Inventor
IWASAKA TATSUO
11 patents
Patents
11 patentsUS4044860AAug 30, 1977
Elevator traffic demand detector
HITACHI LTD61 citations96
US4112419ASep 5, 1978
Apparatus for detecting the number of objects
HITACHI LTD53 citations92
US4345670AAug 24, 1982
Elevator control system
HITACHI LTD19 citations82
US4081059AMar 28, 1978
Elevator control system
HITACHI LTD23 citations82
US4030571AJun 21, 1977
Elevator control system
HITACHI LTD24 citations82
US4030572AJun 21, 1977
Elevator control apparatus
HITACHI LTD26 citations82
US3973649AAug 10, 1976
Elevator control apparatus
HITACHI LTD32 citations82
US4023135AMay 10, 1977
Apparatus for detecting the number of objects
HITACHI LTD22 citations80
US4043429AAug 23, 1977
Elevator car group control system
HITACHI LTD13 citations74
US3999631ADec 28, 1976
Elevator control system
HITACHI LTD16 citations73
US4064971ADec 27, 1977
Elevator service information apparatus
HITACHI LTD16 citations69