Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6428594 | Filter cartridge made of an accordion fold pack folded in a zigzag-shaped manner and method for its manufacture | Richard Borris | 2002-08-06 |
| 5779747 | Flexible folded filter insert | Ulrich Schlor | 1998-07-14 |
| 5695535 | Pocket filter | Dieter Unrath, Udo Michaelis, Margit Hofmann | 1997-12-09 |