Inventor · disambiguated record
Tetsuya Roppongi
Also filed as: ROPPONGI TETSUYA
79 granted patents·1 pending application·1,158 citations·filing 1998–2024
99Inventor score
Top patents by PatentIndex Score
80 records- 0198US11568891B1Magnetic flux guiding device with spin torque oscillator (STO) film having negative spin polarization layers in assisted writing applicationHEADWAY TECH INC·Filed 2021·Granted Jan 31, 2023·18 cites·19 claims
- 0298US10937450B1Magnetic flux guiding device with spin torque oscillator (STO) film having one or more negative spin polarization layers in assisted writing applicationHEADWAY TECH INC·Filed 2020·Granted Mar 2, 2021·23 cites·27 claims
- 0397US9934797B2Multilayer element including base multilayer body, magnetic sensor and microwave assisted magnetic headTDK CORP·Filed 2016·Granted Apr 3, 2018·33 cites·11 claims
- 0497US8325567B2Thermally-assisted magnetic recording head comprising near-field light generatorMIYAUCHI DAISUKE·Filed 2009·Granted Dec 4, 2012·38 cites·20 claims
- 0596US11289117B1Magnetic head including spin torque oscillatorSASAKI YOSHITAKA·Filed 2021·Granted Mar 29, 2022·10 cites·13 claims
- 0696US10121497B1Magnetic recording head with spin torque oscillator layers satisfying width, thickness and angle relationship formulasTDK CORP·Filed 2017·Granted Nov 6, 2018·127 cites·16 claims
- 0796US10032470B1Magnetic recording head with spin torque oscillator, head gimbal assembly and magnetic recording apparatusTDK CORP·Filed 2017·Granted Jul 24, 2018·34 cites·9 claims
- 0896US9824701B2Microwave assisted magnetic recording head with spin torque oscillator corner angle relationship, head gimbal assembly, and magnetic recording deviceTDK CORP·Filed 2016·Granted Nov 21, 2017·35 cites·12 claims
- 0996US7443633B2Thin-film magnetic head for perpendicular magnetic recording and manufacturing method of thin-film magnetic headTDK CORP·Filed 2005·Granted Oct 28, 2008·45 cites·42 claims
- 1095US11211082B1Magnetic head including spin torque oscillatorSASAKI YOSHITAKA·Filed 2021·Granted Dec 28, 2021·7 cites·13 claims
- 1195US10522174B1Magnetic flux guiding device with antiferromagnetically coupled (AFC) spin polarizer in assisted writing applicationHEADWAY TECH INC·Filed 2019·Granted Dec 31, 2019·22 cites·16 claims
- 1295US10109302B1Magnetic recording head with spin torque oscillator, head gimbal assembly and magnetic recording apparatusTDK CORP·Filed 2017·Granted Oct 23, 2018·23 cites·9 claims
- 1395US8077559B1Thermally-assisted magnetic recording head including plasmon generatorMIYAUCHI DAISUKE·Filed 2010·Granted Dec 13, 2011·44 cites·16 claims
- 1495US7791838B2Magnetic head apparatus and magnetic recording and reproducing apparatusTDK CORP·Filed 2007·Granted Sep 7, 2010·24 cites·20 claims
- 1595US6952325B2Thin film magnetic head and method of manufacturing the sameTDK CORP·Filed 2002·Granted Oct 4, 2005·82 cites·7 claims
- 1694US7885029B2Thermally-assisted magnetic recording head and thermally-assisted magnetic recording methodTDK CORP·Filed 2009·Granted Feb 8, 2011·17 cites·19 claims
- 1793US7974046B2Thin-film magnetic head with heating portion and protrusion adjustment portion, head gimbal assembly equipped head, magnetic recording/reproducing apparatus equipped HGA, and manufacturing method of headTDK CORP·Filed 2007·Granted Jul 5, 2011·17 cites·19 claims
- 1892US12094497B1Optimizing a current distribution in write heads for efficient energy-assisted magnetic recordingHEADWAY TECH INC·Filed 2023·Granted Sep 17, 2024·3 cites·20 claims
- 1992US10490216B1Magnetic flux guiding device with antiferromagnetically coupled (AFC) oscillator in assisted writing applicationHEADWAY TECH INC·Filed 2018·Granted Nov 26, 2019·13 cites·36 claims
- 2092US8144437B2Magnetoresistive element and thin film magnetic headMIYAUCHI DAISUKE·Filed 2010·Granted Mar 27, 2012·19 cites·11 claims
- 2192US7245454B2Magnetic head for vertical magnetic recording including main pole layer having varying width and thickness, head gimbal assembly, and hard disk driveTDK CORP·Filed 2004·Granted Jul 17, 2007·44 cites·9 claims
- 2292US7206166B2Thin film magnetic head and method of manufacturing the sameTDK CORP·Filed 2003·Granted Apr 17, 2007·39 cites·12 claims
- 2391US11514931B1Magnetic head including main pole having top surface including first inclined portion, second inclined portion, and third inclined portion, and spin torque oscillatorARAKI HIRONORI·Filed 2022·Granted Nov 29, 2022·3 cites·10 claims
