Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6164390 | Method of determining characteristics of a rotary drag-type drill bit | Andrew Murdock | 2000-12-26 |
| 6129161 | Rotary drill bits with extended bearing surfaces | Tom Scott Roberts | 2000-10-10 |