Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4390432 | Method of purifying water in fish keeping water tank | Isao Oyobe | 1983-06-28 |
| 4320085 | Method of inhibiting and eliminating chlorophyceae in water in tank | Isao Oyobe | 1982-03-16 |
| 4297222 | Method of purifying water in fish keeping water tank | Isao Oyobe | 1981-10-27 |