Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7748473 | Top drives with shaft multi-seal | Lawrence E. Wells, Preston R. Fox, Cliff Swiontek, Howard Ervin, James D. Brugman +1 more | 2010-07-06 |
| 7487848 | Multi-seal for top drive shaft | Larry Wells, Howard Ervin, James D. Brugman, Paul Conover | 2009-02-10 |
| 7401664 | Top drive systems | Lawrence E. Wells, Preston R. Fox, Cliff Swiontek | 2008-07-22 |