Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5641578 | Weldable black steel sheet | Naoto Yoshimi, Masaaki Yamashita, Toshiyuki Ookuma, Toyofumi Watanabe, Tsutomu Watanabe | 1997-06-24 |
| 5609968 | Weldable colored steel sheet | Naoto Yoshimi, Toyofumi Watanabe, Masaaki Yamashita, Toshiyuki Ookuma | 1997-03-11 |