Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5573671 | Method of and apparatus for water purification | — | 1996-11-12 |
| 4931183 | Process and apparatus for the biological purification of water | Klaus Kratzenstein | 1990-06-05 |
| 4215101 | Method and apparatus for performing chemical and/or physical treatments | Ernst Kriegel, Dietrich Radke, Carlos Arbeletche | 1980-07-29 |