Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6811622 | Semifinished and finished products made of austenitic special steel and method for the production thereof | Heinrich Friederich | 2004-11-02 |
| 6540462 | Screw connection | Bernd Bretschneider, Heinrich Friederich | 2003-04-01 |
| 6338600 | Self-tapping, corrosion-resistant screw with hardened tip | Heinrich Friederich | 2002-01-15 |