Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7543660 | Roller cone drill bit with debris diverter plugs | Michael B. Crawford, Mark E. Williams, Mark P. Blackman, Gerald L. Pruitt | 2009-06-09 |
| 7484572 | Roller cone drill bit with debris flow paths through associated support arms | Mark P. Blackman, Mark E. Williams, Michael B. Crawford, Gerald L. Pruitt, William W. King +1 more | 2009-02-03 |
| 6536192 | Drill bit packages and methods | William W. King, Jeffery Peck, James Dahlem, Karl Knecht, Lee Morgan Smith +3 more | 2003-03-25 |
| 6474424 | Rotary cone drill bit with improved bearing system | — | 2002-11-05 |
| 6415687 | Rotary cone drill bit with machined cutting structure and method | — | 2002-07-09 |
| 6390209 | Roller cone drill bit with improved pressure compensation | — | 2002-05-21 |
| 6311789 | Bit breakers, bits, systems, and methods with improved makeup/breakout engagement | — | 2001-11-06 |
| 6213228 | Roller cone drill bit with improved pressure compensation | — | 2001-04-10 |
| 6206116 | Rotary cone drill bit with machined cutting structure | — | 2001-03-27 |
| 6092611 | Encapsulated elastomeric relief valve | — | 2000-07-25 |
| 5456328 | Drill bit with improved rolling cutter tooth pattern | — | 1995-10-10 |
| 5429201 | Drill bit with improved rolling cutter tooth pattern | — | 1995-07-04 |
| 4760890 | Cutter assembly for rotary boring of earth | — | 1988-08-02 |
| 4509607 | Compressible pressure compensator within closed lubricant volume of an earth boring apparatus | Larry Parker | 1985-04-09 |
| 4258805 | Low cutter load raise head | — | 1981-03-31 |
| 4182422 | Large diameter bit with bridge mounted drive stem | Thomas Youngblood, Gerald F. Wilemon | 1980-01-08 |