Inventor
NAKAGAWA HIROTO
JP29 patents
⚠️ This page may combine multiple inventors who share the name “NAKAGAWA HIROTO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
19 patentsUS5026256AJun 25, 1991
Variable speed pumping-up system
HITACHI LTD102 citations95
US4754156AJun 28, 1988
Control apparatus for variable-speed hydraulic power generating system
HITACHI LTD66 citations95
US4812729AMar 14, 1989
Protecting apparatus for secondary excitation type variable speed AC generator/motor
HITACHI LTD64 citations94
US4694189ASep 15, 1987
Control system for variable speed hydraulic turbine generator apparatus
HITACHI LTD85 citations94
US5561358AOct 1, 1996
Variable speed pumping-up generator
HITACHI LTD22 citations92
US4920277AApr 24, 1990
Control system for a variable speed hydro-power plant apparatus
HITACHI LTD43 citations92
US4823018AApr 18, 1989
Control system for variable speed water-wheel generator apparatus
HITACHI LTD37 citations92
US4952852AAug 28, 1990
Power system and synchronizing breakers for a variable speed generator motor system
HITACHI LTD48 citations91
US4812730AMar 14, 1989
Variable-speed generator/motor system
HITACHI LTD28 citations89
US6336322B1Jan 8, 2002
Method of controlling a pump turbine
HITACHI LTD16 citations80
US5099409AMar 24, 1992
Semiconductor electric power conversion system enabling fault and/or overtemperature protection
HITACHI LTD20 citations80
US4870339ASep 26, 1989
Variable-speed power generating system
HITACHI LTD22 citations80
US9629052B2Apr 18, 2017
Traffic management server
HITACHI LTD2 citations73
US5456115AOct 10, 1995
Method of counterflow through a pump and method of controlling the operation of a pump in a pumping installation
HITACHI LTD9 citations72
US5265002ANov 23, 1993
Fault protection for a multiphase bridge power converter
HITACHI LTD15 citations72
US5090872AFeb 25, 1992
Method of controlling the operation of a pump in a pumping installation by detecting counterflow
HITACHI LTD11 citations72
US4766360AAug 23, 1988
Induction generator/motor system
HITACHI LTD9 citations72
US4980629ADec 25, 1990
AC-excited generator/motor apparatus
HITACHI LTD13 citations70
US4743826AMay 10, 1988
Pumping-up generator/motor system and method of operation of the same
HITACHI LTD4 citations60
TOYOTA MOTOR CO LTD
6 patentsUS12477434B2Nov 18, 2025
Wireless communication apparatus, information processing apparatus and information processing method
TOYOTA MOTOR CO LTD0 citations62
US12356303B2Jul 8, 2025
Information processing apparatus and communication system
TOYOTA MOTOR CO LTD0 citations62
US12244746B2Mar 4, 2025
Wireless communication apparatus and vehicle
TOYOTA MOTOR CO LTD0 citations62
US12028801B2Jul 2, 2024
Communications device, vehicle, control method, and control program
TOYOTA MOTOR CO LTD0 citations62
US12292735B2May 6, 2025
Information processing apparatus and information processing method
TOYOTA MOTOR CO LTD0 citations52
US11423707B2Aug 23, 2022
In-vehicle device and vehicle information collection system
TOYOTA MOTOR CO LTD0 citations52