Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6369240 | Gas-phase oxidization process and process for the preparation of phthalic anhydride | Nobuyoshi Nakamura | 2002-04-09 |
| 5225572 | Process for producing pyromellitic dianhydride | Noboru Daito, Masakazu Takeuchi, Kunio Wada | 1993-07-06 |
| 4879387 | Method for manufacture of phthalic anhydride | — | 1989-11-07 |
| 4469878 | Method for manufacture of phthalic anhydride | Masataka Kaneyasu | 1984-09-04 |