Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7802638 | Drive system | Andrew McPherson Downie | 2010-09-28 |
| 7416034 | Drive system | Andrew McPherson Downie | 2008-08-26 |
| 7204326 | Drilling turbine | Andrew McPherson Downie, Edward D. Scott | 2007-04-17 |