Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8372161 | Method for the reactive coloring of leather | Laszlo Somogyi, Andrea Zamponi, Harald Kiesow, Rainer Erhardt | 2013-02-12 |
| 5972050 | Dye mixtures containing polyazo dyes and CI Sulphur Black 1 dye | Matthias Wiesenfeldt, Johannes P. Dix, Manfred Herrmann, Gunther Lamm | 1999-10-26 |
| 5224963 | Quaternized condensation products for aftertreating dyed leather | Johannes P. Dix, Rolf Fikentscher, Ortwin Schaffer | 1993-07-06 |
| 4983185 | Dyeing of leather with pigments | Ortwin Schaffer, Horst Belde, Paul Guenthert | 1991-01-08 |
| 4936864 | Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather | Rolf Fikentscher, Dietrich Lach, Ortwin Schaffer, Alfred Oftring | 1990-06-26 |
| 4888412 | Tanning assistant | Klaus Ebel, Wolfgang Reuther, Rolf Fikentscher, Dietrich Lach, Ortwin Schaffer | 1989-12-19 |
| 4729768 | Deliming of hides and use of cyclic esters of sulfurous acid as deliming agents | Kurt Schneider, Dietrich Lach, Ortwin Schaffer | 1988-03-08 |
| 4675021 | Amphoteric condensates and their use in retanning | Dietrich Lach, Rainer Strickler | 1987-06-23 |
| 4596581 | Carboxyl- and amino-containing copolymer for after-tanning mineral tanned leather | Lothar Hohr, Dietrich Lach | 1986-06-24 |
| 4403993 | Preparation of water-soluble or self-dispersing resin tanning agents | Dietrich Lach, Gerhard Bolz | 1983-09-13 |
| 4377387 | Deliming hides | Erwin Hahn, Dietrich Lach, Kurt Schneider, Rainer Strickler | 1983-03-22 |
| 4322210 | Auxiliary, and process, for the soaking of hides | Erwin Hahn, Dietrich Lach | 1982-03-30 |
| 4272243 | Dyeing of grain leather | Dietrich Lach, Franz Feichtmayr | 1981-06-09 |