Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6794014 | Gemstone | Lothar Schäfer, Thorsten Matthee | 2004-09-21 |
| 6447561 | Abrasive body | Hans-Joachim Wiemann | 2002-09-10 |
| 5346768 | Soda-lime glass containing vanadium | Friedrich Marwan, Joachim Bretschneider, Hubert Drexler | 1994-09-13 |