Inventor
TOBITA TOSHIMITSU
JP12 patents
Patents
12 patentsUS5892190AApr 6, 1999
Method and system of controlling elevators and method and apparatus of inputting requests to the control system
HITACHI LTD49 citations96
US5307903AMay 3, 1994
Method and system of controlling elevators and method and apparatus of inputting requests to the control system
HITACHI LTD54 citations96
US5042620AAug 27, 1991
Elevator control system
HITACHI LTD143 citations96
US5010472AApr 23, 1991
Customer participatory elevator control system
HITACHI LTD56 citations95
US4947965AAug 14, 1990
Group-control method and apparatus for an elevator system with plural cages
HITACHI LTD68 citations95
US4989694AFeb 5, 1991
Elevator group supervisory system
HITACHI LTD56 citations94
US4870556ASep 26, 1989
Method and apparatus for controlling power converter
HITACHI LTD28 citations92
US5283399AFeb 1, 1994
Group control of elevator system improvement measures
HITACHI LTD43 citations91
US4872532AOct 10, 1989
Signal transmission method and system in elevator equipment
HITACHI LTD29 citations91
US4829416AMay 9, 1989
Apparatus for controlling power transducers of the pulse width modulation (PWM) control type
HITACHI LTD21 citations82
US5239141AAug 24, 1993
Group management control method and apparatus for an elevator system
HITACHI LTD20 citations81
US5409085AApr 25, 1995
Group control elevator system for automatically adjusting elevator operation based on a evaluation function
HITACHI LTD19 citations73