Issued Patents All Time
Showing 26–44 of 44 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7845435 | Hybrid drill bit and method of drilling | Rudolf Carl Pessier, Don Q. Nguyen, Michael S. Damschen, Karlos B. Cepeda, Tim Marvel +1 more | 2010-12-07 |
| 7841426 | Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit | Rolf Carl Pessier, Don Q. Nguyen, Michael S. Damschen, Karlos B. Cepeda, Tim Marvel +1 more | 2010-11-30 |
| 7741561 | Electrosmog shielding for cable conduit | — | 2010-06-22 |
| 7708090 | Excluder ring for earth-boring bit | Gregory L. Ricks, Gregory W. Peterson, Don Q. Nguyen, Chih Lin, Terry J. Koltermann | 2010-05-04 |
| 7600589 | Rotary drill bits | Eric C. Sullivan, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-10-13 |
| 7594454 | Methods of fabricating rotary drill bits | Eric C. Sullivan, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-09-29 |
| 7472764 | Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture | Eric C. Sullivan, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-01-06 |
| 7392862 | Seal insert ring for roller cone bits | Don Q. Nguyen, Ronny D. McCormick, Terry J. Koltermann, Michael J. Veasey | 2008-07-01 |
| 7387177 | Bearing insert sleeve for roller cone bit | Terry J. Koltermann, Don Q. Nguyen, Aaron J. Dick, Eric C. Sullivan, Scott Shiqiang Shu | 2008-06-17 |
| 6651756 | Steel body drill bits with tailored hardfacing structural elements | Robert J. Costo, Jr., James L. Overstreet, James L. Duggan, Russel S. Smith, Mark E. Morris | 2003-11-25 |
| 6374704 | Steel-tooth bit with improved toughness | Danny E. Scott, James L. Overstreet | 2002-04-23 |
| 6142249 | Earth-boring bit with improved bearing seal | Eric C. Sullivan, Chih Lin, Terry J. Koltermann, Scott Ray Schmidt | 2000-11-07 |
| 6026917 | Earth-boring bit with improved bearing seal | Eric C. Sullivan, Chih Lin, Terry J. Koltermann, Scott Ray Schmidt | 2000-02-22 |
| 5351771 | Earth-boring bit having an improved hard-faced tooth structure | — | 1994-10-04 |
| 5351769 | Earth-boring bit having an improved hard-faced tooth structure | Danny E. Scott, Rudolf Carl Pessier | 1994-10-04 |
| 5295549 | Mechanical lock to prevent seal ring rotation | George E. Dolezal, Douglas J. Clinkscales, Turlach Paul Boylan | 1994-03-22 |
| 4727942 | Compensator for earth boring bits | Edward M. Galle | 1988-03-01 |
| 4474249 | Kelly seal | John W. Stevens | 1984-10-02 |
| 4428687 | Floating seal for earth boring bit | — | 1984-01-31 |