Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8251147 | Method and apparatus for continuously injecting fluid in a wellbore while maintaining safety valve operation | Jeffrey L. Bolding, Don Sanders | 2012-08-28 |
| 7926574 | Fluid actuated circulating sub | George N. Krieg, David Hebert, David Robinson | 2011-04-19 |
| 7798235 | Safety valve torsional spring assembly and method | Robert Jancha, Robert C. Henschel | 2010-09-21 |
| 7766086 | Fluid actuated circulating sub | George N. Krieg, David Hebert, David Robinson | 2010-08-03 |
| 7520336 | Multiple dart drop circulating tool | George N. Krieg, David Hebert, David Robinson | 2009-04-21 |