Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5120584 | Insulating glass pane for motor vehicles | Hans Ohlenforst, Hans-Peter Siemonsen | 1992-06-09 |
| 4875308 | Adjustable insulating glass window | Peter Scheeren, Hans-Peter Siemonsen, Ralf Reinicke, Lothar Witting, Aloisius Schafhausen | 1989-10-24 |