Inventor · disambiguated record
Toshiaki Okuyama
Also filed as: HORI TAKAMASA · KUBOTA YUZURU · OKUYAMA TOSHIAKI
56 granted patents·1,804 citations·filing 1974–2007
99Inventor score
Top patents by PatentIndex Score
56 records- 0198US4240020AControl system for suppressing torque ripple in synchronous motorHITACHI LTD·Filed 1978·Granted Dec 16, 1980·80 cites·6 claims
- 0297US5355749AControl apparatus and control method for motor drive vehicleHITACHI LTD·Filed 1992·Granted Oct 18, 1994·214 cites·13 claims
- 0396US4328454AApparatus for controlling ac motorHITACHI LTD·Filed 1980·Granted May 4, 1982·83 cites·3 claims
- 0495US6229719B1Method of inverter control and apparatus of the sameHITACHI LTD·Filed 2000·Granted May 8, 2001·67 cites·7 claims
- 0595US4503377AVariable speed rotary electric machineHITACHI LTD·Filed 1984·Granted Mar 5, 1985·86 cites·7 claims
- 0693US4808903AVector control system for induction motorsHITACHI LTD·Filed 1988·Granted Feb 28, 1989·68 cites·62 claims
- 0792US5414339AElectric vehicle control systemHITACHI LTD·Filed 1993·Granted May 9, 1995·139 cites·34 claims
- 0892US4680526AMethod of controlling inverter-driven induction motorHITACHI LTD·Filed 1985·Granted Jul 14, 1987·65 cites·2 claims
- 0988US5475293AMethod for measuring characteristic constants of alternating current motor and controller thereof based on said methodHITACHI LTD·Filed 1993·Granted Dec 12, 1995·60 cites·8 claims
- 1088US4125796AControl apparatus for use in a synchronous machineHITACHI LTD·Filed 1977·Granted Nov 14, 1978·33 cites·5 claims
- 1187US4344025AMotor control systemHITACHI LTD·Filed 1979·Granted Aug 10, 1982·33 cites·9 claims
- 1285US4875539AElectric power steering control systemHITACHI LTD·Filed 1988·Granted Oct 24, 1989·45 cites·20 claims
- 1385US4459534AMethod for controlling induction motor and apparatus thereforHITACHI LTD·Filed 1982·Granted Jul 10, 1984·37 cites·11 claims
- 1484US4276504AControl device for commutatorless motorHITACHI LTD·Filed 1978·Granted Jun 30, 1981·28 cites·7 claims
- 1582US6704212B2PWM inverter with long carrier wave insertionHITACHI LTD·Filed 2002·Granted Mar 9, 2004·44 cites·22 claims
- 1681US4629959AMethod and apparatus for controlling PWM inverterHITACHI LTD·Filed 1985·Granted Dec 16, 1986·40 cites·8 claims
- 1780US4330741AElectric control apparatus of induction motorHITACHI LTD·Filed 1980·Granted May 18, 1982·30 cites·12 claims
- 1880US4277735AControl apparatus for induction motorHITACHI LTD·Filed 1979·Granted Jul 7, 1981·23 cites·5 claims
- 1979US5029288AMethod and apparatus for operating a variable speed power generation systemHITACHI LTD·Filed 1989·Granted Jul 2, 1991·32 cites·5 claims
- 2079US4132931AControl system for a.c. motorsHITACHI LTD·Filed 1977·Granted Jan 2, 1979·29 cites·6 claims
- 2179US4060753AControl system for commutatorless motorHITACHI LTD·Filed 1976·Granted Nov 29, 1977·22 cites·8 claims
- 2278US4088932AControl system for commutatorless motorHITACHI LTD·Filed 1977·Granted May 9, 1978·21 cites·7 claims
- 2377US7545116B2Driver for induction motor and method of driving the sameHITACHI IND EQUIPMENT SYS·Filed 2007·Granted Jun 9, 2009·11 cites·14 claims
- 2476US5016158AParallel multi-inverter system and motor drive system using the sameHITACHI LTD·Filed 1990·Granted May 14, 1991·48 cites·3 claims
