Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5615522 | Roof window with positioning assembly | — | 1997-04-01 |
| 5581941 | Vent and tilt roof window providing an exit | Michael Sill, Wolfgang Radle | 1996-12-10 |
| 5205074 | Counterbalanced window operators | James C. Guhl, Jurgen R. Martens, Hartmut Ginnow-Merkert | 1993-04-27 |