Issued Patents All Time
Showing 26–42 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6227318 | Superhard material enhanced inserts for earth-boring bits | — | 2001-05-08 |
| 6199645 | Engineered enhanced inserts for rock drilling bits | Nathan R. Anderson, J. Daniel Belnap, Chris E. Cawthorne, Ronald K. Eyre, Madapusi K. Keshavan +2 more | 2001-03-13 |
| 6179296 | Dual functioning seal for rock bits | Chris E. Cawthorne, Sujian Huang, Zhigang Fang | 2001-01-30 |
| 6170830 | Dual functioning seal for rock bits | Chris E. Cawthorne, Sujian Huang, Zhigang Fang | 2001-01-09 |
| RE37006 | High flow weld-in nozzle sleeve for rock bits | James L. Larsen | 2001-01-02 |
| 5853055 | Rock bit with an extended center jet | Per Ivar Nese, Alan W. Lockstedt, Dennis Cisneros, Michael S. Oliver, Gary R. Portwood | 1998-12-29 |
| 5842701 | Dual functioning seal for rock bits | Chris E. Cawthorne, Sujian Huang, Zhigang Fang | 1998-12-01 |
| 5722499 | Multiple diamond layer polycrystalline diamond composite cutters | David Nguyen, Stephen G. Southland | 1998-03-03 |
| 5669459 | Nozzle retention system for rock bits | James L. Larsen | 1997-09-23 |
| 5538093 | High flow weld-in nozzle sleeve for rock bits | James L. Larsen | 1996-07-23 |
| 5494122 | Composite nozzles for rock bits | James L. Larsen, Thomas W. Oldham, Madapusi K. Keshavan | 1996-02-27 |
| 5421424 | Bowed out chisel insert for rock bits | Gary R. Portwood, James C. Minikus, Scott D. McDonough | 1995-06-06 |
| 5351770 | Ultra hard insert cutters for heel row rotary cone rock bit applications | Chris E. Cawthorne, Scott D. McDonough, Gary R. Portwood | 1994-10-04 |
| 5341890 | Ultra hard insert cutters for heel row rotary cone rock bit applications | Chris E. Cawthorne, Gary R. Portwood | 1994-08-30 |
| 5322138 | Chisel insert for rock bits | — | 1994-06-21 |
| 5172777 | Inclined chisel inserts for rock bits | James C. Minikus | 1992-12-22 |
| 5172779 | Radial crest insert | Gary R. Portwood, Chris E. Cawthorne, James C. Minikus | 1992-12-22 |