- 2575US6556464B2PWM converter systemHITACHI LTD·Filed 2001·Granted Apr 29, 2003·30 cites·11 claims
- 2675US4503375AMethod for controlling induction motor and apparatus thereforHITACHI LTD·Filed 1984·Granted Mar 5, 1985·24 cites·10 claims
- 2775US4206395AHarmonic eliminating apparatusHITACHI LTD·Filed 1978·Granted Jun 3, 1980·19 cites·12 claims
- 2874US6496397B2Inverter deviceHITACHI LTD·Filed 2001·Granted Dec 17, 2002·29 cites·5 claims
- 2973US6556460B2Method for controlling a vehicle provided with an electric power converterHITACHI LTD·Filed 2002·Granted Apr 29, 2003·22 cites·5 claims
- 3072US6741063B2Inverter apparatusHITACHI LTD·Filed 2002·Granted May 25, 2004·16 cites·18 claims
- 3171US6642689B2Control apparatus for power converterHITACHI LTD·Filed 2001·Granted Nov 4, 2003·32 cites·20 claims
- 3271US5808442AMethod of charging a plurality of lithium ion rechargeable batteriesSANYO ELECTRIC CO·Filed 1996·Granted Sep 15, 1998·45 cites·9 claims
- 3371US3949283AControl system for brushless motorHITACHI LTD·Filed 1974·Granted Apr 6, 1976·17 cites·5 claims
- 3470US7869232B2Electric power converter suppressing output voltage variation due to input voltage fluctuationHITACHI LTD·Filed 2007·Granted Jan 11, 2011·7 cites·16 claims
- 3570US4503376AControl method for induction motorsHITACHI LTD·Filed 1983·Granted Mar 5, 1985·19 cites·4 claims
- 3669US6841911B2Machine toolHITACHI LTD·Filed 2002·Granted Jan 11, 2005·15 cites·14 claims
- 3768US6844700B2Inverter apparatusHITACHI LTD·Filed 2003·Granted Jan 18, 2005·14 cites·12 claims
- 3868US6670786B2Apparatus for controlling an induction motorHITACHI LTD·Filed 2001·Granted Dec 30, 2003·13 cites·32 claims
- 3967US7671558B2Induction motor controllerHITACHI IND EQUIPMENT SYS·Filed 2007·Granted Mar 2, 2010·6 cites·13 claims
- 4065US6657412B2Pulse width modulation method, pulse width modulator and power converterHITACHI LTD·Filed 2001·Granted Dec 2, 2003·11 cites·18 claims
- 4165US6611125B2Method for calculating inertia moment and driver for electric motorHITACHI LTD·Filed 2001·Granted Aug 26, 2003·14 cites·14 claims
- 4264US4792742AControl apparatus for an inverter with self-adjustment function of control constantsHITACHI LTD·Filed 1987·Granted Dec 20, 1988·20 cites·6 claims
- 4362US4524310AMethod and apparatus of controlling induction motorsHITACHI LTD·Filed 1983·Granted Jun 18, 1985·14 cites·10 claims
- 4460US6344726B1Method of controlling an induction motorHITACHI LTD·Filed 2000·Granted Feb 5, 2002·9 cites·32 claims
- 4559US6300741B1Speed controlling method for induction motorHITACHI LTD·Filed 2000·Granted Oct 9, 2001·10 cites·20 claims
- 4659US5033565AMotor-driven power steering apparatusHITACHI LTD·Filed 1989·Granted Jul 23, 1991·18 cites·8 claims
- 4758US4295084AControl apparatus of synchronous motor having thyristor converterHITACHI LTD·Filed 1979·Granted Oct 13, 1981·11 cites·8 claims
- 4856US4625272AConverter control apparatus and methodHITACHI LTD·Filed 1983·Granted Nov 25, 1986·11 cites·10 claims
- 4950US4562397ASquirrel-cage induction motorHITACHI LTD·Filed 1984·Granted Dec 31, 1985·12 cites·9 claims
- 5046US7332888B2Driving apparatus for a motorHITACHI LTD·Filed 2006·Granted Feb 19, 2008·2 cites·15 claims
Showing the top 50 of 56 patent records by PatentIndex Score.
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