Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE36066 | Use of selected ester oils in drilling fluids and muds | Heinz Mueller, Claus-Peter Herold, Stephan von Tapavicza, Douglas J. Grimes, Stuart Paul Smith | 1999-01-26 |
| 5252554 | Drilling fluids and muds containing selected ester oils | Heinz Mueller, Claus-Peter Herold, Stephan von Tapavicza, Douglas J. Grimes, Stuart Paul Smith | 1993-10-12 |
| 5232910 | Use of selected ester oils in drilling fluids and muds | Heinz Mueller, Claus-Peter Herold, Stephan von Tapavicza, Douglas J. Grimes, Stuart Paul Smith | 1993-08-03 |