Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6704990 | Method of making chair base | Helmut Berkenkoetter, Walter Mersmann | 2004-03-16 |
| 6644741 | Chair | Patrick Nelson, Werner Hartel | 2003-11-11 |
| 6626404 | Chair base | Helmut Berkenkoetter, Walter Mersmann | 2003-09-30 |