Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4720568 | Basic colorants | Klaus Grychtol | 1988-01-19 |
| 4597912 | Basic colorants | Klaus Grychtol | 1986-07-01 |
| 4560745 | Preparation of dyes which contain sulfonic acid groups and have a low electrolyte content | Volkmar Weberndoerfer, Friedrich Brunnmueller, Rudolf Bermes | 1985-12-24 |