Assignee
HITACHI GLOBAL STORAGE TECH NL
NL·331 granted patents·7 pending applications·2,772 citations·filing 2001–2011
Top patents by PatentIndex Score
338 records- 0198US8351151B2Thermally assisted magnetic write head employing a near field transducer (NFT) having a diffusion barrier layer between the near field transducer and a magnetic lipHITACHI GLOBAL STORAGE TECH NL·Filed 2010·Granted Jan 8, 2013·99 cites·24 claims
- 0298US7965465B2Techniques for storing shingle blocks in a cache memory using a data storage deviceHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Jun 21, 2011·75 cites·16 claims
- 0397US8049984B2Integrated slider bias controlHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Nov 1, 2011·38 cites·15 claims
- 0497US8031561B2Joint design of thermally-assisted magnetic recording head and patterned media for high optical efficiencyHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Oct 4, 2011·53 cites·20 claims
- 0597US7982996B2Perpendicular magnetic recording write head and system with improved spin torque oscillator for microwave-assisted magnetic recordingHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Jul 19, 2011·116 cites·27 claims
- 0697US7894159B2Perpendicular write head with independent trailing shield designsHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Feb 22, 2011·44 cites·6 claims
- 0796US7990647B2Thermally assisted recording head control means for protrusion managementHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Aug 2, 2011·27 cites·9 claims
- 0896US7986592B2Components and assembly procedure for thermal assisted recordingHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Jul 26, 2011·28 cites·14 claims
- 0996US7986491B2Hard disk drive with disk separator for creating axial gaps between disks for access by read/write headsHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Jul 26, 2011·27 cites·20 claims
- 1096US7957092B2Magnetic disk drive and method for production thereofHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Jun 7, 2011·29 cites·12 claims
- 1196US7880996B2Ridge wave-guide for thermal assisted magnetic recordingHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Feb 1, 2011·27 cites·23 claims
- 1296US7861400B2Fabricating a write head with multiple electronic lapping guidesHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Jan 4, 2011·26 cites·10 claims
- 1396US7855489B2Microactuator substrateHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Dec 21, 2010·33 cites·9 claims
- 1495US8351155B2Perpendicular magnetic recording system with spin torque oscillator and control circuitry for fast switching of write pole magnetizationHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Jan 8, 2013·25 cites·9 claims
- 1595US8014097B1Disk drive with adaptive counting of writes to the data tracks for minimizing the effect of adjacent track encroachmentHITACHI GLOBAL STORAGE TECH NL·Filed 2010·Granted Sep 6, 2011·33 cites·13 claims
- 1695US7995307B2Perpendicular magnetic recording write head with trailing shield having throat height defined by electroplated nonmagnetic pad layer and method for making the headHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Aug 9, 2011·26 cites·7 claims
- 1795US7986490B2Reduce leakage of low-density gas during low-density gas injection into a disk driveHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Jul 26, 2011·21 cites·11 claims
- 1895US7976715B2Method using block copolymers for making a master mold with high bit-aspect-ratio for nanoimprinting patterned magnetic recording disksHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Jul 12, 2011·34 cites·25 claims
- 1995US7920358B2Perpendicular magnetic recording write head with magnetic shields separated by nonmagnetic layersHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Apr 5, 2011·28 cites·16 claims
- 2095US7889456B2Perpendicular magnetic recording write head with flux shaping layers on the write pole and magnetic recording system incorporating the write headHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Feb 15, 2011·31 cites·21 claims
- 2195US7876527B2Magnetic disk deviceHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Jan 25, 2011·25 cites·10 claims
- 2295US7848065B2Magnetoresistive sensor having an anisotropic hard bias with high coercivityHITACHI GLOBAL STORAGE TECH NL·Filed 2006·Granted Dec 7, 2010·23 cites·10 claims
- 2395US7236324B2Apparatus, method and system for fabricating servo patterns on high density patterned mediaHITACHI GLOBAL STORAGE TECH NL·Filed 2005·Granted Jun 26, 2007·22 cites·32 claims
- 2494US8037394B2Techniques for generating bit reliability information in a post-processor using an error correction constraintHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Oct 11, 2011·38 cites·20 claims
