Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6136183 | Relief valve for filter device | Yasuyoshi Suzuki, Shuji Yamaguchi, Kouichi Tomitaka | 2000-10-24 |
| 4746432 | Filter element with zig-zag pleats | Yoshihiro Taki, Hajime Akado, Satoshi Inukai | 1988-05-24 |
| 4640779 | Filter element | Yoshihiro Taki, Hajime Akado, Satoshi Inukai | 1987-02-03 |