Inventor · disambiguated record
Takehiko Hamaguchi
Also filed as: HAMAGUCHI TAKEHIKO · YAGI MICHIO
46 granted patents·8 pending applications·475 citations·filing 1977–2023
98Inventor score
Files withHITACHI GLOBAL STORAGE TECH23HITACHI LTD19WESTERN DIGITAL TECH INC6KONISHIROKU PHOTO IND2HITACHI GLOBAL STORAGE TECH NL1
Top patents by PatentIndex Score
54 records- 0196US7443625B2Magnetic disk driveHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 28, 2008·29 cites·10 claims
- 0296US4545661AFolding camera with movable member mounting an objective lens and reflex mirrorKONISHIROKU PHOTO IND·Filed 1983·Granted Oct 8, 1985·81 cites·8 claims
- 0393US7525765B2Thermal assist head sliderHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Apr 28, 2009·16 cites·13 claims
- 0491US11990154B1Seek time to the beginning position of data on tape mediaWESTERN DIGITAL TECH INC·Filed 2023·Granted May 21, 2024·3 cites·21 claims
- 0591US6657805B2Method of controlling read write operation of a magnetic disk apparatusHITACHI LTD·Filed 2001·Granted Dec 2, 2003·27 cites·7 claims
- 0690US7289284B2Stray field detector, magnetic disk drive, and method of head escapingHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Oct 30, 2007·11 cites·23 claims
- 0790US6909566B1Magnetic recording/reproducing deviceHITACHI GLOBAL STORAGE TECH·Filed 2000·Granted Jun 21, 2005·30 cites·3 claims
- 0889US10607645B1Data storage device generating PES RRO and data sector squeeze RRO for a plurality of zonesWESTERN DIGITAL TECH INC·Filed 2019·Granted Mar 31, 2020·8 cites·20 claims
- 0989US7221530B2Magnetic head with high reliability of the data protection, magnetic disk apparatus including the magnetic head and the method of recording information on the magnetic disk apparatus without miserasing the previously recorded dataHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted May 22, 2007·8 cites·3 claims
- 1087US10699745B1Data storage device defining track trajectory to reduce AC track squeezeWESTERN DIGITAL TECH INC·Filed 2019·Granted Jun 30, 2020·6 cites·9 claims
- 1187US6683823B2Method for reproducing information on a recording mediumHITACHI LTD·Filed 2002·Granted Jan 27, 2004·22 cites·3 claims
- 1285US7545595B2Magnetic disk apparatus having an adjustable mechanism to compensate write or heat element for off-tracking position with yaw angleHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jun 9, 2009·5 cites·1 claims
- 1385US7365933B2Servo information recording method, magnetic recording media, and magnetic disk apparatusHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Apr 29, 2008·7 cites·16 claims
- 1485US7027248B2Magnetic disk apparatus having an adjustable mechanism to compensate write or heat element for off-tracking position with yaw angleHITACHI LTD·Filed 2003·Granted Apr 11, 2006·16 cites·21 claims
- 1584US7518814B2Magnetic head tester and method of manufacturing magnetic disk driveHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Apr 14, 2009·6 cites·18 claims
- 1684US6760172B1Magnetic disk driveHITACHI LTD·Filed 2000·Granted Jul 6, 2004·18 cites·14 claims
- 1783US7436611B2Method of servo writing for magnetic recording system, magnetic recording systemHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Oct 14, 2008·4 cites·23 claims
- 1883US7092181B2Magnetic recording apparatusHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Aug 15, 2006·4 cites·3 claims
- 1982US7075743B2Method of servo writing for magnetic recording system, magnetic recording systemHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Jul 11, 2006·12 cites·25 claims
- 2080US6404576B1Method and system for compensation of nonlinearity or fluctuation of head-position signalHITACHI LTD·Filed 2000·Granted Jun 11, 2002·11 cites·4 claims
- 2176US7724490B2Magnetic disk degaussing device and degaussing methodHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted May 25, 2010·3 cites·18 claims
- 2276US6940690B2Magnetic head with high reliability of the data protection, magnetic disk apparatus including the magnetic head and the method of recording information on the magnetic disk apparatus without miserasing the previously recorded dataHITACHI GLOBAL STORAGE TECH·Filed 2001·Granted Sep 6, 2005·9 cites·14 claims
