Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8978786 | System and method for adjusting roller cone profile on hybrid bit | Don Q. Nguyen, Anton F. Zahradnik, Rudolf Carl Pessier, Mark P. Blackman, Robert Bradshaw +4 more | 2015-03-17 |
| 8579050 | Reamer with balanced cutting structure for use in a wellbore | Rudolf Carl Pessier, Robert J. Buske, Mark P. Blackman, Gregory L. Ricks | 2013-11-12 |