Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4681626 | Method of refining aluminum | Harumi Yokokawa, Seiichi Ujiie, Masayuki Dokiya | 1987-07-21 |
| 4588438 | Moulded object of alumina matter-containing raw material for aluminum smelting by blast furnace method | Masayuki Dokiya, Tetsuya Kameyama, Harumi Yokokawa, Seiichi Ujiie, Kenzo Fukuda | 1986-05-13 |
| 4445934 | Method of manufacturing aluminum by using blast furnace | Masayuki Dokiya, Tetsuya Kameyama, Harumi Yokokawa, Seiichi Ujiie, Kenzo Fukuda +1 more | 1984-05-01 |