Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6767424 | Hot-melt adhesive for glueing DVDs | Ruediger Butterbach, Dirk Bonke, Siegfried Kopannia | 2004-07-27 |
| 6677394 | Swellable hotmelt adhesive | Ruediger Butterbach, Siegfried Kopannia, Marcus Heemann | 2004-01-13 |