Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7530401 | Tool trap assembly and method | Douglas B. Leeth, John Lemke | 2009-05-12 |
| 7165635 | Deflection swivel and method | Vernon E. Kauffman, Douglass B. Leeth, John Lemke | 2007-01-23 |
| 7131497 | Articulated drillstring entry apparatus and method | Charles M. Helms, Vernon E. Kauffman, Douglas B. Leeth, John Lemke | 2006-11-07 |