Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5722497 | Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces | Robert C. Gum, Thomas M. Dennis | 1998-03-03 |
| 5291807 | Patterned hardfacing shapes on insert cutter cones | Alan D. Huffstutler | 1994-03-08 |
| 4199856 | Method of providing lubricant volume displacement system for a rotary rock bit | James T. Farrow, Ernest E. Taylor | 1980-04-29 |
| 4181185 | Thrust flange actuated rock bit lubrication system | Wilbur S. Keller | 1980-01-01 |