Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4401368 | Projecting screen for optical purposes | Ludwig Drechsel | 1983-08-30 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4401368 | Projecting screen for optical purposes | Ludwig Drechsel | 1983-08-30 |