Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5759849 | Sludge treatment tank thereof construction method thereof | Keitaro Aoyagi, Sadao Niibe, Toshitomi Umegae, Hideo Iwai | 1998-06-02 |
| 5672506 | Sludge treatment tank and construction method thereof | Keitaro Aoyagi, Sadao Niibe, Toshitomi Umegae, Hideo Iwai | 1997-09-30 |