Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7977281 | Methods for minimizing the amount of graphite particles used during drilling operations | William S. Halliday, David Schwertner | 2011-07-12 |
| 7087555 | Drilling fluids comprising sized graphite particles | William S. Halliday, David Schwertner | 2006-08-08 |