Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5112513 | Solution and process for etching and activating surfaces of a nonconductive substrate | Burkhard Bressel, Hans-Joachim Grapentin | 1992-05-12 |
| 4940554 | Conditioning agent for the treatment of base materials | Hans-Joachim Grapentin, Hubert-Matthias Seidenspinner | 1990-07-10 |
| 4781990 | Conditioning agent for the treatment of base materials | Hans-Joachim Grapentin, Hubert-Matthias Seidenspinner | 1988-11-01 |