Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7921926 | Jointed spearhead assembly | Christopher L. Drenth, Anthony Lachance | 2011-04-12 |
| 7900716 | Vibratory unit for drilling systems | Christopher L. Drenth, Anthony Lachance | 2011-03-08 |