- 3696US7715147B2Magnetic write head having a shield that extends below the leading edge of the write poleHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted May 11, 2010·32 cites·13 claims
- 3796US7693593B2Production planning method and production planning systemHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Apr 6, 2010·277 cites·12 claims
- 3896US7652856B2Current perpendicular to plane (CPP) magnetoresistive sensor having strong pinning and small gap thicknessHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Jan 26, 2010·26 cites·20 claims
- 3996US7649677B2Multi-ridged subwavelength aperture for optical transmission and thermally assisted magnetic recordingHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jan 19, 2010·29 cites·36 claims
- 4096US7643234B2Servo patterns for self-assembled island arraysHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Jan 5, 2010·28 cites·8 claims
- 4196US7606007B2Shield stabilization for magnetoresistive sensorsHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 20, 2009·39 cites·20 claims
- 4296US7580230B2Magnetoresistive sensor having shape enhanced pinning, a flux guide structure and damage free virtual edgesHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Aug 25, 2009·25 cites·5 claims
- 4396US7570455B2Data storage device and magnetic disk drive in hermetically sealed conditionHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Aug 4, 2009·65 cites·18 claims
- 4496US7558019B2Perpendicular magnetic recording write head with flux-conductor contacting write poleHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jul 7, 2009·32 cites·17 claims
- 4596US7522391B2Current perpendicular to plane magnetoresistive sensor having a shape enhanced pinned layer and an in stack bias structureHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Apr 21, 2009·32 cites·21 claims
- 4696US7508619B2Magnetic head and magnetic disc driveHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Mar 24, 2009·40 cites·12 claims
- 4796US7502193B2Positioning of a magnetic head in a magnetic data recording device using a multiple sensor arrayHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Mar 10, 2009·26 cites·32 claims
- 4896US7492540B2Apparatus system and method for variable data density patterned mediaHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Feb 17, 2009·25 cites·19 claims
- 4996US7477481B2Bilayer trailing shield gap for perpendicular headHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Jan 13, 2009·31 cites·20 claims
- 5096US7443625B2Magnetic disk driveHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 28, 2008·29 cites·10 claims
Showing the top 50 of 2,375 patent records by PatentIndex Score.
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