Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6782952 | Hydraulic stepping valve actuated sliding sleeve | Edward Zisk, Brian A. Roth | 2004-08-31 |
| 6722439 | Multi-positioned sliding sleeve valve | Jeffry S. Edwards, Michael A. Carmody | 2004-04-20 |