Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7091261 | Yellow hue compound and aqueous ink for ink-jet recording system using the same | Tadashi Okuma, Ryu Oi, Osamu Kohgo | 2006-08-15 |
| 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 |
| 5804102 | Plasma display filter | Ryu Oi, Kazuhiro Seino, Yuko Mochizuki, Keisuke Takuma, Shin Fukuda +1 more | 1998-09-08 |
| 5750599 | Quinophthalone compounds and polarizing films using same | Akira Ogiso, Rihoko Imai, Tsutami Misawa, Ryu Oi, Hisato Itoh | 1998-05-12 |
| 5698682 | Azo compounds and polarizing films using the compounds | Ryu Oi, Rihoko Imai, Keisuke Takuma, Hisato Itoh | 1997-12-16 |
| 5659039 | Quinophthalone compounds | Akira Ogiso, Rihoko Imai, Tsutami Misawa, Ryu Oi, Hisato Itoh | 1997-08-19 |
| 5639809 | Azo compounds and polarizing films using the compounds | Ryu Oi, Rihoko Imai, Keisuke Takuma, Hisato Itoh | 1997-06-17 |
| 5387686 | Dye for heat-sensitive transfer record and ink composition for heat-sensitive transfer record | Tsukasa Ohyama, Yasushi Shimokawa, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida +4 more | 1995-02-07 |
| 5359075 | Quinophthalone compound | Tsukasa Ohyama, Yasushi Shimokawa, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida | 1994-10-25 |
| 5296445 | Dye for heat-sensitive transfer record, ink composition for heat-sensitive transfer record, and transfer sheet | Tsukasa Ohyama, Yasushi Shimokawa, Keisuke Takuma, Isamu Ghoda, Hitoshi Koshida +4 more | 1994-03-22 |
| 5248784 | 4-carbonyl-substituted coumarin compound | Tsukasa Ohyama, Kazuhiko Murayama, Susumu Kasamatsu, Keisuke Takuma, Kimitoshi Kato | 1993-09-28 |
| 5045434 | Visible radiation sensitive composition containing substituted 3-(benzothiazo-2-yl)-7-diethylaminocoumarin as sensitizers | Ichiro Yoshihara, Motoko Okuhara, Takao Yamamoto, Naozumi Iwasawa, Yasuo Doi +5 more | 1991-09-03 |