Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4994838 | Wet processing arrangement and method for photographic reversal material | Georg Fryda, Wilfried Hehn | 1991-02-19 |
| 4918478 | Tank with rack for wet processing photographic material | Werner Sperber, Wilfried Hehn | 1990-04-17 |