Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5153339 | Process for separation of naphthoquinone and phthalic acid | Ryo Matsuura, Kenji Usui, Toru Sato | 1992-10-06 |
| 4632782 | Oxidizing an organic compound | Shigeaki Numata, Katsuhiko Hioki, Toshihiko Sumino | 1986-12-30 |
| 4536337 | Process for the preparation of quinones | Shigeaki Numata, Toshihiko Sumino, Katsumi Matsuzaki, Masao Narita, Katsuhiko Hioki | 1985-08-20 |
| 4530745 | Method for electrolyzing cerous sulfate | Shigeaki Numata, Katsuhiko Hioki, Toshihiko Sumino | 1985-07-23 |
| 4450111 | Process for the purification of anthraquinone | Shigeaki Numata, Kazuhiro Maruyama | 1984-05-22 |
| 4412954 | Process for producing 1,4,4a,9a-tetrahydroanthraquinone compound | Kenji Usui | 1983-11-01 |
| 4369140 | Process for producing hydroanthraquinones | Kenji Usui, Shigeaki Numata | 1983-01-18 |
| 4202828 | Process for separation of naphthoquinone and phthalic acid | Ryo Matsuura, Yukio Nomiyama, Kenji Usui | 1980-05-13 |