Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5416263 | Process for producing 4,4'-Diamino-1,1'-dianthraquinonyl pigments | Iwao Sakaguchi, Katsutoshi Numano, Hiroki Inoue, Yoshiaki Hayashi, Keisuke Ito | 1995-05-16 |
| 5393899 | Process for purification of crude 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulfonic acids and salts thereof | Hiroki Inoue, Iwao Sakaguchi, Katsutoshi Numano, Yoshiaki Hayashi, Keisuke Ito | 1995-02-28 |
| 5320678 | Process for producing 4,4'-diamino-1,1,'-dianthraquinonyl pigments | Hiroki Inoue, Iwao Sakaguchi, Kunitoshi Takahashi, Yoshiaki Hayashi, Keisuke Ito | 1994-06-14 |
| 4785091 | Process for producing copper phthalocyanine pigment | Taira Fujita, Hiroshi Okayasu | 1988-11-15 |