Inventor
ISHIDA SEIJI
JP46 patents
⚠️ This page may combine multiple inventors who share the name “ISHIDA SEIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
15 patentsUS6642689B2Nov 4, 2003
Control apparatus for power converter
HITACHI LTD32 citations93
US6556460B2Apr 29, 2003
Method for controlling a vehicle provided with an electric power converter
HITACHI LTD22 citations93
US5574352ANov 12, 1996
Frequency control method for inverter and apparatus therefor
HITACHI LTD23 citations93
US7570085B2Aug 4, 2009
Gate driver circuit for switching device
HITACHI LTD37 citations92
US6704212B2Mar 9, 2004
PWM inverter with long carrier wave insertion
HITACHI LTD44 citations92
US6556464B2Apr 29, 2003
PWM converter system
HITACHI LTD30 citations92
US6496397B2Dec 17, 2002
Inverter device
HITACHI LTD29 citations92
US6147470ANov 14, 2000
Device for controlling induction motor and method of controlling the same
HITACHI LTD22 citations92
US5631819AMay 20, 1997
Power converter
HITACHI LTD41 citations92
US6058036AMay 2, 2000
Inverter apparatus having operation specifications determined by type of I/O block which is connected to basic control unit
HITACHI LTD27 citations89
US6611124B2Aug 26, 2003
Control apparatus of induction motor
HITACHI LTD14 citations84
US6657412B2Dec 2, 2003
Pulse width modulation method, pulse width modulator and power converter
HITACHI LTD11 citations74
US5300872AApr 5, 1994
Method and apparatus for control of inverter
HITACHI LTD11 citations72
US7920395B2Apr 5, 2011
Pulse width modulation method for a power converter
HITACHI LTD3 citations61
US7433403B2Oct 7, 2008
Pulse width modulation method for a power converter
HITACHI LTD2 citations61
HITACHI CONSTRUCTION MACH CO
15 patentsUS10450723B2Oct 22, 2019
Hybrid construction machinery
HITACHI CONSTRUCTION MACH CO14 citations86
US11053661B2Jul 6, 2021
Work machine
HITACHI CONSTRUCTION MACH CO2 citations73
US11198352B2Dec 14, 2021
Electricity storage device controller, electric system and construction machine
HITACHI CONSTRUCTION MACH CO2 citations71
US12224650B2Feb 11, 2025
Drive system having an induction generator with a main winding and auxiliary winding
HITACHI CONSTRUCTION MACH CO0 citations62
US11149409B2Oct 19, 2021
Construction machine
HITACHI CONSTRUCTION MACH CO1 citations61
US11964569B2Apr 23, 2024
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations52
US10150465B2Dec 11, 2018
Hybrid construction machine
HITACHI CONSTRUCTION MACH CO1 citations52
US10060095B2Aug 28, 2018
Hybrid work machine
HITACHI CONSTRUCTION MACH CO1 citations50
US12573972B2Mar 10, 2026
Electric power generation system
HITACHI CONSTRUCTION MACH CO0 citations49
US12319155B2Jun 3, 2025
Drive system for dump truck
HITACHI CONSTRUCTION MACH CO0 citations49
US12191789B2Jan 7, 2025
Drive system
HITACHI CONSTRUCTION MACH CO0 citations49
US12460380B2Nov 4, 2025
Electric work machine
HITACHI CONSTRUCTION MACH CO0 citations46
US11220803B2Jan 11, 2022
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations44
US9617715B2Apr 11, 2017
Construction machine
HITACHI CONSTRUCTION MACH CO0 citations42
US10047501B2Aug 14, 2018
Control device of construction machine
HITACHI CONSTRUCTION MACH CO0 citations41