Akitaka Fujita

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for injecting lubricant or back-filling material into a spac...
- Patent number 5,527,135
- Issue date Jun 18, 1996
- Kabushiki Kaisha Iseki Kaihatsu Koki
- Mitsutoshi Hayashi
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for controlling the direction of a shield tunneling machine...
- Patent number 5,501,548
- Issue date Mar 26, 1996
- Tokyo Gas Co., Ltd.
- Mitsutoshi Hayashi
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for injecting lubricant and filler in the pipe-jacking method
- Patent number 5,484,232
- Issue date Jan 16, 1996
- Tokyo Gas Company Ltd.
- Mitsutoshi Hayashi
- E21 - EARTH DRILLING MINING