Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6395853 | Water-soluble copolymers and their use for exploration and production of petroleum and natural gas | Reinhard J. Oswald, Roman Morschhäuser, Karl Heinz Heier, Juergen Tonhauser, Christoph Kayser +1 more | 2002-05-28 |
| 6380137 | Copolymers and their use as drilling aids | Karl Heinz Heier, Roman Morschhäuser, Susanne Weber, Gernold Botthof | 2002-04-30 |