Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6322765 | Process for preparing silicon dioxide | Carl-Heinz Ehrke, Gerhard Kalchgruber, Botho Druse | 2001-11-27 |
| 5458916 | Hydrophobicization of pyrogenic silica | Gunter Kratel, Peter Scherm | 1995-10-17 |
| 5372795 | Process for hydrophobicizing of pyrogenic silica | Gunter Kratel, Peter Scherm | 1994-12-13 |
| 4565682 | Process for producing pyrogenic silicic acid with increased thickening effect | Stephen Loskot, Gunter Kratel, Wilfried Lang | 1986-01-21 |
| 4515762 | Process for processing waste gases resulting during the production of silicon | Rudolf Griesshammer, Franz Koppl, Winfried Lang, Michael Schwab | 1985-05-07 |