Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7360602 | Barrier orifice valve for gas lift | James Holt, Vic Arthur Randazzo, Walt R. Chapman | 2008-04-22 |
| 7228897 | Cement through side pocket mandrel | James Holt, Walter Chapman, Jeffrey L. Osselburn, Keith E. Lewis | 2007-06-12 |
| 6810955 | Gas lift mandrel | Brian A. Roth, Roger D. Hegdahl | 2004-11-02 |
| 5896924 | Computer controlled gas lift system | Michael A. Carmody, Robert Coon, Brian A. Roth, Terry R. Bussear, Bruce E. Weightman | 1999-04-27 |