Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889567 | High strength and high toughness steel bar, rod and wire and the process of producing the same | Yukio Yamaoka, Kazuichi Hamada, Yoshiro Yamada, Yasunobu Kawaguchi, Yasuhiro Oki +2 more | 1989-12-26 |