Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4826948 | Impregnating agent and its use | Hanns P. Muller, Roland Richter, Dietmar Schapel, Rudolf Schmidt | 1989-05-02 |
| 4810536 | Method of impregnating | Hanns P. Muller, Roland Richter, Dietmar Schapel, Rudolf Schmidt | 1989-03-07 |