Inventor
Nobuhiko Ichiki
Inventor
Ibaraki, JP
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F15Bprimary
F15BSystems acting by means of fluids in general29%
Y10TTechnical subjects covered by former us classification25%
E02FDredging21%
F16KValves8%
F16HGearing4%
G05GControl devices or systems insofar as characterised by mechanical features only4%
H01FMagnets4%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests4%
PatentTitleYear
7,265,304'Joystick for electro-hydraulic control system'20076,327,959'Directional control valve device'20016,135,149'Pressure compensating valves'20005,957,159'Directional control valve with flow distribution valves'19995,921,165'Hydraulic control system'19995,485,724'Hydraulic drive system'19965,301,920'High-speed solenoid valve apparatus'19944,919,390'Solenoid operated valve apparatus'19904,706,932'Fluid control valve apparatus'1987Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1987–2007Patents assigned to HITACHI CONSTRUCTION MACHINERY (9)· patent assignee history
1987–2001Based in Ibaraki, JP· patent location history
1990Based in Kashiwa, JP· patent location history
2007Based in Tsuchiura, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI CONSTRUCTION MACHINERY | 9 | 1987–2007 |
Locations
| Location | Patents | Span |
|---|---|---|
| Ibaraki, JP | 7 | 1987–2001 |
| Tsuchiura, JP | 1 | 2007 |
| Kashiwa, JP | 1 | 1990 |