Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6764526 | Dry air filter for combusion engines of vehicles | Erich Freytag, Gerd Rathke | 2004-07-20 |
| 6585789 | Dry air filter for internal combustion engines of utility vehicles | Siegfried Dippman, Lothar Kroneck, Gerd Rathke | 2003-07-01 |