Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4971656 | Flotation process for deinking printed waste paper | Klaus Lehmann, Hans Hawel, Gregor Schuster | 1990-11-20 |
| 4959123 | Process for deinking printed waste paper | Klaus Lehmann, Hans Hawel | 1990-09-25 |