Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5002655 | Process for the recovery of aromatic nitrogen-containing compounds | Koji Ukegawa, Akimitsu Matsumura, Kazumasa Yazu | 1991-03-26 |
| 4406772 | Hydroconversion of heavy hydrocarbon oils | Yoshiyuki Sasaki, Etsuro Nakamura, Yoshimoto Ojima, Koji Ukegawa, Akimitsu Matsumura | 1983-09-27 |