Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6454826 | Filter cartridge | Dieter Schottmer | 2002-09-24 |
| 6045598 | Filter insert | Uwe Felber | 2000-04-04 |
| 5792228 | Accordion filter pack that is bendable in only one direction | Harald Betz | 1998-08-11 |