Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4363686 | Process for the production of imitation suedes by the reversal process | — | 1982-12-14 |
| 4211529 | Chrome-tanning | Heinrich Spahrkas, Josef Muller, Wolfhard Luck | 1980-07-08 |