Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6194608 | Process for separating and purifying alkali metal salts of hydroxynaphthalenecarboxylic acids | Ryuzo Ueno, Masaya Kitayama, Kuniyo Yanagawase, Shigeji Mori | 2001-02-27 |
| 6133475 | Process for producing 2-hydroxynaphthalene-3,6-dicarboxylic acid | Ryuzo Ueno, Masaya Kitayama, Syungo Nara | 2000-10-17 |
| 5770766 | Method for separating and purifying hydroxynaphtalenecarboxylic acids | Ryuzo Ueno, Masaya Kitayama, Kuniyo Yanagawase, Shigeji Mori | 1998-06-23 |