Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7514062 | Process for the production of furnace black | Peter Kopietz, Johann Mathias | 2009-04-07 |
| 5250332 | Heat-shrinkable envelope having low-tearing susceptibility | Andreas Kupczyk | 1993-10-05 |