Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5147474 | Building construction steel having excellent fire resistance and low yield ratio | Hiroshi Tamehiro, Rikio Chiziiwa, Yoshifumi Sakumoto, Kazuo Funato, Yuzuru Yoshida | 1992-09-15 |
| 4990196 | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio | Hiroshi Tamehiro, Rikio Chiziiwa, Yoshifumi Sakumoto, Kazuo Funato, Yuzuru Yoshida | 1991-02-05 |