Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6173797 | Rotary drill bits for directional drilling employing movable cutters and tandem gage pad arrangement with active cutting elements and having up-drill capability | James A. Norris, Christopher C. Beuershausen, Rudolf Carl Pessier | 2001-01-16 |
| 6006845 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability | Roland Illerhaus, Christopher C. Beuershausen, James A. Norris, Michael P. Ohanian, Rudolf Carl Pessier +1 more | 1999-12-28 |