Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8356398 | Modular hybrid drill bit | Ron D. McCormick, Don Q. Nguyen, Tim Marvel, Matthew R. Isbell, Anton F. Zahradnik +3 more | 2013-01-22 |
| 7841426 | Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit | Anton F. Zahradnik, Don Q. Nguyen, Michael S. Damschen, Karlos B. Cepeda, Tim Marvel +1 more | 2010-11-30 |
| 7621345 | High density row on roller cone bit | Karlos B. Cepeda, Robert J. Buske, James L. Overstreet | 2009-11-24 |