Inventor · disambiguated record
Nobumasa Nishiyama
Also filed as: NISHIYAMA NOBUMASA
47 granted patents·4 pending applications·546 citations·filing 1984–2020
98Inventor score
Files withHITACHI LTD13HITACHI GLOBAL STORAGE TECH11HGST Netherlands BV6CONTRERAS JOHN T4WESTERN DIGITAL TECH INC4
Top patents by PatentIndex Score
51 records- 0195US8189281B2Magnetic recording disk drive with write driver to write head transmission line having non-uniform sections for optimal write current pulse overshootALEX MICHAEL·Filed 2009·Granted May 29, 2012·27 cites·12 claims
- 0295US7804663B2High frequency interconnect signal transmission linesHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Sep 28, 2010·26 cites·20 claims
- 0394US7352535B2Method and apparatus for reducing crosstalk and signal loss in flexing interconnects of an electrical lead suspensionHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Apr 1, 2008·19 cites·26 claims
- 0493US10594100B1Flexible type electrical feed-through connector assemblyWESTERN DIGITAL TECH INC·Filed 2018·Granted Mar 17, 2020·15 cites·21 claims
- 0591US8248732B2Head-gimbal assembly including a transmission-line structure for high-density magnetic recordingNISHIYAMA NOBUMASA·Filed 2009·Granted Aug 21, 2012·15 cites·11 claims
- 0688US8598460B2Interleaved conductor structure with offset tracesCONTRERAS JOHN T·Filed 2010·Granted Dec 3, 2013·11 cites·32 claims
- 0788US7440217B2On the fly write head flyheight detectorHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 21, 2008·8 cites·18 claims
- 0887US8310789B2Conductor suspension structure and electrical connection assembly for transmitting complementary signals in a hard disk driveCONTRERAS JOHN T·Filed 2009·Granted Nov 13, 2012·8 cites·20 claims
- 0986US9558790B1Hermetic sealing with high-speed transmission for hard disk driveHGST Netherlands BV·Filed 2016·Granted Jan 31, 2017·7 cites·20 claims
- 1086US8068313B2Microactuator, head gimbal assembly, and disk drive deviceNISHIYAMA NOBUMASA·Filed 2008·Granted Nov 29, 2011·8 cites·20 claims
- 1186US7319573B2Magnetic disk drive having a suspension mounted transmission line including read and write conductors and a lower conductorHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Jan 15, 2008·136 cites·14 claims
- 1286US5367411AMagnetic recording and reproducing apparatus with reproducing head of magnetoresistive type having control of magnetic bias levelHITACHI LTD·Filed 1992·Granted Nov 22, 1994·40 cites·10 claims
- 1385US7969681B2Disk drive and control method thereofHITACHI GLOBAL STORAGE TECH NL·Filed 2007·Granted Jun 28, 2011·7 cites·11 claims
- 1485US7684153B2Magnetic head slider with ground and heater terminal arrangement and magnetic head assemblyHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Mar 23, 2010·6 cites·10 claims
- 1581US9704520B1Flex-HGA connector assembly for hard disk driveWESTERN DIGITAL TECH INC·Filed 2017·Granted Jul 11, 2017·5 cites·20 claims
- 1681US7489479B2Electrical lead suspension having partitioned air slotsHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Feb 10, 2009·9 cites·39 claims
- 1781US6992850B2Magnetic disk drive reducing influence of rigidity of transmission lines on suspensionHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Jan 31, 2006·14 cites·12 claims
- 1881US4907100AReadout circuit in magnetic recording deviceHITACHI LTD·Filed 1988·Granted Mar 6, 1990·24 cites·13 claims
- 1980US9870806B2Hermetic sealing with high-speed transmission for hard disk driveHGST Netherlands BV·Filed 2017·Granted Jan 16, 2018·4 cites·20 claims
- 2079US9841457B1Pseudo flexure for disk drive and method of testing electronic circuit for disk driveNHK SPRING CO LTD·Filed 2016·Granted Dec 12, 2017·5 cites·15 claims
- 2179US9036305B1Magnetic recording disk drive with write driver to write head transmission line with multiple segments having different numbers of conductive tracesHGST Netherlands BV·Filed 2013·Granted May 19, 2015·4 cites·10 claims
- 2277US5715110AMagnetic recording and reproducing apparatus with thermal asperity correctionHITACHI LTD·Filed 1994·Granted Feb 3, 1998·26 cites·6 claims
- 2377US4774601ARead channel for magnetic recordingHITACHI LTD·Filed 1986·Granted Sep 27, 1988·21 cites·7 claims
