Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5326441 | Process for separating and concentrating gallium from an aqueous solution containing gallium, together with aluminum, zinc and copper | Ioannis Kirgios, Wolfgang Degener | 1994-07-05 |
| 4981569 | Electric-field emulsion-breaking device | Wilfried Gutknecht | 1991-01-01 |
| 4904412 | Emulsion-forming composition | Wilfried Gutknecht | 1990-02-27 |
| 4777269 | 7-Phenylacetic acid-4-alkyl-coumarinyl amides useful in fluorometric determination of the activity of hydrolases | Thomas Scheper, Martina Weiss | 1988-10-11 |
| 4775479 | Process for selectively recovering Ge and as from aqueous solutions | Wilfried Gutknecht | 1988-10-04 |