Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9670736 | Hybrid drill bit | Anton F. Zahradnik, Rudolf Carl Pessier, Jack T. Oldham, Michael S. Damschen, Don Q. Nguyen +3 more | 2017-06-06 |
| 8459378 | Hybrid drill bit | Anton F. Zahradnik, Rudolf Carl Pessier, Jack T. Oldham, Michael S. Damschen, Don Q. Nguyen +3 more | 2013-06-11 |
| 8356398 | Modular hybrid drill bit | Rolf Carl Pessier, Don Q. Nguyen, Tim Marvel, Matthew R. Isbell, Anton F. Zahradnik +3 more | 2013-01-22 |