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Inventor

Yoshimichi Akasaka

Inventor
Tsuchiura, JP

Overview

6→
Patents
1983–1993
Patent span
Mechanical engineering
Primary field (CPC F)

Patents· 6 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

F04Bprimary
F04BPositive-displacement machines for liquids29%
F16CShafts21%
F15BSystems acting by means of fluids in general14%
F01BMachines or engines, in general or of positive-displacement type, e.g. steam engines7%
F03CPositive-displacement engines driven by liquids7%
F16KValves7%
H01HElectric switches7%
Y10TTechnical subjects covered by former us classification7%
PatentTitleYear
5,231,912'Bent axis type variable displacement hydraulic machine'19935,182,978'Bent axis type variable displacement hydraulic machine'19935,094,144'Bent axis type variable displacement hydraulic machine'19924,788,902'Thrust hydrostatic bearing device for use in axial piston machine'19884,428,559'Direct drive type servo valve'19844,404,892'Hydraulic operating apparatus'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983–1988Patents assigned to HITACHI LTD (3)· patent assignee history
1983–1984Based in Hitachi, JP· patent location history
1988–1993Patents assigned to HITACHI CONSTRUCTION MACHINERY (3)· patent assignee history
1988–1993Based in Tsuchiura, JP· patent location history
1992Patents assigned to AKASAKA YOSHIMICHI (1)· patent assignee history
1992Patents assigned to GOTOH YASUHARU (1)· patent assignee history
1992Patents assigned to NAKAMURA ICHIRO (1)· patent assignee history
1992Based in Ibaraki-shi, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI CONSTRUCTION MACHINERY31988–1993
HITACHI LTD31983–1988
AKASAKA YOSHIMICHIself11992
GOTOH YASUHARU11992
NAKAMURA ICHIRO11992
Locations
LocationPatentsSpan
Tsuchiura, JP31988–1993
Hitachi, JP21983–1984
Ibaraki-shi, JP11992