Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5361478 | Method of inserting a hole forming and selftapping screw | Hermann Grossberndt, Gunter Kretschmer, Ali Hakan Guven | 1994-11-08 |
| 5234301 | Hole forming and selftapping screw | Hermann Grossberndt, Gunter Kretschmer | 1993-08-10 |