Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818374 | Process for converting coal to an oil fraction | Yoichi Kageyama, Yukio Nakako, Tetsuo Matsumura | 1989-04-04 |
| 4541914 | Process for converting coal | Yoichi Kageyama, Yukio Nakako, Tetsuo Matsumura | 1985-09-17 |