Issued Patents 2002
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6455474 | High performance environmentally friendly, low temperature, drilling fluids | Robert J. Wittenbrink, Daniel Francis Ryan, Bruce R. Cook | 2002-09-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6455474 | High performance environmentally friendly, low temperature, drilling fluids | Robert J. Wittenbrink, Daniel Francis Ryan, Bruce R. Cook | 2002-09-24 |