Issued Patents All Time
Showing 51–56 of 56 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5501242 | Pressure relief valve | Graeme Forbes Coutts | 1996-03-26 |
| 5501272 | Multi-sensor relief valve well test system | Graeme Forbes Coutts | 1996-03-26 |
| 5484022 | Tubing test valve | Graeme Forbes Coutts | 1996-01-16 |
| 5259456 | Drill stem test tools | Ray Johns, Robert D. Buchanan | 1993-11-09 |
| 5222559 | Valves | Ray Johns, Robert D. Buchanan | 1993-06-29 |
| 5193619 | Well control apparatus | Ray Johns, Robert D. Buchanan | 1993-03-16 |