Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7987925 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Eric C. Sullivan, R. Keith Glasgow, Jr., Tu Tien Trinh, Paul J. Lutes | 2011-08-02 |
| 7946357 | Drill bit with a sensor for estimating rate of penetration and apparatus for using same | Tu Tien Trinh, Eric C. Sullivan | 2011-05-24 |