Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5911946 | Snorkel for a degassing vessel | Harald Harmuth, Heinrich Niehues, Armin Pertl | 1999-06-15 |
| 5853658 | Gas purging device in the blowpipe of a degassing vessel | Heinrich Niehues | 1998-12-29 |