Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6828461 | Process for producing 1,5-diaminonaphthalene | Yukihiro Kumamoto, Masazumi Takaoka, Hideki Mizuta | 2004-12-07 |
| 6800674 | Anthraquinone compound and water-based ink-jet recording ink containing the compound | Osamu Kohgo, Tadashi Okuma, Ryu Oi | 2004-10-05 |
| 6758890 | Aqueous ink and process for producing dye | Kenichi Fujii, Osamu Kohgo, Hiroshi Naruse, Tsutami Misawa | 2004-07-06 |