- 2476US8675311B2Interleaved conductor structure with wrap around tracesCONTRERAS JOHN T·Filed 2010·Granted Mar 18, 2014·4 cites·26 claims
- 2576US8373940B2Magnetic 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
- 2675US8102628B2Disk drive and head assembly having hole sequencesOTA RYOHEI·Filed 2007·Granted Jan 24, 2012·6 cites·9 claims
- 2772US8982502B2Hard disk drive with write assist based on detected conditionsMORINAGA AKIRA·Filed 2011·Granted Mar 17, 2015·4 cites·19 claims
- 2872US8194356B2Head-stack assembly including heat-dissipation and impedance-matching structure and hard-disk drive using the head-stack assemblyNAGAOKA KAZUHIRO·Filed 2009·Granted Jun 5, 2012·3 cites·20 claims
- 2972US7724475B2Conductive member, disk drive using same, and conductive member fabricating methodHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted May 25, 2010·4 cites·17 claims
- 3071US9036306B1Grounding for a hard disk drive suspension tailHGST Netherlands BV·Filed 2013·Granted May 19, 2015·2 cites·21 claims
- 3168US9165596B1Magnetic recording disk drive with multiple preamplifiers and common transmission line with impedance compensationHGST Netherlands BV·Filed 2015·Granted Oct 20, 2015·3 cites·19 claims
- 3268US7417209B2Recording disk drive with reduced noise thermal flyheight controlHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Aug 26, 2008·1 cites·9 claims
- 3363US7983005B2Thin film magnetic head with flying height adjustment capabilityHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Jul 19, 2011·1 cites·11 claims
- 3458US5337198ADigital magnetic writing and reading apparatusHITACHI LTD·Filed 1992·Granted Aug 9, 1994·12 cites·15 claims
- 3558US5008761AReadout circuit in magnetic recording deviceHITACHI LTD·Filed 1990·Granted Apr 16, 1991·10 cites·10 claims
- 3653US5572379AMagnetic recording drive having arrangements for average useful life of magnetorestive effects sensorsHITACHI LTD·Filed 1994·Granted Nov 5, 1996·6 cites·8 claims
- 3752US11419213B2Multilayer flex circuit with non-plated outer metal layerWESTERN DIGITAL TECH INC·Filed 2020·Granted Aug 16, 2022·0 cites·20 claims
- 3852US4644424AEqualizer used for magnetic storage deviceHITACHI LTD·Filed 1984·Granted Feb 17, 1987·7 cites·14 claims
- 3951US5740142AMethod and apparatus for fast transfer of data in recording and reproducing systemHITACHI LTD·Filed 1996·Granted Apr 14, 1998·9 cites·20 claims
- 4051US5307213AData reproducing apparatus for eliminating undershoots in the vicinity of the outer edges of a magnetic poleHITACHI LTD·Filed 1991·Granted Apr 26, 1994·8 cites·12 claims
- 4148US9275664B2Shielded flex cable for use in a disk driveHGST Netherlands BV·Filed 2013·Granted Mar 1, 2016·0 cites·10 claims
- 4246US9570096B2Read path compensation for SNR and signal transferCONTRERAS JOHN·Filed 2010·Granted Feb 14, 2017·0 cites·20 claims
- 4345US10575424B2Hermetic sealed electrical connector with high-speed transmission for hard disk driveWESTERN DIGITAL TECH INC·Filed 2017·Granted Feb 25, 2020·0 cites·20 claims
- 4442US4823208AMulti slice level signal circuitHITACHI LTD·Filed 1987·Granted Apr 18, 1989·5 cites·17 claims
- 4540US2004109253A1Magnetic recording disk drive and method for ensuring magnetic recording function thereofHITACHI GLOBAL STORAGE TECH·Filed 2003·Application pending·0 cites
- 4639US2012160548A1Interleaved conductor structure with traces of varying widthCONTRERAS JOHN T·Filed 2010·Application pending·0 cites
- 4738US2012008237A1Wide-bandwidth dielectric windowing for conductor suspension structureCONTRERAS JOHN THOMAS·Filed 2010·Application pending·0 cites
- 4837US5721942APersonal information display system for serving large capacities of general information to user-designated stations at user-designated timesHITACHI MAXELL·Filed 1991·Granted Feb 24, 1998·14 cites·15 claims
- 4936US2012140360A1Integrated lead suspension (ils) for use with a dual stage actuator (dsa)CONTRERAS JOHN·Filed 2010·Application pending·0 cites
- 5031US6069762AMagnetic recording drive having arrangement for averaging useful life of magnetoresistive effect sensorsHITACHI LTD·Filed 1999·Granted May 30, 2000·0 cites·10 claims
Showing the top 50 of 51 patent records by PatentIndex Score.
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