Inventor · disambiguated record
Ryoso Masaki
Also filed as: MASAKI RYOSO
84 granted patents·16 pending applications·4,127 citations·filing 1989–2014
99Inventor score
Top patents by PatentIndex Score
100 records- 0199US6053833ATransmission, and vehicle and bicycle using the sameHITACHI LTD·Filed 1999·Granted Apr 25, 2000·258 cites·26 claims
- 0298US5549172AElectric vehicle drive system and drive methodHITACHI LTD·Filed 1994·Granted Aug 27, 1996·201 cites·24 claims
- 0397US5355749AControl apparatus and control method for motor drive vehicleHITACHI LTD·Filed 1992·Granted Oct 18, 1994·214 cites·13 claims
- 0496US8373326B2Axial gap motor, compressor, motor system, and power generatorHITACHI METALS LTD·Filed 2010·Granted Feb 12, 2013·29 cites·14 claims
- 0596US6788024B2Position-sensorless motor control method and apparatusHITACHI LTD·Filed 2003·Granted Sep 7, 2004·90 cites·15 claims
- 0696US5239490ADevice for detecting rotation of rotary shaft and rotation controlling apparatus using the sameHITACHI LTD·Filed 1990·Granted Aug 24, 1993·126 cites·18 claims
- 0795US6555988B2Motor control deviceHITACHI LTD·Filed 2000·Granted Apr 29, 2003·67 cites·13 claims
- 0895US6328670B1Power transmission apparatus for an automobileHITACHI LTD·Filed 2000·Granted Dec 11, 2001·70 cites·10 claims
- 0995US6281656B1Synchronous motor control device electric motor vehicle control device and method of controlling synchronous motorHITACHI LTD·Filed 1999·Granted Aug 28, 2001·121 cites·8 claims
- 1094US6692405B2Power transmission apparatus for an automobileHITACHI LTD·Filed 2002·Granted Feb 17, 2004·60 cites·2 claims
- 1194US6258006B1Transmission, vehicle, hybrid vehicle, and control unit thereforHITACHI LTD·Filed 2000·Granted Jul 10, 2001·86 cites·13 claims
- 1293US6501243B1Synchronous motor-control apparatus and vehicle using the control apparatusHITACHI LTD·Filed 2000·Granted Dec 31, 2002·105 cites·8 claims
- 1393US5481168AElectric vehicle torque controllerHITACHI LTD·Filed 1994·Granted Jan 2, 1996·67 cites·31 claims
- 1493US5481460AController for electric vehicleHITACHI LTD·Filed 1991·Granted Jan 2, 1996·109 cites·15 claims
- 1592US6470983B1Hybrid vehicleHITACHI LTD·Filed 2000·Granted Oct 29, 2002·97 cites·1 claims
- 1692US5414339AElectric vehicle control systemHITACHI LTD·Filed 1993·Granted May 9, 1995·139 cites·34 claims
- 1791US7649298B2Claw teeth type electric rotary machine and manufacturing method for statorsHITACHI IND EQUIPMENT SYS·Filed 2007·Granted Jan 19, 2010·21 cites·13 claims
- 1890US6700343B2Motor controllerHITACHI LTD·Filed 2002·Granted Mar 2, 2004·38 cites·5 claims
- 1990US6557656B2Driving system and vehicleHITACHI LTD·Filed 2001·Granted May 6, 2003·61 cites·12 claims
- 2090US5914582APermanent magnet synchronous motor controller and electric vehicle controllerHITACHI LTD·Filed 1998·Granted Jun 22, 1999·136 cites·14 claims
- 2190US5357181AFailure detection method for electric vehicles and fail-safe control method using this methodHITACHI LTD·Filed 1993·Granted Oct 18, 1994·123 cites·24 claims
- 2289US6844697B2Motor controllerHITACHI LTD·Filed 2002·Granted Jan 18, 2005·34 cites·19 claims
- 2389US6456030B1Synchronous motor control device, electric motor vehicle control device and method of controlling synchronous motorHITACHI LTD·Filed 2001·Granted Sep 24, 2002·49 cites·49 claims
- 2488US7714475B2Multiple phase claw pole type motorHITACHI IND EQUIPMENT SYS·Filed 2006·Granted May 11, 2010·13 cites·12 claims
