Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5342950 | Preparation of quinophthalone derivatives | Helmut Hoch | 1994-08-30 |
| 4950756 | Preparation of 1-nitroanthraquinone-2-carboxylic acid | Jochem Henkelmann, Helmut Hoch, Thomas-Michael Kahl, Walter Maier | 1990-08-21 |
| 4421931 | Preparation of anthranilic acid amides | Peter Tonne, Winfried Ludwig, Johannes Grimmer | 1983-12-20 |
| 4419519 | Continuous preparation of phthalimide | Johannes Grimmer | 1983-12-06 |
| 4328339 | Continuous preparation of isatoic anhydride | Johannes Grimmer, Peter Tonne, Hans Christoph Horn, Eckhard Hetzel | 1982-05-04 |
| 4276433 | Continuous preparation of anthranilic acid | Johannes Grimmer | 1981-06-30 |
| 4233459 | Continuous manufacture of anthranilic acid | Johannes Grimmer | 1980-11-11 |