Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4902828 | Recovery of aqueous glyoxylic acid solutions | Bernd Heida, Fritz Graf, Leopold Hupfer | 1990-02-20 |
| 4521632 | Purification of aqueous glyoxal solutions | Bernd Heida, Fritz Graf, Leopold Hupfer | 1985-06-04 |
| 4451654 | Conditioning of finely divided crude organic pigments | Fritz Graser | 1984-05-29 |
| 4368582 | Process for drying finely divided pigments | Fritz Graser | 1983-01-18 |