Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4944774 | Hard facing for milled tooth rock bits | Madapusi K. Keshavan, Lance D. Underwood, Naresh J. Kar, Thomas W. Oldham, Cary A. Roth | 1990-07-31 |
| 4836307 | Hard facing for milled tooth rock bits | Madapusi K. Keshavan, Lance D. Underwood, Naresh J. Kar, Thomas W. Oldham, Cary A. Roth | 1989-06-06 |