Inventor · disambiguated record
Naoki Koyama
Also filed as: KOYAMA NAOKI · TANABE HIDEO
38 granted patents·4 pending applications·839 citations·filing 1980–2011
98Inventor score
Files withHITACHI LTD30HITACHI GLOBAL STORAGE TECH7CANON KASEI KK3CANON KK1HITACHI GLOBAL STORAGE TECH NL1
Top patents by PatentIndex Score
42 records- 0198US5390061AMultilayer magnetoresistance effect-type magnetic headHITACHI LTD·Filed 1991·Granted Feb 14, 1995·156 cites·27 claims
- 0296US5168409AIntegrated magnetic head having a magnetic layer functioning as both a magnetic shield and a magnetic poleHITACHI LTD·Filed 1990·Granted Dec 1, 1992·93 cites·32 claims
- 0395US6687099B2Magnetic head with conductors formed on endlayers of a multilayer film having magnetic layer coercive force differenceHITACHI LTD·Filed 2002·Granted Feb 3, 2004·33 cites·10 claims
- 0494US5850326ANarrow track thin film magnetic head suitable for high density recording and reproducing operations and fabrication method thereof wherein an air bearing surface has at least one groove containing a non-magnetic electrically conductive layerHITACHI LTD·Filed 1994·Granted Dec 15, 1998·45 cites·77 claims
- 0594US5726837AMultilayer magnetoresistance effect-type magnetic headHITACHI LTD·Filed 1994·Granted Mar 10, 1998·43 cites·24 claims
- 0689US6011674AMagnetoresistance effect multilayer film with ferromagnetic film sublayers of different ferromagnetic material compositionsHITACHI LTD·Filed 1996·Granted Jan 4, 2000·33 cites·6 claims
- 0789US5287237AAntiferromagnetic film superior in corrosion resistance, magnetoresistance-effect element and magnetoresistance-effect head including such thin filmHITACHI LTD·Filed 1991·Granted Feb 15, 1994·71 cites·12 claims
- 0888US5461526AMagnetoresistive read head and magnetic storage system using the sameHITACHI LTD·Filed 1993·Granted Oct 24, 1995·46 cites·17 claims
- 0987US6839200B2Combination perpendicular magnetic head having shield material formed at both ends of an upper pole of a write elementHITACHI LTD·Filed 2003·Granted Jan 4, 2005·12 cites·2 claims
- 1087US6538844B2Method of fabricating a magnetic head by focused ion beam etchingHITACHI LTD·Filed 2002·Granted Mar 25, 2003·13 cites·5 claims
- 1186US6483677B2Magnetic disk apparatus including magnetic head having multilayered reproducing element using tunneling effectHITACHI LTD·Filed 2001·Granted Nov 19, 2002·11 cites·6 claims
- 1285US7586715B2Magnetic head with a narrow spacing between magnetic shields at air bearing surfaceHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Sep 8, 2009·7 cites·10 claims
- 1384US7727135B2Conductive rubber rollerCANON KASEI KK·Filed 2006·Granted Jun 1, 2010·10 cites·7 claims
- 1484US5126907AThin film magnetic head having at least one magnetic core member made at least partly of a material having a high saturation magnetic flux densityHITACHI LTD·Filed 1990·Granted Jun 30, 1992·38 cites·23 claims
- 1583US7159303B2Method for manufacturing magnetic head deviceHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jan 9, 2007·7 cites·4 claims
- 1681US5337203AMagnetoresistive magnetic headHITACHI LTD·Filed 1992·Granted Aug 9, 1994·23 cites·34 claims
- 1779US6278593B1Magnetoresistance effect elements and magnetic heads using the tunneling magnetoresistive effectHITACHI LTD·Filed 1999·Granted Aug 21, 2001·17 cites·64 claims
- 1877US5808843AMagnetoresistance effect reproduction headHITACHI LTD·Filed 1992·Granted Sep 15, 1998·25 cites·10 claims
- 1974US7382576B2Thin film magnetic head and magnetic disk apparatus including the sameHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jun 3, 2008·5 cites·8 claims
- 2070US6307707B1Narrow track thin film head including magnetic poles machined by focused ion beam etchingHITACHI LTD·Filed 2000·Granted Oct 23, 2001·4 cites·5 claims
- 2170US6278578B1Narrow track thin film head having a focused ion beam etched air bearing surfaceHITACHI LTD·Filed 2000·Granted Aug 21, 2001·4 cites·4 claims
- 2269US7054120B2Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effectHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted May 30, 2006·7 cites·7 claims
- 2369US4922360AMagnetic headHITACHI LTD·Filed 1988·Granted May 1, 1990·15 cites·5 claims
- 2468US7675715B2Magnetoresistive head and fabricating method thereof, and read write separation type headHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Mar 9, 2010·6 cites·18 claims
- 2568US4415262APhotomaskHITACHI LTD·Filed 1982·Granted Nov 15, 1983·28 cites·24 claims
- 2662US6483663B2Thin film magnetic head and magnetic disk apparatus including the sameHITACHI LTD·Filed 1999·Granted Nov 19, 2002·14 cites·6 claims
- 2761US6877212B2Manufacturing method of a thin film magnetic headHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Apr 12, 2005·6 cites·4 claims
- 2860US6111723ANarrow track thin film magnetic head suitable for high density recording and reproducing operations and fabrication method thereof wherein an air bearing surface has at least one groove containing a non-magnetic electrically conductive layerHITACHI LTD·Filed 1998·Granted Aug 29, 2000·8 cites·39 claims
- 2957US6665141B2Magnetic head having track width defined by trench portions filled with magnetic shield materialHITACHI LTD·Filed 2003·Granted Dec 16, 2003·1 cites·5 claims
- 3055US5212609AMagnetoresistive headHITACHI LTD·Filed 1991·Granted May 18, 1993·15 cites·9 claims
- 3155US4502916AProcess for forming fine patternsHITACHI LTD·Filed 1984·Granted Mar 5, 1985·19 cites·7 claims
- 3254US7068467B2Thin film magnetic head and magnetic disk apparatus including the sameHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Jun 27, 2006·3 cites·25 claims
- 3352US7957109B2Magnetic head of magnetoresistance effect type with high resistance to external stressHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Jun 7, 2011·0 cites·5 claims
- 3450US5719729AMagnetic head and recording and reproducing apparatus having an arrangement for improving coincidence between a magnetic center of a read head and physical center of a write headHITACHI LTD·Filed 1992·Granted Feb 17, 1998·8 cites·4 claims
- 3543US2002071210A1Thin film magnetic heads and a method of producing the sameHITACHI LTD·Filed 2002·Application pending·0 cites
- 3643US2002060880A1Thin film magnetic heads and a method of producing the sameHITACHI LTD·Filed 2002·Application pending·0 cites
- 3741US4354203ALens control mechanism for television cameraCANON KK·Filed 1980·Granted Oct 12, 1982·5 cites·4 claims
- 3839US2009162109A1Conductive rubber roller and transfer rollerCANON KASEI KK·Filed 2008·Application pending·0 cites
- 3937US5521005AMagnetoresistive headHITACHI LTD·Filed 1992·Granted May 28, 1996·4 cites·20 claims
- 4037US4503517AMagnetic bubble memory deviceHITACHI LTD·Filed 1983·Granted Mar 5, 1985·3 cites·4 claims
- 4136US2011194880A1Transfer rollerCANON KASEI KK·Filed 2011·Application pending·0 cites
- 4230US4772505AMagnetic bubble memory elementHITACHI LTD·Filed 1986·Granted Sep 20, 1988·1 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →