Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6194608 | Process for separating and purifying alkali metal salts of hydroxynaphthalenecarboxylic acids | Ryuzo Ueno, Masaya Kitayama, Kuniyo Yanagawase, Yoshiro Uchiyama | 2001-02-27 |
| 5770766 | Method for separating and purifying hydroxynaphtalenecarboxylic acids | Ryuzo Ueno, Masaya Kitayama, Kuniyo Yanagawase, Yoshiro Uchiyama | 1998-06-23 |