- 2594US7961440B2Current perpendicular to plane magnetoresistive sensor with reduced read gapHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Jun 14, 2011·27 cites·21 claims
- 2694USD636395SDock for a portable storage device, or the likeHITACHI GLOBAL STORAGE TECH NL·Filed 2010·Granted Apr 19, 2011·77 cites·1 claims
- 2794US7920359B2Magnetic recording apparatus with correlated main magnetic pole-to-shields spacing and main magnetic pole-to-medium layers spacingHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Apr 5, 2011·21 cites·10 claims
- 2894US7876528B2Disk drive device and manufacturing method thereofHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Jan 25, 2011·21 cites·11 claims
- 2994US7848054B2Perpendicular magnetic write head having a corner notched conformal, wrap-around, trailing magnetic shield for reduced adjacent track interferenceHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Dec 7, 2010·16 cites·21 claims
- 3094US7508618B1Multivariate head-to-disk contact detectionHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Mar 24, 2009·19 cites·18 claims
- 3193US8373948B2Tunnel magnetoresistance (TMR) structures with MGO barrier and methods of making sameHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Feb 12, 2013·16 cites·22 claims
- 3293US8035922B2Write head with integrated coil and shield structureHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Oct 11, 2011·15 cites·25 claims
- 3393US8035923B2Data storage deviceHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Oct 11, 2011·16 cites·12 claims
- 3493US8000059B2Perpendicular magnetic write head with a thin wrap around magnetic shieldHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Aug 16, 2011·19 cites·4 claims
- 3593US7952831B2Perpendicular magnetic recording write head with notched trailing shieldHITACHI GLOBAL STORAGE TECH NL·Filed 2010·Granted May 31, 2011·16 cites·7 claims
- 3693US7881018B2Differential current perpendicular to plane giant magnetoresistive sensor structure having improved robustness against spin torque noiseHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Feb 1, 2011·16 cites·20 claims
- 3793US7852587B2Thermal assisted recording (TAR) disk drive capable of controlling the write pulsesHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Dec 14, 2010·17 cites·20 claims
- 3892US8018679B2Perpendicular magnetic recording write head with slanted magnetic write poleHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Sep 13, 2011·14 cites·14 claims
- 3992US7969684B2Write head design and method for reducing adjacent track interference at very narrow track widthsHITACHI GLOBAL STORAGE TECH NL·Filed 2006·Granted Jun 28, 2011·15 cites·12 claims
- 4092US7929254B2Disk drive device and carriage of actuator with damping memberHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Apr 19, 2011·16 cites·8 claims
- 4192US7916435B1Magnetic tunnel transistor having a base structure that provides polarization of unpolarized electrons from an emitter based upon a magnetic orientation of a free layer and a self-pinned layerHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Mar 29, 2011·12 cites·14 claims
- 4292US7869157B2Magnetic disk drive having dual actuatorHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Jan 11, 2011·17 cites·13 claims
- 4392US7848058B2Voice coil damperHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Dec 7, 2010·13 cites·16 claims
- 4492US7841068B2Methods of fabricating single-pole recording head having trapezoidal main pole and bevel angle promotion layerHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Nov 30, 2010·12 cites·11 claims
- 4592US7845011B2Data transfer system and data transfer methodHITACHI GLOBAL STORAGE TECH NL·Filed 2005·Granted Nov 30, 2010·32 cites·12 claims
- 4691US8054586B2Write head design and method for reducing adjacent track interference at very narrow track widthsHITACHI GLOBAL STORAGE TECH NL·Filed 2005·Granted Nov 8, 2011·11 cites·12 claims
- 4791US8027128B2Suspension and disk driveHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Sep 27, 2011·15 cites·20 claims
- 4891US8018691B2CPP dual free layer magnetoresistive head for magnetic data storageHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Sep 13, 2011·19 cites·22 claims
- 4991US8003236B2Method for making a master mold with high bit-aspect-ratio for nanoimprinting patterned magnetic recording disks, master mold made by the method, and disk imprinted by the master moldHITACHI GLOBAL STORAGE TECH NL·Filed 2008·Granted Aug 23, 2011·12 cites·5 claims
- 5091US7998607B2Partially-oxidized cap layer for hard disk drive magnetic mediaHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Aug 16, 2011·10 cites·28 claims
Showing the top 50 of 338 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when HITACHI GLOBAL STORAGE TECH NL files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →