Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4493719 | Method of separation by fractional crystallization from a liquid mixture | Klaus Wintermantel, Hugo Fuchs | 1985-01-15 |
| 4369327 | Preparation of phthalic anhydride | Wilhelm Schultz, Johannes E. Schmidt, Friedrich Wirth, Herwig Hoffmann, Bernhard Holzknecht +1 more | 1983-01-18 |