Kenko Okamura

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Double walled pipe, jacking method and pipe end structure of leadin...
- Patent number 6,109,305
- Issue date Aug 29, 2000
- Kawasaki Steel Corp
- Tomoya Fujimoto
- E21 - EARTH DRILLING MINING
Information Patent Grant
Double walled pipe, jacking method and pipe end structure of leadin...
- Patent number 6,004,073
- Issue date Dec 21, 1999
- Kawasaki Steel Corp
- Tomoya Fujimoto
- E21 - EARTH DRILLING MINING
Information Patent Grant
Double walled pipe, jacking method and pipe end structure of leadin...
- Patent number 5,615,976
- Issue date Apr 1, 1997
- Kawasaki Steel Corp
- Tomoya Fujimoto
- E21 - EARTH DRILLING MINING