Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9988854 | Roller cone drill bit with improved erosion resistance | Matthew Charles Stroever | 2018-06-05 |
| 8752655 | Rock bit having a labyrinth seal/bearing protection structure | — | 2014-06-17 |
| 8746374 | Method and apparatus for reducing lubricant pressure pulsation within a rotary cone rock bit | David Harrington, Xiaobin Lu | 2014-06-10 |
| 8534389 | Method and apparatus for reducing lubricant pressure pulsation within a rotary cone rock bit | David Michel Harrington | 2013-09-17 |
| 8403079 | Rock bit having a seal gland with a conical sealing surface | David Michel Harrington | 2013-03-26 |
| 8393418 | Rock bit having a seal gland with a conical sealing surface | David Michel Harrington | 2013-03-12 |
| 7971660 | Rock bit with a thermal insulating seal ring positioned in the seal gland | — | 2011-07-05 |
| 7832505 | Rock bit with a thermal insulating seal ring positioned in the seal gland | — | 2010-11-16 |
| 7721827 | Rock bit having a seal gland with a conical sealing surface | David Harrington | 2010-05-25 |