Issued Patents 2005
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6899186 | Apparatus and method of drilling with casing | David J. Brunnert | 2005-05-31 |
| 6857487 | Drilling with concentric strings of casing | David J. Brunnert | 2005-02-22 |
| 6854533 | Apparatus and method for drilling with casing | David J. Brunnert | 2005-02-15 |