Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8534317 | Hydraulically controlled barrier valve equalizing system | Robert J. Dyer | 2013-09-17 |
| 8534361 | Multi-stage pressure equalization valve assembly for subterranean valves | Mark S. Megill | 2013-09-17 |
| 8371375 | Wireline run mechanically or hydraulically operated subterranean insert barrier valve and associated landing nipple | Ronald J. Garr | 2013-02-12 |
| 8261835 | Dual acting rod piston control system | John D. Lindemann | 2012-09-11 |