Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4297216 | Method for treatment of biochemical waste | Masahiko Ishida, Ryooichi Haga | 1981-10-27 |
| 4203841 | Apparatus for high-efficient microbiological oxidation treatment | Norio Shimizu, Tetsuo Yamaguchi, Setsuo Saitou, Azuma Nakaoka, Kazuaki Ichihashi | 1980-05-20 |
| 4202763 | High-efficient activated sludge method | Norio Shimizu | 1980-05-13 |