Issued Patents 2019
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10519725 | Hydraulic multi-displacement hoisting cylinder system | Ronald Pettapiece | 2019-12-31 |
| 10415368 | Autodrilling system for control of operation of a hydraulic drilling rig | Ronald Pettapiece | 2019-09-17 |
| 10246951 | Hydraulic multi-displacement hoisting cylinder system | Ronald Pettapiece | 2019-04-02 |