Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889697 | Method of refining ferrous ion-containing acid solution | Tsutomu Fukushima, Tsugio Nakao, Kasane Yamashita, Katsuhiro Nishi | 1989-12-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889697 | Method of refining ferrous ion-containing acid solution | Tsutomu Fukushima, Tsugio Nakao, Kasane Yamashita, Katsuhiro Nishi | 1989-12-26 |