Kunio Koyama

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Machida, JP

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Patents Grantslast 30 patents

Information Patent Grant
Process for production of a low hydrogen type covered arc-electrode
- Patent number 4,355,054
- Issue date Oct 19, 1982
- Nippon Steel Corporation
- Kyoichi Nagano
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Non-fused flux composition for submerged-arc welding
- Patent number 4,221,611
- Issue date Sep 9, 1980
- Nippon Steel Corporation
- Kyoichi Nagano
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR