Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5476533 | Process for sintering iron oxide-containing materials on a sintering machine | Fred Stieler, Norbert Magedanz, Walter Gerlach, Jurgen Otto, Martin Hirsch +4 more | 1995-12-19 |
| 4969775 | Process of dressing contaminated soils | Dirk Hankel, Heinrich Meiler, Friedrich Rosenstock | 1990-11-13 |
| 4747356 | Process of burning cattle dung | Hans Beisswenger, Dirk Hankel, Walter Koch | 1988-05-31 |