Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5656209 | Process for manufacture of Fresnel lenses | Volker Benz, Martin Berkenkopf, Udo Fischer, Hans Lorenz | 1997-08-12 |
| 5639404 | Method and apparatus for preparing thermoplastic sheets, films, and plates | Horst Greb | 1997-06-17 |
| 5637408 | Thermoplastic multilayer composite having a good adhesion between layers | Georg Oenbrink, Stefan Rober | 1997-06-10 |