Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869824 | Bubble plate system for biological purification of air and waste water | Thomas Melin, Otto Barth | 1989-09-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869824 | Bubble plate system for biological purification of air and waste water | Thomas Melin, Otto Barth | 1989-09-26 |