- 2491US7154707B2Thin film magnetic head and magnetic recording apparatusSAE MAGNETICS HK LTD·Filed 2004·Granted Dec 26, 2006·32 cites·9 claims
- 2590US8094399B2Magnetic recording apparatus provided with microwave-assisted headROPPONGI TETSUYA·Filed 2010·Granted Jan 10, 2012·23 cites·9 claims
- 2689US10424326B1Magnetic flux guiding device with antiferromagnetically coupled (AFC) spin polarizer in assisted writing applicationHEADWAY TECH INC·Filed 2018·Granted Sep 24, 2019·10 cites·36 claims
- 2789US8462594B1Thermally-assisted magnetic recording head capable of preventing propagated light being absorbed by magnetic poleAOKI SUSUMU·Filed 2012·Granted Jun 11, 2013·15 cites·17 claims
- 2889US8264916B1Microwave assisted magnetic head and magnetic disk deviceAOYAMA TSUTOMU·Filed 2011·Granted Sep 11, 2012·14 cites·9 claims
- 2989US6728064B2Thin-film magnetic head having two magnetic layers, one of which includes a pole portion layer and a yoke portion layer, and method of manufacturing sameTDK CORP·Filed 2002·Granted Apr 27, 2004·27 cites·17 claims
- 3089US6317294B1Slider with negative and multiple positive pressure generation portions and head including the sameTDK CORP·Filed 2000·Granted Nov 13, 2001·25 cites·57 claims
- 3187US10748559B1Magnetic head including spin torque oscillator and manufacturing method for the sameARAKI HIRONORI·Filed 2020·Granted Aug 18, 2020·3 cites·9 claims
- 3287US9741373B1Microwave assisted magnetic head, head gimbal assembly, and magnetic recording deviceTDK CORP·Filed 2016·Granted Aug 22, 2017·9 cites·8 claims
- 3386US8437230B2Heat-assisted magnetic write head, head gimbals assembly, head arm assembly, and magnetic disk deviceAOKI SUSUMU·Filed 2011·Granted May 7, 2013·10 cites·9 claims
- 3486US8374062B2Heat assist magnetic write head, head gimbals assembly, head arm assembly, and magnetic disk deviceTDK CORP·Filed 2010·Granted Feb 12, 2013·8 cites·11 claims
- 3586US8325570B1Thermally-assisted magnetic recording head including a protruding memberTANAKA KOSUKE·Filed 2012·Granted Dec 4, 2012·10 cites·12 claims
- 3686US8208349B2Thermally-assisted magnetic recording head having a gap between propagation edge and magnetic poleTANAKA KOSUKE·Filed 2010·Granted Jun 26, 2012·9 cites·14 claims
- 3786US8077558B1Thermally-assisted magnetic recording head including plasmon generatorTSUTSUMI TAKESHI·Filed 2010·Granted Dec 13, 2011·16 cites·14 claims
- 3885US7920357B2Magnetic recording method using ferromagnetic resonance and thin-film magnetic head for using the methodTDK CORP·Filed 2007·Granted Apr 5, 2011·6 cites·46 claims
- 3985US7219414B2Method of manufacturing magnetic head for perpendicular magnetic recordingTDK CORP·Filed 2005·Granted May 22, 2007·16 cites·7 claims
- 4085US6922316B2Thin-film magnetic head and method of manufacturing sameTDK CORP·Filed 2001·Granted Jul 26, 2005·20 cites·54 claims
- 4185US6707643B2Perpendicular magnetic recording head having narrow recording gap and perpendicular magnetic recording apparatus using the sameTOSHIBA KK·Filed 2001·Granted Mar 16, 2004·19 cites·15 claims
- 4285US6144529ASlider with negative and positive pressure generating portions and head including the sameTDK CORP·Filed 1998·Granted Nov 7, 2000·40 cites·44 claims
- 4384US8164986B2Thermally-assisted magnetic recording head and thermally-assisted magnetic recording methodAOKI SUSUMU·Filed 2009·Granted Apr 24, 2012·6 cites·17 claims
- 4482US9153267B1Thermally-assisted magnetic recording head, head gimbals assembly, head arm assembly and magnetic recording unitTDK CORP·Filed 2014·Granted Oct 6, 2015·5 cites·8 claims
- 4581US8358127B2Apparatus for measuring magnetic field of microwave-assisted headTDK CORP·Filed 2010·Granted Jan 22, 2013·4 cites·9 claims
- 4681US6738222B2Thin-film magnetic head and method of manufacturing sameTDK CORP·Filed 2001·Granted May 18, 2004·15 cites·11 claims
- 4781US6639754B2Perpendicular magnetic recording head and perpendicular magnetic recording apparatusTOSHIBA KK·Filed 2001·Granted Oct 28, 2003·15 cites·10 claims
- 4880US10839829B1Magnetic head with a main pole including first and second layers and manufacturing method for the sameSASAKI YOSHITAKA·Filed 2019·Granted Nov 17, 2020·4 cites·18 claims
- 4980US8125857B2Heat-assisted magnetic recording head including plasmon generatorTANAKA KOSUKE·Filed 2010·Granted Feb 28, 2012·5 cites·9 claims
- 5080US7508626B2Thin film magnetic head having magnetic pole with controlled dimensionsTDK CORP·Filed 2003·Granted Mar 24, 2009·14 cites·4 claims
Showing the top 50 of 80 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →