Issued Patents 2005
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
| 6861098 | Polycrystalline diamond partially depleted of catalyzing material | Nigel Dennis Griffin | 2005-03-01 |
| 6861137 | High volume density polycrystalline diamond with working surfaces depleted of catalyzing material | Nigel Dennis Griffin | 2005-03-01 |