Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4312742 | Process for the production of a petroleum pitch or coke of a high purity | — | 1982-01-26 |
| 4202868 | Production of high-density carbon materials | Masanao Nakagawa, Kazuo Ozaki, Yoshiharu Ito | 1980-05-13 |