- 2586US7626301B2Electric rotating machine having permanent magnets and method of manufacturing teeth portions of the stator iron coreJAPAN SERVO·Filed 2005·Granted Dec 1, 2009·12 cites·7 claims
- 2685US6507127B1Hybrid vehicleHITACHI LTD·Filed 2000·Granted Jan 14, 2003·65 cites·4 claims
- 2785US6248036B1Transmission and vehicle and bicycle using the sameHITACHI LTD·Filed 2000·Granted Jun 19, 2001·34 cites·3 claims
- 2885US5726551ABattery charging device having time shared charging cycleHITACHI LTD·Filed 1996·Granted Mar 10, 1998·109 cites·18 claims
- 2985US5345155AControl system for electric vehicleHITACHI LTD·Filed 1992·Granted Sep 6, 1994·100 cites·7 claims
- 3083US6198256B1Control apparatus for a synchronous generator system and a hybrid-type electric vehicle using itHITACHI LTD·Filed 1999·Granted Mar 6, 2001·58 cites·16 claims
- 3182US8680736B2Armature core, motor using same, and axial gap electrical rotating machine using sameWANG ZHUONAN·Filed 2009·Granted Mar 25, 2014·11 cites·12 claims
- 3282US6696812B2Control apparatus for electric motorHITACHI LTD·Filed 2001·Granted Feb 24, 2004·54 cites·27 claims
- 3382US5650700AElectric vehicle torque controllerHITACHI LTD·Filed 1995·Granted Jul 22, 1997·43 cites·4 claims
- 3482US5583406AControl method and system for regeneration braking of an electric vehicleHITACHI LTD·Filed 1994·Granted Dec 10, 1996·89 cites·15 claims
- 3581US6426608B2Automobile and power supply system thereforHITACHI LTD·Filed 2001·Granted Jul 30, 2002·51 cites·10 claims
- 3680US7906881B2MotorHITACHI LTD·Filed 2006·Granted Mar 15, 2011·10 cites·17 claims
- 3780US6318486B2Hybrid vehicleHITACHI LTD·Filed 2001·Granted Nov 20, 2001·32 cites·1 claims
- 3880US6142907APower transmission apparatus for an automobileHITACHI LTD·Filed 1999·Granted Nov 7, 2000·42 cites·2 claims
- 3979US6979977B2Power controller for a vehicleHITACHI LTD·Filed 2004·Granted Dec 27, 2005·30 cites·12 claims
- 4079US6926115B2Angle sensor, angle-torque sensor and electric power steering unit using sameHITACHI CABLE·Filed 2003·Granted Aug 9, 2005·18 cites·20 claims
- 4179US6234930B1Transmission and vehicle using sameHITACHI LTD·Filed 1998·Granted May 22, 2001·42 cites·12 claims
- 4279US5309073AElectric vehicle control deviceHITACHI LTD·Filed 1992·Granted May 3, 1994·67 cites·21 claims
- 4378US6806588B2Power controller for a vehicleHITACHI LTD·Filed 2001·Granted Oct 19, 2004·28 cites·9 claims
- 4478US5631819APower converterHITACHI LTD·Filed 1996·Granted May 20, 1997·41 cites·14 claims
- 4577US7714466B2Claw-teeth-type rotating electrical machineHITACHI IND EQUIPMENT SYS·Filed 2007·Granted May 11, 2010·8 cites·7 claims
- 4677US6223842B1Hybrid vehicleHITACHI LTD·Filed 1999·Granted May 1, 2001·44 cites·9 claims
- 4776US7692344B2Polyphase claw pole type motorHITACHI IND EQUIPMENT SYS·Filed 2006·Granted Apr 6, 2010·8 cites·15 claims
- 4876US5467275AControl apparatus for electric vehicleHITACHI LTD·Filed 1993·Granted Nov 14, 1995·51 cites·26 claims
- 4975US8937422B2Magnetic iron core, method for manufacturing the same, axial-gap rotating electrical machine, and static electrical machineENOMOTO YUJI·Filed 2010·Granted Jan 20, 2015·5 cites·12 claims
- 5075US7791244B2Multiphase claw-pole type electric rotary machine, cogging torque adjustment system of the same, generator system, and motor systemHITACHI IND EQUIPMENT SYS·Filed 2007·Granted Sep 7, 2010·7 cites·18 claims
Showing the top 50 of 100 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →