Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7807836 | Preparation of perylen-3,4:9,10-tetracarboxylic dianhydride and also of naphtalene-1,8-dicarboximides | Felix Mueller, Arno Boehm, Willi Helfer, Volker Weyrauch, Georg Henning | 2010-10-05 |
| 7393956 | Method for the production of perylen-3,4:9,10-tetracarboxylic acid diimides and perylen-3,4:9,10-tetracarboxylic acid dianhydride and naphtalene-1,8-dicarboxylimides | Felix Mueller, Arno Boehm, Willi Helfer, Volker Weyrauch, Georg Henning | 2008-07-01 |
| 5445727 | Production of nickelized shaped articles | Volker Schwendemann, Klaus Glaser, Chung-Ji Tschang, Bernd Burkhart, Alfred Oftring | 1995-08-29 |
| 5421990 | Production of shining shaped articles coated with zinc or a zinc alloy | Erwin Hahn, Bernd Burkhart, Chung-Ji Tschang | 1995-06-06 |
| 5286401 | Use of heterocyclic compounds as bleach activators or optical brighteners in washing and cleaning agents | Wolfgang Trieselt, Erwin Hahn, Johannes Perner, Alfred Oftring | 1994-02-15 |