Issued Patents All Time
Showing 51–75 of 91 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8056651 | Adaptive control concept for hybrid PDC/roller cone bits | Evan C. Turner | 2011-11-15 |
| 8028770 | Conformal bearing for rock drill bit | Aaron J. Dick, Chih Lin, Terry J. Koltermann, Anton F. Zahradnik, Daniel E. Scott +4 more | 2011-10-04 |
| 8006785 | Casing and liner drilling bits and reamers | Jack T. Oldham, L. Allen Sinor, Eric E. McClain, Robert A. Laing, Evan C. Turner +1 more | 2011-08-30 |
| 7987925 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Daryl L. Pritchard, R. Keith Glasgow, Jr., Tu Tien Trinh, Paul J. Lutes | 2011-08-02 |
| 7975779 | Threaded cone retention system for roller cone bits | Anton F. Zahradnik, Don Q. Nguyen, Terry J. Koltermann, Aaron J. Dick, Scott Shiqiang Shu | 2011-07-12 |
| 7954380 | Rotary drill bits and systems for inspecting rotary drill bits | Jeffrey B. Lund, Nicholas J. Lyons, Terry D. Watts | 2011-06-07 |
| 7946357 | Drill bit with a sensor for estimating rate of penetration and apparatus for using same | Tu Tien Trinh, Daryl L. Pritchard | 2011-05-24 |
| 7905301 | Earth boring drill bits made from a low-carbon, high-molybdenum alloy | Carmel Zouheir El Hakam, John F. Bradford, Don Q. Nguyen | 2011-03-15 |
| 7861805 | Conformal bearing for rock drill bit | Aaron J. Dick, Chih Lin, Terry J. Kolterman, Anton F. Zahradnik, Dan E. Scott +4 more | 2011-01-04 |
| 7861806 | Shank structure for rotary drill bits | Anton F. Zahradnik, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2011-01-04 |
| 7849934 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Daryl L. Pritchard, Keith Glasgow, Tu Tien Trinh, Paul J. Lutes | 2010-12-14 |
| 7836792 | System, method and apparatus for enhanced cutting element retention and support in a rock bit | Tu Tien Trinh | 2010-11-23 |
| 7823664 | Corrosion protection for head section of earth boring bit | Alan J. Massey, David K. Luce, John F. Bradford, Carmel Zouheir El Hakam, James L. Overstreet +1 more | 2010-11-02 |
| 7631560 | Methods of inspecting rotary drill bits | Jeffrey B. Lund, Nicholas J. Lyons, Terry D. Watts | 2009-12-15 |
| 7621346 | Hydrostatic bearing | Tu Tien Trinh | 2009-11-24 |
| 7604072 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Daryl L. Pritchard, Keith Glasgow, Tu Tien Trinh, Paul J. Lutes | 2009-10-20 |
| 7600589 | Rotary drill bits | Anton F. Zahradnik, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-10-13 |
| 7594454 | Methods of fabricating rotary drill bits | Anton F. Zahradnik, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-09-29 |
| 7510026 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Daryl L. Pritchard, Keith Glasgow, Tu Tien Trinh, Paul J. Lutes | 2009-03-31 |
| 7506695 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Daryl L. Pritchard, Keith Glasgow, Tu Tien Trinh, Paul J. Lutes | 2009-03-24 |
| 7497276 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Daryl L. Pritchard, Keith Glasgow, Tu Tien Trinh, Paul J. Lutes | 2009-03-03 |
| 7472764 | Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture | Anton F. Zahradnik, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-01-06 |
| 7395882 | Casing and liner drilling bits | Jack T. Oldham, L. Allen Sinor, Eric E. McClain, Robert A. Laing, Evan C. Turner +1 more | 2008-07-08 |
| 7387177 | Bearing insert sleeve for roller cone bit | Anton F. Zahradnik, Terry J. Koltermann, Don Q. Nguyen, Aaron J. Dick, Scott Shiqiang Shu | 2008-06-17 |
| 7241049 | Micropore engagement surfaces for earth boring bit | Chih Lin | 2007-07-10 |