Toshiyuki Ookuma

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Weldable black steel sheet
- Patent number 5,641,578
- Issue date Jun 24, 1997
- NKK Corporation
- Naoto Yoshimi
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Weldable colored steel sheet
- Patent number 5,609,968
- Issue date Mar 11, 1997
- NKK Corporation
- Naoto Yoshimi
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...