Yasuaki Ishikawa

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Patents Grantslast 30 patents

Information Patent Grant
Hydraulic muck handling system for tunnel boring machine
- Patent number 6,142,577
- Issue date Nov 7, 2000
- Hitachi Construction Machinery Co., Ltd.
- Minoru Tayama
- E21 - EARTH DRILLING MINING
Information Patent Grant
Vibratory compaction working machine
- Patent number 4,735,523
- Issue date Apr 5, 1988
- Hitachi Construction Machinery Co., Ltd.
- Yasuaki Ishikawa
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Cutter head for pit-boring machine
- Patent number 4,448,269
- Issue date May 15, 1984
- Hitachi Construction Machinery Co., Ltd.
- Yasuaki Ishikawa
- E21 - EARTH DRILLING MINING