Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9469048 | Polyimide powder having high thermooxidative stability | Markus Ungerank, Christian Maurer, Dieter Danzer, Harald Roegl | 2016-10-18 |
| 6161598 | Method for producing helically wound filament elements, and filament elements produced according to this method | Hans Liermann, Peter Schmidt, Reinhard Sprenger | 2000-12-19 |
| 5932955 | Double-based, double-ended, pinch-sealed electric lamp with integral base | Helmut Berger, Hans Liermann | 1999-08-03 |
| 5686794 | Halogen incandescent lamp with filament positioning arrangement | Hans-Juergen Streppel, Hans Liermann | 1997-11-11 |