Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5618431 | Method of cleaning floating filter medium for biological filtering apparatus | Masao Kondo, Michihiro Fujii | 1997-04-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5618431 | Method of cleaning floating filter medium for biological filtering apparatus | Masao Kondo, Michihiro Fujii | 1997-04-08 |