Inventor · disambiguated record
Hajime Aoi
Also filed as: AOI HAJIME
32 granted patents·2 pending applications·639 citations·filing 1979–2012
97Inventor score
Files withHITACHI LTD28FUJI ELECTRIC CO LTD1HITACHI GLOBAL STORAGE TECH1KITAKAMI OSAMU1SAYAMA JUNICHI1
Top patents by PatentIndex Score
34 records- 0194US5193034AMagnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic diskHITACHI LTD·Filed 1990·Granted Mar 9, 1993·75 cites·20 claims
- 0293US5568331AMethod of head positioning and magnetic recording disk drive using the sameHITACHI LTD·Filed 1990·Granted Oct 22, 1996·67 cites·22 claims
- 0392US5416331ASurface atom fabrication method and apparatusHITACHI LTD·Filed 1992·Granted May 16, 1995·69 cites·36 claims
- 0484US5287228APeak detection method and apparatus thereforHITACHI LTD·Filed 1991·Granted Feb 15, 1994·36 cites·35 claims
- 0582US5402428AArray disk subsystemHITACHI LTD·Filed 1990·Granted Mar 28, 1995·79 cites·23 claims
- 0681US4907100AReadout circuit in magnetic recording deviceHITACHI LTD·Filed 1988·Granted Mar 6, 1990·24 cites·13 claims
- 0778US6243824B1Array disk subsystemHITACHI LTD·Filed 1994·Granted Jun 5, 2001·62 cites·4 claims
- 0877US4774601ARead channel for magnetic recordingHITACHI LTD·Filed 1986·Granted Sep 27, 1988·21 cites·7 claims
- 0974US8323808B2Perpendicular magnetic recording mediumKITAKAMI OSAMU·Filed 2005·Granted Dec 4, 2012·3 cites·7 claims
- 1074US5689494ASurface atom fabrication method and apparatusHITACHI LTD·Filed 1995·Granted Nov 18, 1997·22 cites·20 claims
- 1174US5132854AHigh speed seek sector servo magnetic disk drive unitHITACHI LTD·Filed 1989·Granted Jul 21, 1992·19 cites·9 claims
- 1274US4249219ACurrent drive circuit for an induction coilHITACHI LTD·Filed 1979·Granted Feb 3, 1981·15 cites·15 claims
- 1367US5109311AMagnetic disk device and method of recording/retrieving informationHITACHI LTD·Filed 1991·Granted Apr 28, 1992·17 cites·38 claims
- 1466US8691402B2Perpendicular magnetic recording mediumFUJI ELECTRIC CO LTD·Filed 2012·Granted Apr 8, 2014·1 cites·15 claims
- 1560US7993762B2Magnetic thin film and method of manufacturing the same, and various application devices using the sameUNIV TOHOKU·Filed 2009·Granted Aug 9, 2011·1 cites·12 claims
- 1659US5572699AVariable length data in a parallel disk arrayHITACHI LTD·Filed 1993·Granted Nov 5, 1996·33 cites·30 claims
- 1758US5337198ADigital magnetic writing and reading apparatusHITACHI LTD·Filed 1992·Granted Aug 9, 1994·12 cites·15 claims
- 1858US5008761AReadout circuit in magnetic recording deviceHITACHI LTD·Filed 1990·Granted Apr 16, 1991·10 cites·10 claims
- 1956US4792497AMagnetic recording media for longitudinal recordingHITACHI LTD·Filed 1988·Granted Dec 20, 1988·10 cites·8 claims
- 2053US5572379AMagnetic recording drive having arrangements for average useful life of magnetorestive effects sensorsHITACHI LTD·Filed 1994·Granted Nov 5, 1996·6 cites·8 claims
- 2152US4644424AEqualizer used for magnetic storage deviceHITACHI LTD·Filed 1984·Granted Feb 17, 1987·7 cites·14 claims
- 2251US5740142AMethod and apparatus for fast transfer of data in recording and reproducing systemHITACHI LTD·Filed 1996·Granted Apr 14, 1998·9 cites·20 claims
- 2349US4777553AMagnetic headHITACHI LTD·Filed 1986·Granted Oct 11, 1988·7 cites·11 claims
- 2449US4755891ACircuit for processing waveform of reproduced signal in magnetic reproducing apparatusHITACHI LTD·Filed 1986·Granted Jul 5, 1988·7 cites·1 claims
- 2548US8076012B2Magnetic thin film and method for forming the film, and magnetic thin film-applied deviceSHIMATSU TAKEHITO·Filed 2009·Granted Dec 13, 2011·0 cites·19 claims
- 2647US4851939AActuator driving apparatus and magnetic disk drive system with a smaller number of high power amplifiers than actuatorsHITACHI LTD·Filed 1987·Granted Jul 25, 1989·7 cites·10 claims
- 2742US4823208AMulti slice level signal circuitHITACHI LTD·Filed 1987·Granted Apr 18, 1989·5 cites·17 claims
- 2840US5325364AMethod for error correction and circuit for realizing sameHITACHI LTD·Filed 1989·Granted Jun 28, 1994·9 cites·11 claims
- 2940US2004109253A1Magnetic recording disk drive and method for ensuring magnetic recording function thereofHITACHI GLOBAL STORAGE TECH·Filed 2003·Application pending·0 cites
- 3037US4651236AWaveform equalizing circuitHITACHI LTD·Filed 1986·Granted Mar 17, 1987·4 cites·16 claims
- 3136US2011020669A1Magnetic recording mediumSAYAMA JUNICHI·Filed 2010·Application pending·0 cites
- 3234US5671107ALarge capacity magnetic disc apparatus with a particular relationship between pole thickness, saturated flux density, and recording wavelengthHITACHI LTD·Filed 1995·Granted Sep 23, 1997·2 cites·15 claims
- 3331US6069762AMagnetic recording drive having arrangement for averaging useful life of magnetoresistive effect sensorsHITACHI LTD·Filed 1999·Granted May 30, 2000·0 cites·10 claims
- 3431US6014275AMagnetic recording driveHITACHI LTD·Filed 1996·Granted Jan 11, 2000·0 cites·6 claims
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