Issued Patents All Time
Showing 26–37 of 37 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6239263 | Water-soluble azo compounds and process for the preparation thereof | Ryuzo Ueno, Kenji Minami, Masaharu Kittaka | 2001-05-29 |
| 6194608 | Process for separating and purifying alkali metal salts of hydroxynaphthalenecarboxylic acids | Ryuzo Ueno, Kuniyo Yanagawase, Yoshiro Uchiyama, Shigeji Mori | 2001-02-27 |
| 6133475 | Process for producing 2-hydroxynaphthalene-3,6-dicarboxylic acid | Ryuzo Ueno, Yoshiro Uchiyama, Syungo Nara | 2000-10-17 |
| 6084101 | Naphtol derivative and process for producing the same | Ryuzo Ueno, Kenji Minami, Hiroyuki Wakamori | 2000-07-04 |
| 6072042 | Bis(aminocarbonylnaphthol) derivative | Ryuzo Ueno, Kenji Minami, Hiroyuki Wakamori, Katsunori Tanikawa, Mariko Tanigawa | 2000-06-06 |
| 6020470 | Water-soluble azo compounds and process for producing the same | Ryuzo Ueno, Kenji Minami, Masaharu Kittaka | 2000-02-01 |
| 6005085 | Condensed azo compounds and process for preparing the same | Ryuzo Ueno, Kenji Minami, Hiroyuki Wakamori, Katsunori Tanikawa | 1999-12-21 |
| 5973126 | Azo compounds and process for producing the same | Ryuzo Ueno, Kenji Minami, Hiroyuki Wakamori | 1999-10-26 |
| 5965715 | Bisazo compounds and process for the preparation thereof | Ryuzo Ueno, Kenji Minami, Hiroyuki Wakamori | 1999-10-12 |
| 5847233 | Naphthol derivatives and process for producing the same | Ryuzo Ueno, Shigeru Ito, Kenji Minami | 1998-12-08 |
| 5786523 | Naphthol derivatives and process for producing the same | Ryuzo Ueno, Shigeru Ito, Kenji Minami | 1998-07-28 |
| 5770766 | Method for separating and purifying hydroxynaphtalenecarboxylic acids | Ryuzo Ueno, Kuniyo Yanagawase, Yoshiro Uchiyama, Shigeji Mori | 1998-06-23 |