Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5688117 | Rotatable heating chamber with internal tubes for waste | Karl May, Karlheinz Unverzagt, Herbert Tratz, Helmut Werdinig | 1997-11-18 |
| 5673748 | Heating chamber for solid material | Karl May, Karlheinz Unverzagt, Helmut Werdinig | 1997-10-07 |
| 5611290 | Waste conveyor | Herbert Tratz, Karl May, Karlheinz Unverzagt | 1997-03-18 |