Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4278723 | Shaped body of extruded acrylic glass | Friedrich Hanstein | 1981-07-14 |
| 4223493 | Multi-layered skylight | Friedrich Hanstein | 1980-09-23 |
| 4222210 | Conversion muntins for glazing frames | Friedrich Hanstein | 1980-09-16 |
| 4188425 | Double-walled shaped plastic articles | Friedrich Hanstein, Gunter Schreyer | 1980-02-12 |