Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6806235 | Lubricants for drilling fluids | Heinz Mueller, Frank Bongardt, Nadja Herzog, Stephan von Tapavicza | 2004-10-19 |
| 6716799 | Use of selected fatty alcohols and their mixtures with carboxylic acid esters as lubricant components in water-based drilling fluid systems for soil exploration | Heinz Mueller, Stephan von Tapavicza | 2004-04-06 |