Issued Patents All Time
Showing 1–25 of 44 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8910730 | Cutting element | Peter Raymond Hughes | 2014-12-16 |
| 7568534 | Dual-edge working surfaces for polycrystalline diamond cutting elements | Peter Raymond Hughes, Andrew David Bell | 2009-08-04 |
| 6962214 | Rotary seal for directional drilling tools | Peter Raymond Hughes, Mark Colebrook | 2005-11-08 |
| 6878447 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2005-04-12 |
| 6861137 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Peter Raymond Hughes | 2005-03-01 |
| 6861098 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2005-03-01 |
| 6797326 | Method of making polycrystalline diamond with working surfaces depleted of catalyzing material | Peter Raymond Hughes | 2004-09-28 |
| 6749033 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2004-06-15 |
| 6739214 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2004-05-25 |
| 6601662 | Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength | Terry R. Matthias, Peter Raymond Hughes | 2003-08-05 |
| 6592985 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2003-07-15 |
| 6589640 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2003-07-08 |
| 6585064 | Polycrystalline diamond partially depleted of catalyzing material | Peter Raymond Hughes | 2003-07-01 |
| 6562462 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Peter Raymond Hughes | 2003-05-13 |
| 6544308 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Peter Raymond Hughes | 2003-04-08 |
| 6517902 | Methods of treating preform elements | Eric F. Drake, Harold A. Sreshta | 2003-02-11 |
| 6481511 | Rotary drill bit | Terry R. Matthias, Peter Raymond Hughes | 2002-11-19 |
| 6439327 | Cutting elements for rotary drill bits | Terry R. Matthias | 2002-08-27 |
| 6435058 | Rotary drill bit design method | Terry R. Matthias, Peter Raymond Hughes | 2002-08-20 |
| 6410085 | Method of machining of polycrystalline diamond | Peter Raymond Hughes | 2002-06-25 |
| 6269894 | Cutting elements for rotary drill bits | — | 2001-08-07 |
| 6248447 | Cutting elements and methods of manufacture thereof | Malcolm R. Taylor | 2001-06-19 |
| 6145607 | Preform cutting elements for rotary drag-type drill bits | Terry R. Matthias | 2000-11-14 |
| 6142250 | Rotary drill bit having moveable formation-engaging members | John M. Fuller, Alex Newton, Malcolm R. Taylor, Andrew Murdock, Steven J. Taylor | 2000-11-07 |
| 6131678 | Preform elements and mountings therefor | — | 2000-10-17 |