Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4440833 | Copper-laminated hard paper made of a fire resistant laminate | Siegfried Koepnick | 1984-04-03 |
| 4397882 | Process for the production of hard paper | Ernst Schneider, Gregor Jakobshagen | 1983-08-09 |
| 4360560 | Base material for the production of printed circuits and process for the preparation of the base material | Siegfried Kopnick, Dirk Huthwelker, Lothar Jacob | 1982-11-23 |
| 4317856 | Insulating-material bodies having metal particles dispersed in the resin | Dirk Huthwelker, Siegfried Kopnick | 1982-03-02 |