Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7588615 | Filter element with drainage tube | Eric Gillenberg, Wolfgang Heikamp, Melanie Hirsch, Sandra Poelloth, Hans-Michael Winter | 2009-09-15 |
| 7097683 | Filter element with a drainage tube | Wolfgang Heikamp, Markus Zuerker | 2006-08-29 |