Koichi Yanagisawa

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Patents Grantslast 30 patents

Information Patent Grant
Packer type groundwater sampling system and water sampling method
- Patent number 5,896,926
- Issue date Apr 27, 1999
- Doryokuro Kakunenryo Kaihatsu Jigyodan
- Katsuhiro Hama
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Hydraulic test system mounted with borehole television set for simu...
- Patent number 5,767,400
- Issue date Jun 16, 1998
- Doryokuro Kakunenryo Kaihatsu Jigyodan
- Katsushi Nakano
- E21 - EARTH DRILLING MINING
Information Patent Grant
Low-water-pressure controlled hydrologic test method
- Patent number 4,986,120
- Issue date Jan 22, 1991
- Doryokuro Kakunenryo Kaihatsu Jigyodan
- Koichi Yanagisawa
- E21 - EARTH DRILLING MINING