Inventor
NOZAWA YUSAKU
JP19 patents
Patents
19 patentsUS6438952B1Aug 27, 2002
Hydraulic circuit device
HITACHI CONSTRUCTION MACHINERY22 citations92
US6408876B1Jun 25, 2002
Control valve
HITACHI CONSTRUCTION MACHINERY35 citations92
US6327959B1Dec 11, 2001
Directional control valve device
HITACHI CONSTRUCTION MACHINERY23 citations92
US5433076AJul 18, 1995
Hydraulic control valve apparatus and hydraulic drive system
HITACHI CONSTRUCTION MACHINERY27 citations92
US5083430AJan 28, 1992
Hydraulic driving apparatus
HITACHI CONSTRUCTION MACHINERY43 citations92
US6244048B1Jun 12, 2001
Hydraulique drive device
HITACHI CONSTRUCTION MACHINERY37 citations91
US5333449AAug 2, 1994
Pressure compensating valve assembly
HITACHI CONSTRUCTION MACHINERY36 citations91
US5921165AJul 13, 1999
Hydraulic control system
HITACHI CONSTRUCTION MACHINERY29 citations90
US4945723AAug 7, 1990
Flow control valves for hydraulic motor system
HITACHI CONSTRUCTION MACHINERY23 citations89
US6422009B1Jul 23, 2002
Pump capacity control device and valve device
HITACHI CONSTRUCTION MACHINERY18 citations83
US6378302B1Apr 30, 2002
Hydraulic circuit system
HITACHI CONSTRUCTION MACHINERY17 citations83
US5485724AJan 23, 1996
Hydraulic drive system
HITACHI CONSTRUCTION MACHINERY19 citations82
US4938022AJul 3, 1990
Flow control system for hydraulic motors
HITACHI CONSTRUCTION MACHINERY12 citations74
US6453585B1Sep 24, 2002
Hydraulic drive device of working machine
HITACHI CONSTRUCTION MACHINERY9 citations73
US6135149AOct 24, 2000
Pressure compensating valves
HITACHI CONSTRUCTION MACHINERY8 citations73
US5957159ASep 28, 1999
Directional control valve with flow distribution valves
HITACHI CONSTRUCTION MACHINERY12 citations73
US4942900AJul 24, 1990
Pressure control valve
HITACHI CONSTRUCTION MACHINERY4 citations56
US6681794B2Jan 27, 2004
Unloading valve
HITACHI CONSTRUCTION MACHINERY1 citations51
US5140815AAug 25, 1992
Valve apparatus
HITACHI CONSTRUCTION MACHINERY0 citations40