Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5501709 | Economy and plumping chrome tanning | — | 1996-03-26 |
| 4978361 | Economy chrome tanning | Norbert Munch | 1990-12-18 |
| 4935031 | Process for short-term preservation of rawhides and skins | Norbert Munch | 1990-06-19 |
| 4715861 | Economy chrome tanning process with aldehyde-acids and keto-acids | Werner Lotz, Siegmund Haller | 1987-12-29 |