Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8910730 | Cutting element | Nigel Dennis Griffin | 2014-12-16 |
| 7568534 | Dual-edge working surfaces for polycrystalline diamond cutting elements | Nigel Dennis Griffin, Andrew David Bell | 2009-08-04 |
| 6962214 | Rotary seal for directional drilling tools | Nigel Dennis Griffin, Mark Colebrook | 2005-11-08 |
| 6878447 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2005-04-12 |
| 6861137 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Nigel Dennis Griffin | 2005-03-01 |
| 6861098 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2005-03-01 |
| 6797326 | Method of making polycrystalline diamond with working surfaces depleted of catalyzing material | Nigel Dennis Griffin | 2004-09-28 |
| 6749033 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2004-06-15 |
| 6739214 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2004-05-25 |
| 6601662 | Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength | Terry R. Matthias, Nigel Dennis Griffin | 2003-08-05 |
| 6592985 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2003-07-15 |
| 6589640 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2003-07-08 |
| 6585064 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2003-07-01 |
| 6562462 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Nigel Dennis Griffin | 2003-05-13 |
| 6544308 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Nigel Dennis Griffin | 2003-04-08 |
| 6481511 | Rotary drill bit | Terry R. Matthias, Nigel Dennis Griffin | 2002-11-19 |
| 6435058 | Rotary drill bit design method | Terry R. Matthias, Nigel Dennis Griffin | 2002-08-20 |
| 6410085 | Method of machining of polycrystalline diamond | Nigel Dennis Griffin | 2002-06-25 |