Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9103185 | Valve with removable component | David Biddick, Geoffrey Pinard | 2015-08-11 |
| 8002040 | System and method for controlling flow in a wellbore | Dwayne May, David McCalvin, David Biddick, Russell A. Johnston | 2011-08-23 |
| 7779919 | Flapper valve retention method and system | David Biddick | 2010-08-24 |
| 7740075 | Pressure relief actuated valves | Russell A. Johnston | 2010-06-22 |