Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6415878 | Steerable rotary drilling device | Elis Vandenberg | 2002-07-09 |
| 6340063 | Steerable rotary directional drilling method | Laurier E. Comeau, Elis Vandenberg, John Hardin, Terrance Dean Maxwell, Bryan James Restau +3 more | 2002-01-22 |