Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8981093 | Process for preparing piperazine | Roland Bou Chedid, Johann-Peter Melder, Ulrich Abel, Roman Dostalek, Nina Challand +1 more | 2015-03-17 |
| 8766010 | Method for distilling mixtures comprising ethylenediamine, N-methylethylenediamine, and water, and mixtures of ethylenediamine and N-methylethylenediamine having a low content of N-methylethylenediamine obtainable thereby | Jörg Pastre, Randolf Hugo | 2014-07-01 |
| 7931255 | Fabric packing | Rudiger Tushaus, Peter Rossler, Thorsten Friese | 2011-04-26 |
| 7758730 | Method for improving a piperazine colour stability | Holger Evers, Johann-Peter Melder, Gunther Van Cauwenberge, Jan Nouwen | 2010-07-20 |
| 7271292 | Process for distillatively removing piperazine from an ethylenediamine-piperazine mixture | Ortmund Lang, Gunther van Cauwenberge, Matthias Frauenkron | 2007-09-18 |