Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6846956 | Triarylmethane dyes | Thomas Gessner, Rainer Tresch | 2005-01-25 | $393,000 |
| 6160169 | Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid | Rudolf Bermes, Armin Haag, Peter Krotzsch | 2000-12-12 | $247,000 |
| 5892105 | Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid | Rudolf Bermes, Armin Haag, Peter Krotzsch | 1999-04-06 | |
| 5073634 | Tetrachloroferrates of basic dyes | Johannes P. Dix, Guenter Hansen | 1991-12-17 | |
| 4976744 | Preparation of concentrated solutions of cationic dyes as mono-carboxylates in glycol ether | Johannes P. Dix, Guenter Hansen | 1990-12-11 | |
| 4223144 | Triphenylmethane dyes | Klaus Grychtol, Franz Feichtmayr | 1980-09-16 |