Inventor · disambiguated record
Katsutoshi Nii
Also filed as: NII KATSUTOSHI · TAKAGI NOBUHO
37 granted patents·5 pending applications·794 citations·filing 1978–2007
98Inventor score
Top patents by PatentIndex Score
42 records- 0192US6477133B1Disk drive with unbalance correcting mechanismHITACHI LTD·Filed 2000·Granted Nov 5, 2002·41 cites·7 claims
- 0291US5834870AOil impregnated porous bearing units and motors provided with sameHITACHI LTD·Filed 1997·Granted Nov 10, 1998·58 cites·26 claims
- 0390US6771460B2Spindle motor and magnetic disc device using thereof having radial and thrust bearingsHITACHI LTD·Filed 2002·Granted Aug 3, 2004·23 cites·12 claims
- 0489US6756715B2Spindle motorHITACHI POWDERED METALS·Filed 2003·Granted Jun 29, 2004·31 cites·11 claims
- 0589US4508396AMethod of producing bearing componentHITACHI LTD·Filed 1982·Granted Apr 2, 1985·42 cites·6 claims
- 0686US6574186B2Assembly method of motor using magnetic lubrication fluidHITACHI LTD·Filed 2000·Granted Jun 3, 2003·24 cites·4 claims
- 0786US4938611ABearing apparatusHITACHI LTD·Filed 1989·Granted Jul 3, 1990·43 cites·20 claims
- 0883US6469866B1Spindle motor and magnetic disc device with hydrodynamic bearingHITACHI LTD·Filed 2000·Granted Oct 22, 2002·16 cites·17 claims
- 0982US6851859B2Bearing unit, production method therefor and spindle motorHITACHI POWDERED METALS·Filed 2003·Granted Feb 8, 2005·18 cites·12 claims
- 1081US6356408B1Magnetic disk apparatus, including spindle motor having air flow passage in hub for pressure balanceHITACHI LTD·Filed 1999·Granted Mar 12, 2002·30 cites·3 claims
- 1180US5325006ASealed magnetic fluid bearing for polygon mirror drive motorHITACHI LTD·Filed 1991·Granted Jun 28, 1994·42 cites·9 claims
- 1276US5574322AMotor, a printer having such a motor and a disk drive system having such a motorHITACHI LTD·Filed 1993·Granted Nov 12, 1996·46 cites·20 claims
- 1376US5417507AVertical motor, method of manufacturing same, polygon mirror motor using said motor, and bearing device for use in said motorHITACHI LTD·Filed 1993·Granted May 23, 1995·32 cites·26 claims
- 1474US6846109B2Sintered bearing and production method thereforMINEBEA CO LTD·Filed 2003·Granted Jan 25, 2005·12 cites·8 claims
- 1573US5645355ABearing unitHITACHI LTD·Filed 1996·Granted Jul 8, 1997·27 cites·6 claims
- 1672US6369981B2Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unitHITACHI LTD·Filed 2001·Granted Apr 9, 2002·13 cites·14 claims
- 1770US5541462ARotary body bearing apparatus, motor and polygon mirror motorHITACHI LTD·Filed 1994·Granted Jul 30, 1996·25 cites·17 claims
- 1869US6680814B2Spindle motor and magnetic disc device with hydrodynamic bearingsHITACHI LTD·Filed 2002·Granted Jan 20, 2004·8 cites·10 claims
- 1969US5493161ASealed magnetic fluid bearing for polygon mirror drive motorHITACHI LTD·Filed 1994·Granted Feb 20, 1996·23 cites·13 claims
- 2069US5108198AMagnetic fluid bearing apparatus and motor having magnetic fluid bearing apparatusHITACHI LTD·Filed 1990·Granted Apr 28, 1992·27 cites·13 claims
- 2168US7218023B2Spindle motorMINEBEA CO LTD·Filed 2002·Granted May 15, 2007·8 cites·12 claims
- 2268US5810481AOil retaining bearing unit and motor having oil retaining bearing unitHITACHI LTD·Filed 1997·Granted Sep 22, 1998·23 cites·25 claims
- 2367US4433432AX-Ray tube apparatusHITACHI LTD·Filed 1981·Granted Feb 21, 1984·14 cites·19 claims
- 2466US5035519ASubmersible thrust bearing apparatusHITACHI LTD·Filed 1990·Granted Jul 30, 1991·25 cites·8 claims
- 2562US6243230B1Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unitHITACHI LTD·Filed 1999·Granted Jun 5, 2001·19 cites·4 claims
- 2660US7251891B2Production method for sintered bearing member, fluid dynamic pressure bearing device, and spindle motorMINEBEA CO LTD·Filed 2005·Granted Aug 7, 2007·2 cites·6 claims
- 2759US7559697B2Dynamic bearing unitHITACHI POWDERED METALS·Filed 2006·Granted Jul 14, 2009·1 cites·4 claims
- 2858US6256288B1Disk apparatus and motor thereforHITACHI LTD·Filed 1998·Granted Jul 3, 2001·13 cites·11 claims
- 2958US5821655AMagnetic fluid bearing unit structure and motor having the sameHITACHI LTD·Filed 1997·Granted Oct 13, 1998·24 cites·16 claims
- 3057US4746268AEnd face mechanical shaft seal for use in hydraulic machines and seal ring assembly for use in the shaft sealHITACHI LTD·Filed 1987·Granted May 24, 1988·20 cites·15 claims
- 3155US4529209AHydraulic machine shaft seal with centrifugal removal of sand and soil particlesHITACHI LTD·Filed 1983·Granted Jul 16, 1985·15 cites·11 claims
- 3253US5469008AMotor with a bearing lubricated by magnetic fluidHITACHI LTD·Filed 1993·Granted Nov 21, 1995·24 cites·9 claims
- 3350USRE35718EBearing apparatusHITACHI LTD·Filed 1995·Granted Jan 27, 1998·13 cites·22 claims
- 3449US2006088234A1Fluid dynamic pressure bearing and production method for the sameHITACHI POWDERED METALS·Filed 2005·Application pending·0 cites
- 3546US6369980B2Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unitHITACHI LTD·Filed 2001·Granted Apr 9, 2002·1 cites·6 claims
- 3645US2006051003A1Fluid dynamic pressure bearingHITACHI POWDERED METALS·Filed 2005·Application pending·0 cites
- 3743US2008010832A1Production method for sintered fluid dynamic pressure bearingHITACHI POWDERED METALS·Filed 2007·Application pending·0 cites
- 3843US2007212248A1Production method for fluid dynamic pressure sintered bearingHITACHI POWDERED METALS·Filed 2007·Application pending·0 cites
- 3943US2002071204A1Magnetic disk apparatusHITACHI LTD·Filed 2002·Application pending·0 cites
- 4042US6951423B2Sintered bearing and production method thereforHITACHI POWDERED METALS·Filed 2003·Granted Oct 4, 2005·0 cites·5 claims
- 4136US5297927AVertical shaft type pumpHITACHI LTD·Filed 1993·Granted Mar 29, 1994·6 cites·11 claims
- 4234US4180273ASealing device for rotor shaft of fluid machineHITACHI LTD·Filed 1978·Granted Dec 25, 1979·5 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →