Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830818 | Ceramic installations | Claus Elter, Hermann Schmitt, Josef Schoening, Ulrich Weicht | 1989-05-16 |
| 4798700 | Ceramic installations | Claus Elter, Herrmann Schmitt, Josef Schoening | 1989-01-17 |