Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874427 | Methods for melting and refining a powdery ore containing metal oxides | Takao Hamada, Nobuo Tsuchiya, Toshihiro Inatani, Toshimitsu Koitabashi, Kyoji Okabe +2 more | 1989-10-17 |