Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7569707 | Production method of highly pure pyromellitic dianhydride | Hiroshi Ogawa, Atsushi Okoshi, Masato Inari | 2009-08-04 |
| 6458994 | Process for producing aromatic polycarboxylic acid | Atsushi Okoshi, Etsuo Urabe, Hiroshi Ogawa, Kazuo Tanaka | 2002-10-01 |
| 5895820 | Process for the production of trimellitic acid and process for the production of trimellitic acid anhydride | Kazuo Tanaka, Hiroshi Ogawa, Atsushi Ohkoshi | 1999-04-20 |