Inventor · disambiguated record
Yohji Maruyama
Also filed as: MARUYAMA YOHJI
50 granted patents·2 pending applications·623 citations·filing 1995–2016
98Inventor score
Technology areasG11B
Files withHITACHI LTD23HGST Netherlands BV7HITACHI GLOBAL STORAGE TECH5HITACHI GLOBAL STORAGE TECH NL5KUDO KAZUE2
Top patents by PatentIndex Score
52 records- 0196US7443625B2Magnetic disk driveHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 28, 2008·29 cites·10 claims
- 0295US9672846B1STO bias control for MAMR head reliabilityHGST Netherlands BV·Filed 2016·Granted Jun 6, 2017·20 cites·16 claims
- 0395US9230573B1Magnetic recording head with non-magnetic bump structure formed on spin torque oscillatorHGST Netherlands BV·Filed 2015·Granted Jan 5, 2016·20 cites·20 claims
- 0495US9142227B1Microwave assisted magnetic recording (MAMR) write head and systemHGST Netherlands BV·Filed 2014·Granted Sep 22, 2015·31 cites·12 claims
- 0595US6404594B1Magnetic disk drive with integrated electrical conductors for recording elementHITACHI LTD·Filed 2000·Granted Jun 11, 2002·55 cites·13 claims
- 0694US7920359B2Magnetic 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
- 0791US8248732B2Head-gimbal assembly including a transmission-line structure for high-density magnetic recordingNISHIYAMA NOBUMASA·Filed 2009·Granted Aug 21, 2012·15 cites·11 claims
- 0891US8223458B2Magnetic head having an asymmetrical shape and systems thereofMOCHIZUKI MASAFUMI·Filed 2010·Granted Jul 17, 2012·46 cites·16 claims
- 0990US6212024B1Recording equalizer and magnetic recording/reproducing apparatus performing write timing compensationHITACHI LTD·Filed 1998·Granted Apr 3, 2001·44 cites·9 claims
- 1090US6034847AApparatus and thin film magnetic head with magnetic membrane layers of different resistivityHITACHI LTD·Filed 1997·Granted Mar 7, 2000·64 cites·10 claims
- 1189US6530141B2Method of forming thin film magnetic recording head with narrow track width performing high density recording at high driving frequencyHITACHI LTD·Filed 2001·Granted Mar 11, 2003·24 cites·12 claims
- 1288US6894874B2Disk drive having magnetic head conduction paths with arrangements to control impedanceHITACHI LTD·Filed 2003·Granted May 17, 2005·17 cites·10 claims
- 1387US8477455B2Noise and particle shield for contact sensor in a sliderFURUKAWA MASARU·Filed 2010·Granted Jul 2, 2013·11 cites·6 claims
- 1487US6683823B2Method for reproducing information on a recording mediumHITACHI LTD·Filed 2002·Granted Jan 27, 2004·22 cites·3 claims
- 1584US7460335B2Magnetic head having first and second protective films with different coefficients of linear expansionHITACHI GLOBAL TECHNOLOGIES JA·Filed 2006·Granted Dec 2, 2008·8 cites·20 claims
- 1682US8064161B2Perpendicular magnetic recording head and method for manufacturing the sameKUDO KAZUE·Filed 2008·Granted Nov 22, 2011·6 cites·18 claims
- 1781US6091582AThin film magnetic recording head with very narrow track width performing high density recording at high driving frequencyHITACHI LTD·Filed 1998·Granted Jul 18, 2000·31 cites·14 claims
- 1880US7842408B2Magnetic film, manufacturing method thereof and thin film magnetic headHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Nov 30, 2010·4 cites·9 claims
- 1979US9230566B1Perpendicular magnetic write head having a controlled magnetization state shieldHGST Netherlands BV·Filed 2014·Granted Jan 5, 2016·4 cites·20 claims
- 2079US6529348B2Magnetic disk apparatus having an electric conducting path with a defined characteristic impedance and which interconnects a write element and a read/write integrated circuitHITACHI LTD·Filed 2002·Granted Mar 4, 2003·9 cites·7 claims
- 2178US7995311B2Magnetic shield, manufacturing method thereof and thin film magnetic head employing the sameHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Aug 9, 2011·3 cites·18 claims
- 2277US8300358B2Magnetic head having write pole, first soft magnetic films separately disposed on both sides of the main pole, and a second soft magnetic film disposed on a trailing side of the main poleMARUYAMA YOHJI·Filed 2008·Granted Oct 30, 2012·4 cites·11 claims
- 2377US6356402B2Recording equalizer and magnetic recording/reproducing apparatus using the equalizerHITACHI LTD·Filed 2001·Granted Mar 12, 2002·8 cites·7 claims
- 2476US8373940B2Magnetic head having a facing electrode pair for generating an electromagnetic field and applying energy to the magnetic recording layerHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Feb 12, 2013·2 cites·18 claims
