Issued Patents 2011
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8028770 | Conformal bearing for rock drill bit | Chih Lin, Terry J. Koltermann, Anton F. Zahradnik, Daniel E. Scott, Don Q. Nguyen +4 more | 2011-10-04 |
| 7975779 | Threaded cone retention system for roller cone bits | Anton F. Zahradnik, Don Q. Nguyen, Eric C. Sullivan, Terry J. Koltermann, Scott Shiqiang Shu | 2011-07-12 |
| 7946768 | Bearing apparatuses, systems including same, and related methods | Craig H. Cooley | 2011-05-24 |
| 7861805 | Conformal bearing for rock drill bit | Chih Lin, Terry J. Kolterman, Anton F. Zahradnik, Dan E. Scott, Don Q. Nguyen +4 more | 2011-01-04 |