Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5114444 | Filter arrangement including at least one drum-type filter | — | 1992-05-19 |
| 4904282 | Filter apparatus and method of operating same | Heinz Burkhardt, Josef Velinsky | 1990-02-27 |