Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7347285 | Drilling machine having a movable rod handling device and a method for moving the rod handling device | — | 2008-03-25 |
| 5168937 | Drill feed control utilizing a variable overcenter valve | — | 1992-12-08 |
| 5033266 | Overcenter valve control system and method for drilling | — | 1991-07-23 |
| 4953639 | Closed loop hydraulic drill feed system | George P. Schivley, Jr. | 1990-09-04 |