Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854968 | Method of preparing high-purity metal and rotary cooling member for use in apparatus therefor | Ryotatsu Otsuka, Kazuo Toyoda | 1989-08-08 |
| 4804168 | Apparatus for treating molten metal | Ryotatsu Otsuka, Kazuo Toyoda | 1989-02-14 |