Issued Patents 2011
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8028770 | Conformal bearing for rock drill bit | Aaron J. Dick, Chih Lin, Terry J. Koltermann, Anton F. Zahradnik, Daniel E. Scott +4 more | 2011-10-04 |
| 7975779 | Threaded cone retention system for roller cone bits | Anton F. Zahradnik, Eric C. Sullivan, Terry J. Koltermann, Aaron J. Dick, Scott Shiqiang Shu | 2011-07-12 |
| 7905301 | Earth boring drill bits made from a low-carbon, high-molybdenum alloy | Carmel Zouheir El Hakam, Eric C. Sullivan, John F. Bradford | 2011-03-15 |
| 7861805 | Conformal bearing for rock drill bit | Aaron J. Dick, Chih Lin, Terry J. Kolterman, Anton F. Zahradnik, Dan E. Scott +4 more | 2011-01-04 |