Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5200603 | Source distance adjustment arrangement for uniform illumination of projection surface | Hubert Hackenberg, Traugott Liermann | 1993-04-06 |
| 5003343 | Projection copying apparatus and projection screen therefor | Hubert Hackenberg, Traugott Liermann, Franz Nadler, Herbert Plaschke | 1991-03-26 |