Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5808142 | Process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid | Siegbert Rittner, Hans-Martin Ruffer, Jorg Schmid | 1998-09-15 |
| 5770752 | Process for reducing the concentration of by-products in product mixtures | Wilhelm Kaufmann, Johann Streb, Thomas Rink, Roland Zenk, Michael Riedel +1 more | 1998-06-23 |
| 5643494 | Process for the preparation of aromatic hydroxy carboxylic acids | Siegbert Rittner, Hans-Martin Ruffer, Jorg Schmid | 1997-07-01 |
| 5532406 | Process for preparing aromatic hydroxycarboxylic acids | Siegbert Rittner, Hans-Martin Ruffer, Jorg Schmid | 1996-07-02 |