Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886906 | Process for producing 2,6-naphthalene dicarboxylic acid | Masato Inari | 1989-12-12 |
| 4824992 | Process for producing pyromellitic acid | Tomiyoshi Furuta, Kazue Suwa | 1989-04-25 |