Inventor · disambiguated record
Ryoichi Nakatani
Also filed as: NAKATANI RYOICHI
33 granted patents·1 pending application·835 citations·filing 1987–2014
98Inventor score
Top patents by PatentIndex Score
34 records- 0198US5390061AMultilayer magnetoresistance effect-type magnetic headHITACHI LTD·Filed 1991·Granted Feb 14, 1995·156 cites·27 claims
- 0295US6687099B2Magnetic 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
- 0394US5726837AMultilayer magnetoresistance effect-type magnetic headHITACHI LTD·Filed 1994·Granted Mar 10, 1998·43 cites·24 claims
- 0491US6201259B1Tunneling magnetoresistance element, and magnetic sensor, magnetic head and magnetic memory using the elementHITACHI LTD·Filed 1999·Granted Mar 13, 2001·81 cites·23 claims
- 0589US6011674AMagnetoresistance effect multilayer film with ferromagnetic film sublayers of different ferromagnetic material compositionsHITACHI LTD·Filed 1996·Granted Jan 4, 2000·33 cites·6 claims
- 0689US5287237AAntiferromagnetic 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
- 0789US4935311AMagnetic multilayered film and magnetic head using the sameHITACHI LTD·Filed 1988·Granted Jun 19, 1990·36 cites·15 claims
- 0888US6392849B2Magnetic head with dual spin valve element for differential operationHITACHI LTD·Filed 2001·Granted May 21, 2002·22 cites·14 claims
- 0986US6483677B2Magnetic disk apparatus including magnetic head having multilayered reproducing element using tunneling effectHITACHI LTD·Filed 2001·Granted Nov 19, 2002·11 cites·6 claims
- 1085US6483676B2Magnetic head with tunneling magnetoresistive element biased by current controllerHITACHI LTD·Filed 2001·Granted Nov 19, 2002·14 cites·7 claims
- 1183US7159303B2Method for manufacturing magnetic head deviceHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jan 9, 2007·7 cites·4 claims
- 1283US5998040AMultilayer which shows magnetoresistive effect and magnetoresistive element using the sameHITACHI LTD·Filed 1991·Granted Dec 7, 1999·49 cites·36 claims
- 1382US6469873B1Magnetic head and magnetic storage apparatus using the sameHITACHI LTD·Filed 1998·Granted Oct 22, 2002·35 cites·5 claims
- 1482US5290629AMagnetic film having a magnetic phase with crystallites of 200 A or less and an oxide phase present at the grain boundariesHITACHI LTD·Filed 1991·Granted Mar 1, 1994·32 cites·18 claims
- 1579US6278593B1Magnetoresistance effect elements and magnetic heads using the tunneling magnetoresistive effectHITACHI LTD·Filed 1999·Granted Aug 21, 2001·17 cites·64 claims
- 1678US6232777B1Tunneling magnetoresistive element and magnetic sensor using the sameHITACHI LTD·Filed 1998·Granted May 15, 2001·52 cites·24 claims
- 1776US4858049AMagnetic film and magnetic head using the sameHITACHI LTD·Filed 1987·Granted Aug 15, 1989·19 cites·28 claims
- 1873US7292417B2Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effectHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Nov 6, 2007·3 cites·7 claims
- 1970US4920013AMagnetic Multilayer structureHITACHI LTD·Filed 1987·Granted Apr 24, 1990·18 cites·9 claims
- 2069US7054120B2Magnetic 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
- 2168US4935314AFerromagnetic film and magnetic head using the sameHITACHI LTD·Filed 1988·Granted Jun 19, 1990·22 cites·7 claims
- 2264US7099185B2Magnetic memory array, method for recording in a magnetic memory array and method for reading out from a magnetic memory arrayUNIV OSAKA·Filed 2003·Granted Aug 29, 2006·12 cites·24 claims
- 2363US6339330B1Magnetic headHITACHI LTD·Filed 2000·Granted Jan 15, 2002·6 cites·11 claims
- 2462US6940750B2Magnetic memory, magnetic memory array, method for fabricating a magnetic memory, method for recording in a magnetic memory and method for reading out from a magnetic memoryUNIV OSAKA·Filed 2003·Granted Sep 6, 2005·11 cites·34 claims
- 2557US6525532B2Magnetic deviceHITACHI LTD·Filed 2001·Granted Feb 25, 2003·6 cites·6 claims
- 2656US6418001B1Tunneling magnetoresistive element using a bias magnetic fieldHITACHI LTD·Filed 1999·Granted Jul 9, 2002·8 cites·5 claims
- 2753US4891278AFerrromagnetic thin film and magnetic head using itHITACHI LTD·Filed 1987·Granted Jan 2, 1990·15 cites·25 claims
- 2847US5879798AHeat resistant, high saturation magnetic flux density filmHITACHI LTD·Filed 1990·Granted Mar 9, 1999·6 cites·20 claims
- 2947US5247415AMagnetic head having main and auxiliary magnetic pathsHITACHI LTD·Filed 1992·Granted Sep 21, 1993·6 cites·34 claims
- 3046US6950332B2Magnetic memory element with vortex magnetization to control magnetization rotation and prevent leakage of magnetic fluxUNIV OSAKA·Filed 2003·Granted Sep 27, 2005·4 cites·19 claims
- 3145US6556393B2Magnetic recording apparatus with tunneling magnetoresistive element biased by current controllerHITACHI LTD·Filed 2002·Granted Apr 29, 2003·0 cites·1 claims
- 3239US2002190713A1Magnetic deviceFiled 2002·Application pending·0 cites
- 3337US9482692B2Magnetic field value measuring device and method for measuring magnetic field valueUNIV AKITA·Filed 2014·Granted Nov 1, 2016·0 cites·12 claims
- 3435US6771474B2Magnetic head with tunneling multi-layer magnetoresistive element biased by current controllerHITACHI LTD·Filed 2002·Granted Aug 3, 2004·0 cites·3 claims
Join the waitlist — get patent alerts
Get an alert when Ryoichi Nakatani files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →