Yoshifumi Sakumoto

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Building construction steel having excellent fire resistance and lo...
- Patent number 5,147,474
- Issue date Sep 15, 1992
- Nippon Steel Corporation
- Hiroshi Tamehiro
- C21 - METALLURGY OF IRON
Information Patent Grant
Process for manufacturing building construction steel having excell...
- Patent number 4,990,196
- Issue date Feb 5, 1991
- Nippon Steel Corporation
- Hiroshi Tamehiro
- C21 - METALLURGY OF IRON