Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6481511 | Rotary drill bit | Nigel Dennis Griffin, Peter Raymond Hughes | 2002-11-19 |
| 6439327 | Cutting elements for rotary drill bits | Nigel Dennis Griffin | 2002-08-27 |
| 6435058 | Rotary drill bit design method | Nigel Dennis Griffin, Peter Raymond Hughes | 2002-08-20 |