Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6189770 | Method of producing sectional strips and sectional sheets | — | 2001-02-20 |
| 4828570 | Tanning agent and a process for its preparation | Ulrich Riegel, Fritz Engelhardt, Kuno Reh, Helmut Croon, Hermann Becker | 1989-05-09 |
| 4822372 | Processing for tanning leather | Frank Forster, Karlfried Keller, Hermann Becker | 1989-04-18 |
| 4810252 | Process for tanning leather | Hermann Becker, Karlfried Keller | 1989-03-07 |
| 4715861 | Economy chrome tanning process with aldehyde-acids and keto-acids | Karlheinz Fuchs, Siegmund Haller | 1987-12-29 |
| 4709074 | Urethanes containing perfluoroalkyl and epichlorohydrin groups | Heinrich Bathelt, Winfried Ehrl, Frank Wehowsky, Rolf Kleber, Wolfgang Glenz +5 more | 1987-11-24 |