Yoshito Tsuyama

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Kitakyushu, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for manufacturing spiral-welded steel pipe
- Patent number 4,645,893
- Issue date Feb 24, 1987
- Nippon Steel Corporation
- Yasumi Shimazaki
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of manufacturing metal pipe with longitudinally differentiat...
- Patent number 4,603,806
- Issue date Aug 5, 1986
- Nippon Steel Corporation
- Kazuo Watanabe
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method and apparatus for manufacturing spiral pipe
- Patent number 4,436,239
- Issue date Mar 13, 1984
- Nippon Steel Corporation
- Yoshito Tsuyama
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR