Koji Ishikawa

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Ibaraki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Work machine
- Patent number 9,212,469
- Issue date Dec 15, 2015
- Hitachi Construction Machinery Co., Ltd.
- Tsutomu Udagawa
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Hydraulic circuit device of hydraulic working machine
- Patent number 7,487,609
- Issue date Feb 10, 2009
- Hitahi Construction Machinery Co., Ltd.
- Tsuyoshi Nakamura
- F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
Information Patent Grant
Hydraulic circuit system for hydraulic excavator
- Patent number 5,673,558
- Issue date Oct 7, 1997
- Hitachi Construction Machinery Co., Ltd.
- Genroku Sugiyama
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Hydraulic drive system for hydraulic working machines
- Patent number 5,447,027
- Issue date Sep 5, 1995
- Hitachi Construction Machinery Co., Ltd.
- Koji Ishikawa
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Hydraulic drive system for hydraulic working machines
- Patent number 5,421,155
- Issue date Jun 6, 1995
- Hitachi Construction Machinery Co., Ltd.
- Toichi Hirata
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING

Patents Applicationslast 30 patents

Information Patent Application
WORK MACHINE
- Publication number 20140371995
- Publication date Dec 18, 2014
- Tsutomu Udagawa
- B60 - VEHICLES IN GENERAL
Information Patent Application
Hydraulic circuit device of hydraulic working machine
- Publication number 20060080955
- Publication date Apr 20, 2006
- Hitachi Construction Machinery Co., Ltd.
- Tsuyoshi Nakamura
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING