Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9670736 | Hybrid drill bit | Anton F. Zahradnik, Ron D. McCormick, Rudolf Carl Pessier, Jack T. Oldham, Michael S. Damschen +3 more | 2017-06-06 |
| 8459378 | Hybrid drill bit | Anton F. Zahradnik, Ron D. McCormick, Rudolf Carl Pessier, Jack T. Oldham, Michael S. Damschen +3 more | 2013-06-11 |
| 7845435 | Hybrid drill bit and method of drilling | Anton F. Zahradnik, Rudolf Carl Pessier, Don Q. Nguyen, Michael S. Damschen, Karlos B. Cepeda +1 more | 2010-12-07 |
| 7841426 | Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit | Anton F. Zahradnik, Rolf Carl Pessier, Don Q. Nguyen, Michael S. Damschen, Karlos B. Cepeda +1 more | 2010-11-30 |