- 2375US6473254B1Method and system for compensation of nonlinearity or fluctuation of head-position signalHITACHI LTD·Filed 2000·Granted Oct 29, 2002·8 cites·13 claims
- 2472US7031086B2Magnetic recording apparatus, magnetic recording medium and magnetic recording methodHITACHI LTD·Filed 2003·Granted Apr 18, 2006·8 cites·8 claims
- 2571US6717760B2Magnetic disk driveHITACHI GLOBAL STORAGE TECH·Filed 2002·Granted Apr 6, 2004·6 cites·10 claims
- 2671US6327112B1Adjacent track position detectable information storage apparatusHITACHI LTD·Filed 1999·Granted Dec 4, 2001·22 cites·12 claims
- 2771US6310741B1Magnetic disk apparatus with data track reassigning functionHITACHI LTD·Filed 1999·Granted Oct 30, 2001·19 cites·13 claims
- 2869US7068462B2Magnetic recording apparatusHITACHI LTD·Filed 2002·Granted Jun 27, 2006·6 cites·9 claims
- 2967US6906889B2Magnetic disk driveHITACHI LTD·Filed 2002·Granted Jun 14, 2005·5 cites·3 claims
- 3065US6515817B1Magnetic disk driveHITACHI LTD·Filed 1999·Granted Feb 4, 2003·15 cites·9 claims
- 3164US7839590B2Method of servo writing for magnetic recording system, magnetic recording systemHITACHI GLOBAL STORAGE TECH·Filed 2008·Granted Nov 23, 2010·0 cites·4 claims
- 3264US6879460B2Magnetic recording disk driveHITACHI GLOBAL STORAGE TECH·Filed 2003·Granted Apr 12, 2005·4 cites·4 claims
- 3362US6130797AMagnetic recorder and magnetooptical recorderHITACHI LTD·Filed 1995·Granted Oct 10, 2000·16 cites·17 claims
- 3460US11049518B2Data storage device defining track trajectory to reduce AC track squeezeWESTERN DIGITAL TECH INC·Filed 2020·Granted Jun 29, 2021·0 cites·20 claims
- 3559US12106772B2Methods for increasing storage capacity and improving performance in dual-reel removable tape devices and fixed tape devicesWESTERN DIGITAL TECH INC·Filed 2023·Granted Oct 1, 2024·0 cites·19 claims
- 3657US12249350B2Methods for improving track density in dual-reel removable tape devices and fixed tape devicesWESTERN DIGITAL TECH INC·Filed 2023·Granted Mar 11, 2025·0 cites·20 claims
- 3757US8049986B2Control method for magnetic disk device, magnetic disk device, and magnetic diskHITACHI GLOBAL STORAGE TECH NL·Filed 2009·Granted Nov 1, 2011·0 cites·20 claims
- 3856US6822818B2Magnetic hard disk driveHITACHI LTD·Filed 2001·Granted Nov 23, 2004·2 cites·20 claims
- 3956US2008186629A1Method of producing a magnetic disk device with servo data recorded on magnetic disk, head amplifier for magnetic disk device and disk deviceHITACHI GLOBAL STORAGE TECH·Filed 2008·Application pending·0 cites
- 4052US7184236B2Magnetic hard disk driveHITACHI GLOBAL STORAGE TECH·Filed 2004·Granted Feb 27, 2007·1 cites·2 claims
- 4152US7057838B2Magnetic 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
- 4251US7486485B2Perpendicular hard disk drive resistive against external magnetic fieldHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Feb 3, 2009·0 cites·20 claims
- 4349US6657804B1Magnetic recording disk driveHITACHI LTD·Filed 1999·Granted Dec 2, 2003·7 cites·6 claims
- 4449US2007247741A1Method of servo pattern writing on recording surface and data storage deviceHITACHI GLOBAL STORAGE TECH·Filed 2007·Application pending·0 cites
- 4548US5786952AMagnetic digital storage method and system wherein magnetic transition points in adjacent recorded tracks are out of phase with each otherHITACHI LTD·Filed 1995·Granted Jul 28, 1998·8 cites·10 claims
- 4648US2008192379A1Manufacturing method for magnetic disk driveKURITA MASAYUKI·Filed 2008·Application pending·0 cites
- 4748US2006262453A1Magnetic recording head and magnetic disk storage apparatus mounting the magnetic headHITACHI GLOBAL STORAGE TECH·Filed 2006·Application pending·0 cites
- 4846US2006121317A1Magnetic recording medium, method of manufacturing the magnetic recording medium and a magnetic disk drive using the magnetic recording mediumHITACHI GLOBAL STORAGE TECH·Filed 2005·Application pending·0 cites
- 4945US6560168B1Information recording/reproducing deviceHITACHI LTD·Filed 1998·Granted May 6, 2003·6 cites·28 claims
- 5044US2004080856A1Magnetic head with high reliability of the data protection, magnetic disk apparatus including the magnetic head and the method of recording information on the magnetic disk apparatus without miserasing the previously recorded dataHITACHI LTD·Filed 2003·Application pending·0 cites
Showing the top 50 of 54 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →