Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6077424 | Method for aerobically treating wastewater and a treatment tank for such method | Takehiko Yamada, Koji Mishima, Akinori Nishii, Sota Nakagawa, Eiji Tochikubo | 2000-06-20 |
| 6015490 | Carrier-separating and water-collecting mechanism of wastewater treatment equipment | Takehiko Yamada, Eiji Tochikubo | 2000-01-18 |