Issued Patents All Time
Showing 51–55 of 55 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5394952 | Core cutting rock bit | Roger Johns, Gilbert S. Tyner, Charles R. Muren | 1995-03-07 |
| 5362073 | Composite seal for rotary cone rock bits | Robert G. Upton, Michael F. Hooper, Jerry Pyka, Randy Johnston, Robert X. Chambers | 1994-11-08 |
| 5351770 | Ultra hard insert cutters for heel row rotary cone rock bit applications | Chris E. Cawthorne, Scott D. McDonough, Michael A. Siracki | 1994-10-04 |
| 5341890 | Ultra hard insert cutters for heel row rotary cone rock bit applications | Chris E. Cawthorne, Michael A. Siracki | 1994-08-30 |
| 5172779 | Radial crest insert | Michael A. Siracki, Chris E. Cawthorne, James C. Minikus | 1992-12-22 |