Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6851478 | Y-body Christmas tree for use with coil tubing | Michael James Cornelssen, Keith David Farquharson | 2005-02-08 |
| 6595278 | Assembly for locking a polished rod in a pumping wellhead | Abram Khazanovich, Irina Khazanovich | 2003-07-22 |
| 6457530 | Wellhead production pumping tree | Keith David Farquharson, Daniel J. Riddell | 2002-10-01 |
| 6260817 | Hydraulic blowout preventer assembly for production wellhead | Keith David Farquharson | 2001-07-17 |
| 6176466 | Composite pumping tree with integral shut-off valve | Keith David Farquharson | 2001-01-23 |
| 5921276 | Piston-type check valve with diffuser | Keith David Farquharson | 1999-07-13 |
| 5799730 | Wellhead casing hanger assembly | Abram Khazanovich, John Braben | 1998-09-01 |
| 5765813 | Wellhead production blowout preventer ram | Keith David Farquharson | 1998-06-16 |
| 5743332 | Integral wellhead assembly for pumping wells | Keith David Farquharson | 1998-04-28 |