Inventor
MITSUI NOBUO
JP7 patents
Patents
7 patentsUS4870556ASep 26, 1989
Method and apparatus for controlling power converter
HITACHI LTD28 citations92
US4833586AMay 23, 1989
PWM control for power converter system utilizing pulse dropping at minimum pulse widths
HITACHI LTD31 citations92
US4094385AJun 13, 1978
Levelling apparatus for AC elevator
HITACHI LTD27 citations79
US4056759ANov 1, 1977
Driving system for moving paths or escalators
HITACHI LTD22 citations77
US4779709AOct 25, 1988
Apparatus for controlling AC elevators
HITACHI LTD8 citations73
US4441584AApr 10, 1984
AC Elevator control system
HITACHI LTD13 citations72
US4101819AJul 18, 1978
Three phase controlling system
HITACHI LTD13 citations72