- 2573US8351156B2Perpendicular magnetic recording head having a main pole and first and second magnetic films peripheral to the main pole and having different depths from an air bearing surfaceHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Jan 8, 2013·2 cites·19 claims
- 2672US7064925B2Magnetic head for reducing projection of retrieving and writing unit from float surface, and magnetic recording/retrieving apparatus using the sameHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Jun 20, 2006·7 cites·19 claims
- 2771US9099127B1Dual magnetic sensor for multi-input magnetic recordingHGST Netherlands BV·Filed 2014·Granted Aug 4, 2015·2 cites·12 claims
- 2871US8570683B2Low permeability material for a side shield in a perpendicular magnetic headTAKAHASHI YUSUKE·Filed 2011·Granted Oct 29, 2013·2 cites·20 claims
- 2971US8542462B2Perpendicular magnetic recording head having a non-magnetic film recessed from the air bearing surface for improved high-density magnetic recordingMARUYAMA YOHJI·Filed 2010·Granted Sep 24, 2013·3 cites·18 claims
- 3071US7016156B2Disk drive having magnetic head conduction paths with arrangements to control impedanceHITACHI LTD·Filed 2004·Granted Mar 21, 2006·5 cites·2 claims
- 3171US6327112B1Adjacent track position detectable information storage apparatusHITACHI LTD·Filed 1999·Granted Dec 4, 2001·22 cites·12 claims
- 3270US6795272B2Thin film magnetic head and magnetic storage apparatusHITACHI LTD·Filed 2002·Granted Sep 21, 2004·6 cites·10 claims
- 3367US8189293B1Perpendicular magnetic recording head having a grooved wrap around shield and method for manufacturing the sameWAKABAYASHI YASUHIRO·Filed 2011·Granted May 29, 2012·3 cites·20 claims
- 3467US6728051B2Recording equalizer and magnetic recording/reproducing apparatus using the equalizerHITACHI LTD·Filed 2003·Granted Apr 27, 2004·4 cites·2 claims
- 3567US6104574AMagnetic head with a magnetic pole sandwiched between conductive materialsHITACHI LTD·Filed 1995·Granted Aug 15, 2000·19 cites·4 claims
- 3666US9076462B2Magnetic head having a short yoke with a tapered coil structureHGST Netherlands BV·Filed 2013·Granted Jul 7, 2015·1 cites·19 claims
- 3762US8786986B2Head-slider including thin-film magnetic-recording head having reduced thermal protrusionFUJITA SHIGEO·Filed 2009·Granted Jul 22, 2014·1 cites·6 claims
- 3861US5875082AMagnetic recording media, magnetic heads and magnetic read-write apparatus using the sameHITACHI LTD·Filed 1997·Granted Feb 23, 1999·12 cites·16 claims
- 3959US7110218B2Inductive head and magnetic disk apparatusHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Sep 19, 2006·3 cites·6 claims
- 4058US6349008B1Magnetic recording media, magnetic heads and magnetic read-write apparatus using the sameHITACHI LTD·Filed 1998·Granted Feb 19, 2002·11 cites·8 claims
- 4155US6721132B2Inductive head and magnetic disk apparatusHITACHI LTD·Filed 2001·Granted Apr 13, 2004·2 cites·13 claims
- 4255US5898540AMagnetic head and slider configuration for contact recording having a plurality of tapered surfacesHITACHI LTD·Filed 1996·Granted Apr 27, 1999·11 cites·9 claims
- 4354US6549355B2Recording equalizer and magnetic recording/reproducing apparatus using the equalizerHITACHI LTD·Filed 2002·Granted Apr 15, 2003·1 cites·6 claims
- 4454US6487031B2Recording equalizer and magnetic recording/reproducing apparatus using the equalizerHITACHI LTD·Filed 2002·Granted Nov 26, 2002·1 cites·9 claims
- 4552US9330687B2Microwave-assisted recording head with stable oscillationHGST Netherlands BV·Filed 2013·Granted May 3, 2016·0 cites·20 claims
- 4652US7057838B2Magnetic disk device having a write head to write by shifting in a radial directionHITACHI LTD·Filed 2003·Granted Jun 6, 2006·1 cites·17 claims
- 4747US2005007698A1Thin film magnetic head and magnetic storage apparatusFiled 2004·Application pending·0 cites
- 4845US7333301B2Magnetic recording head and method for manufacturingHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Feb 19, 2008·0 cites·24 claims
- 4945US6661613B2Magnetic disk driveHITACHI LTD·Filed 2002·Granted Dec 9, 2003·0 cites·5 claims
- 5045US6560168B1Information recording/reproducing deviceHITACHI LTD·Filed 1998·Granted May 6, 2003·6 cites·28 claims
Showing the top 50 of 52 patent records by PatentIndex Score.
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