Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5485890 | Rock bit | Chris E. Cawthorne, Steve Peterson, Madapusi K. Keshavan | 1996-01-23 |
| 4944774 | Hard facing for milled tooth rock bits | Madapusi K. Keshavan, Lance D. Underwood, Thomas W. Oldham, Cary A. Roth, Brian J. Armstrong | 1990-07-31 |
| 4907665 | Cast steel rock bit cutter cones having metallurgically bonded cutter inserts | William J. Salesky, Steven J. Guzowski | 1990-03-13 |
| 4869329 | Rock bit insert | Thomas W. Oldham | 1989-09-26 |
| 4836307 | Hard facing for milled tooth rock bits | Madapusi K. Keshavan, Lance D. Underwood, Thomas W. Oldham, Cary A. Roth, Brian J. Armstrong | 1989-06-06 |
| 4781770 | Process for laser hardfacing drill bit cones having hard cutter inserts | — | 1988-11-01 |