HITACHI MITSUBISHI HYDRO CORPORATION

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS 483
 
  
 
H02K DYNAMO-ELECTRIC MACHINES 3104
 
  
 
F03B MACHINES OR ENGINES FOR LIQUIDS 222
 
  
 
G05D SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES 282
 
  
 
F01B MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES 126
 
  
 
F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR 144
 
  
 
F16D COUPLINGS FOR TRANSMITTING ROTATION 190
 
  
 
H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS 176

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9494127 Pumped storage power plantAug 15, 14Nov 15, 16[F03B]
8421318 Rotor of rotating electrical machineMay 05, 11Apr 16, 13[H02K]
8183735 Rotating electrical machineMay 06, 09May 22, 12[H02K]
8115445 Operation control method and operation control apparatus for variable speed generator-motorOct 07, 09Feb 14, 12[H02P]
8111048 Double fed synchronous generator motorDec 15, 08Feb 07, 12[H02P]
8004145 Electric rotating machineMay 13, 09Aug 23, 11[H02K]
7225719 Speed governor and distributing valve for hydraulic turbinesMay 23, 05Jun 05, 07[F15B]
7092795 Turbine apparatus and governor for turbineOct 03, 03Aug 15, 06[G05D]
7072744 Turbine apparatus and governor for turbineMay 31, 05Jul 04, 06[G05D]
6794855 Voltage stabilization control method and voltage stabilization control apparatusJun 21, 02Sep 21, 04[H02P, H02H]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6602044 Pump turbine, method of controlling thereof, and method of stopping thereofExpiredOct 27, 00Aug 05, 03[F04D]
6250887 Reversible pump-turbine systemExpiredJan 14, 99Jun 26, 01[F04B]

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