Inventor · disambiguated record
Keijiro Sakai
Also filed as: SAKAI KEIJIRO
19 granted patents·543 citations·filing 1981–2005
96Inventor score
Files withHITACHI LTD19
Top patents by PatentIndex Score
19 records- 0195US6229719B1Method of inverter control and apparatus of the sameHITACHI LTD·Filed 2000·Granted May 8, 2001·67 cites·7 claims
- 0290US4599549AMethod and apparatus for controlling PWM invertersHITACHI LTD·Filed 1985·Granted Jul 8, 1986·62 cites·10 claims
- 0388US5475293AMethod 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
- 0484US4688162ARectifier control apparatus with improved power factorHITACHI LTD·Filed 1986·Granted Aug 18, 1987·53 cites·7 claims
- 0583US4419615AMethod of controlling pulse width modulated inverter for use in induction motor driveHITACHI LTD·Filed 1981·Granted Dec 6, 1983·36 cites·3 claims
- 0682US4480299AMethod of controlling the output voltage of a pulse width modulation inverterHITACHI LTD·Filed 1982·Granted Oct 30, 1984·32 cites·6 claims
- 0781US4437051AMethod and apparatus for controlling induction motorHITACHI LTD·Filed 1982·Granted Mar 13, 1984·32 cites·4 claims
- 0874US6496397B2Inverter deviceHITACHI LTD·Filed 2001·Granted Dec 17, 2002·29 cites·5 claims
- 0972US6741063B2Inverter apparatusHITACHI LTD·Filed 2002·Granted May 25, 2004·16 cites·18 claims
- 1070US4562524AControl apparatus for PWM inverterHITACHI LTD·Filed 1984·Granted Dec 31, 1985·20 cites·5 claims
- 1168US6844700B2Inverter apparatusHITACHI LTD·Filed 2003·Granted Jan 18, 2005·14 cites·12 claims
- 1267US5184057AControl method and device for ac motorHITACHI LTD·Filed 1990·Granted Feb 2, 1993·35 cites·41 claims
- 1366US4420718AControl system for induction motor using inverter for AC power supplyHITACHI LTD·Filed 1981·Granted Dec 13, 1983·17 cites·8 claims
- 1465US6657412B2Pulse width modulation method, pulse width modulator and power converterHITACHI LTD·Filed 2001·Granted Dec 2, 2003·11 cites·18 claims
- 1564US5023538APWM inverter apparatus for controlling rotating magnetic flux in a.c. motorsHITACHI LTD·Filed 1989·Granted Jun 11, 1991·22 cites·15 claims
- 1663US7250696B2Linear motor and X-Y stageHITACHI LTD·Filed 2004·Granted Jul 31, 2007·11 cites·17 claims
- 1760US5053690AControl method of pulse width modulation inverter and pulse width modulation inverter systemHITACHI LTD·Filed 1989·Granted Oct 1, 1991·18 cites·8 claims
- 1859US7777371B2Linear drive apparatus having cores and coils which are positioned on opposite sides of the coresHITACHI LTD·Filed 2005·Granted Aug 17, 2010·2 cites·4 claims
- 1954US7004694B2Linear drive apparatusHITACHI LTD·Filed 2003·Granted Feb 28, 2006·6 cites·10 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →