Hiroto Nakagawa

Person

Mishima, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Traffic management server
- Patent number 9,629,052
- Issue date Apr 18, 2017
- Hitachi, Ltd.
- Hideki Okita
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Multi-hop relay radio communication system, access gateway, and rou...
- Patent number 8,699,402
- Issue date Apr 15, 2014
- Hitachi, Ltd.
- Hiroto Nakagawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Communication system and method, and gateway
- Patent number 8,400,983
- Issue date Mar 19, 2013
- Hitachi, Ltd.
- Hiroto Nakagawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Pump turbine, method of controlling thereof, and method of stopping...
- Patent number 6,602,044
- Issue date Aug 5, 2003
- Takao Kuwabara
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
Method of controlling a pump turbine
- Patent number 6,336,322
- Issue date Jan 8, 2002
- Hitachi, Ltd.
- Takao Kuwabara
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Variable speed pumping-up generator
- Patent number 5,561,358
- Issue date Oct 1, 1996
- Hitachi, Ltd.
- Takao Kuwabara
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method of counterflow through a pump and method of controlling the...
- Patent number 5,456,115
- Issue date Oct 10, 1995
- Hitachi, Ltd.
- Takao Kuwabara
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Fault protection for a multiphase bridge power converter
- Patent number 5,265,002
- Issue date Nov 23, 1993
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Semiconductor electric power conversion system enabling fault and/o...
- Patent number 5,099,409
- Issue date Mar 24, 1992
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method of controlling the operation of a pump in a pumping installa...
- Patent number 5,090,872
- Issue date Feb 25, 1992
- Hitachi Ltd.
- Takao Kuwabara
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Variable speed pumping-up system
- Patent number 5,026,256
- Issue date Jun 25, 1991
- Hitachi, Ltd.
- Takao Kuwabara
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
AC-excited generator/motor apparatus
- Patent number 4,980,629
- Issue date Dec 25, 1990
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power system and synchronizing breakers for a variable speed genera...
- Patent number 4,952,852
- Issue date Aug 28, 1990
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Control system for a variable speed hydro-power plant apparatus
- Patent number 4,920,277
- Issue date Apr 24, 1990
- Hitachi, Ltd.
- Takao Kuwabara
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
Variable-speed power generating system
- Patent number 4,870,339
- Issue date Sep 26, 1989
- Hitachi Ltd.
- Yosio Furukawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Control system for variable speed water-wheel generator apparatus
- Patent number 4,823,018
- Issue date Apr 18, 1989
- Hitachi Ltd.
- Takao Kuwabara
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Protecting apparatus for secondary excitation type variable speed A...
- Patent number 4,812,729
- Issue date Mar 14, 1989
- Hitachi Ltd.
- Akio Ito
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Variable-speed generator/motor system
- Patent number 4,812,730
- Issue date Mar 14, 1989
- Hitachi, Ltd.
- Hiroto Nakagawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Induction generator/motor system
- Patent number 4,766,360
- Issue date Aug 23, 1988
- Hitachi, Ltd.
- Eiji Haraguchi
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Control apparatus for variable-speed hydraulic power generating system
- Patent number 4,754,156
- Issue date Jun 28, 1988
- Hitachi, Ltd.
- Junichi Shiozaki
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
Pumping-up generator/motor system and method of operation of the same
- Patent number 4,743,826
- Issue date May 10, 1988
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Control system for variable speed hydraulic turbine generator appar...
- Patent number 4,694,189
- Issue date Sep 15, 1987
- Hitachi, Ltd.
- Eiji Haraguchi
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
TRAFFIC MANAGEMENT SERVER AND MANAGEMENT PROGRAM
- Publication number 20150334042
- Publication date Nov 19, 2015
- Hitachi, Ltd
- Rintaro KATAYAMA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
TRAFFIC MANAGEMENT SERVER
- Publication number 20150312827
- Publication date Oct 29, 2015
- Hitachi, Ltd
- Hideki OKITA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
MULTI-HOP RELAY RADIO COMMUNICATION SYSTEM, ACCESS GATEWAY, AND ROU...
- Publication number 20120008544
- Publication date Jan 12, 2012
- Hitachi, Ltd
- Hiroto Nakagawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
COMMUNICATION SYSTEM AND METHOD, AND GATEWAY
- Publication number 20110280215
- Publication date Nov 17, 2011
- Hitachi, Ltd.
- HIROTO NAKAGAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Hiroto Nakagawa

Person

Patents Grantslast 30 patents

Traffic management server

Multi-hop relay radio communication system, access gateway, and rou...

Communication system and method, and gateway

Pump turbine, method of controlling thereof, and method of stopping...

Method of controlling a pump turbine

Variable speed pumping-up generator

Method of counterflow through a pump and method of controlling the...

Fault protection for a multiphase bridge power converter

Semiconductor electric power conversion system enabling fault and/o...

Method of controlling the operation of a pump in a pumping installa...

Variable speed pumping-up system

AC-excited generator/motor apparatus

Power system and synchronizing breakers for a variable speed genera...

Control system for a variable speed hydro-power plant apparatus

Variable-speed power generating system

Control system for variable speed water-wheel generator apparatus

Protecting apparatus for secondary excitation type variable speed A...

Variable-speed generator/motor system

Induction generator/motor system

Control apparatus for variable-speed hydraulic power generating system

Pumping-up generator/motor system and method of operation of the same

Control system for variable speed hydraulic turbine generator appar...

Patents Applicationslast 30 patents

TRAFFIC MANAGEMENT SERVER AND MANAGEMENT PROGRAM

TRAFFIC MANAGEMENT SERVER

MULTI-HOP RELAY RADIO COMMUNICATION SYSTEM, ACCESS GATEWAY, AND ROU...

COMMUNICATION SYSTEM AND METHOD, AND GATEWAY