Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5066384 | Process for refining coal-derived heavy carbonaceous materials | Yoshihiko Sunami, Katsumi Satoh, Katsuyuki Ohshima, Kenichi Iwaguro | 1991-11-19 |
| 4671907 | Method of manufacturing carbon materials | Yoshihiko Sunami, Tadashi Miyamura | 1987-06-09 |
| 4402824 | Process for refining coal-based heavy oils | Yoshihiko Sunami, Keiichi Sasaki | 1983-09-06 |