Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6249375 | Optical element for traffic signs, display panels or the like | Franz Silhengst, Alexander Otto | 2001-06-19 |
| 6078439 | Optics unit for signal, traffic and display equipment, arrangement of the same therein and method therefore | Franz Silhengst, Alexander Otto | 2000-06-20 |