Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5296531 | Pigment preparations | Horst Belde, Manfred Herrmann, Franz Leppmeier | 1994-03-22 |
| 4936864 | Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather | Rolf Fikentscher, Ortwin Schaffer, Rolf Streicher, Alfred Oftring | 1990-06-26 |
| 4908239 | Finishing of leather | Guenter Eckert, Werner Maltry, Karl Fischer | 1990-03-13 |
| 4888412 | Tanning assistant | Klaus Ebel, Wolfgang Reuther, Rolf Fikentscher, Rolf Streicher, Ortwin Schaffer | 1989-12-19 |
| 4729768 | Deliming of hides and use of cyclic esters of sulfurous acid as deliming agents | Kurt Schneider, Rolf Streicher, Ortwin Schaffer | 1988-03-08 |
| 4675021 | Amphoteric condensates and their use in retanning | Rolf Streicher, Rainer Strickler | 1987-06-23 |
| 4629616 | Basic chromium aluminum sulfates and their preparation | Werner Ostertag, Henning Wienand, Erwin Hahn | 1986-12-16 |
| 4596581 | Carboxyl- and amino-containing copolymer for after-tanning mineral tanned leather | Lothar Hohr, Rolf Streicher | 1986-06-24 |
| 4563520 | Metal complexes of dis- or trisazo compounds containing a middle component twice substituted by hydroxy and/or amino | Udo Bergmann, Guenter Hansen, Georg Zeidler | 1986-01-07 |
| 4491543 | Dis-, tris-, and tetrakisazo compounds containing resorcinol, sulfonylamino, and two or three sulfonic acid groups | Udo Bergmann, Guenter Hansen, Michael Thomas, Georg Zeidler | 1985-01-01 |
| 4474695 | Complex dye mixture containing at least two cobalt 1:2 complexes of azo dyes | Klaus Grychtol | 1984-10-02 |
| 4403993 | Preparation of water-soluble or self-dispersing resin tanning agents | Rolf Streicher, Gerhard Bolz | 1983-09-13 |
| 4390340 | Tanning agent, its preparation and its use for retanning | — | 1983-06-28 |
| 4377387 | Deliming hides | Erwin Hahn, Kurt Schneider, Rainer Strickler, Rolf Streicher | 1983-03-22 |
| 4322210 | Auxiliary, and process, for the soaking of hides | Erwin Hahn, Rolf Streicher | 1982-03-30 |
| 4272243 | Dyeing of grain leather | Rolf Streicher, Franz Feichtmayr | 1981-06-09 |
| 4213760 | Deliming of hides | Erwin Hahn, Bernhard Magerkurth, Lothar Wuertele | 1980-07-22 |