Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5387335 | Filter circulating type sewage disposal apparatus | Isamu Iwai | 1995-02-07 |
| 5308479 | Sewage disposal apparatus employing circulating filter media | Isamu Iwai | 1994-05-03 |