Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4814048 | Pb alloy insoluble anode and continuous electroplating of zinc using it | Tadashi Nonaka | 1989-03-21 |
| 4806178 | Non-heat refined steel bar having improved toughness | Yoshiro Koyasu, Yutaka Tsuchida | 1989-02-21 |