| 8356674 |
Tubular running tool and methods of use |
Richard Lee Murray, Jr., Pieter Dekker, Keith Mitchell Wien, Neils De Keijzer, Antonius Dimphena Maria Krijnen +3 more |
2013-01-22 |
| 7753138 |
Pipe running tool having internal gripper |
Daniel Juhasz, George I. Boyadjieff, Brian L. Eidem, Hans van Rijzingen, Herman M. Kamphorst +3 more |
2010-07-13 |
| 7699121 |
Pipe running tool having a primary load path |
Daniel Juhasz, George I. Boyadjieff, Brian L. Eidem, Hans van Rijzingen, Herman M. Kamphorst +3 more |
2010-04-20 |
| 7591304 |
Pipe running tool having wireless telemetry |
Daniel Juhasz, George I. Boyadjieff, Brian L. Eidem, Hans van Rijzingen, Herman M. Kamphorst +2 more |
2009-09-22 |
| 7510006 |
Pipe running tool having a cement path |
Daniel Juhasz, George I. Boyadjieff, Brian L. Eidem, Hans van Rijzingen, Herman M. Kamphorst +3 more |
2009-03-31 |
| 7287544 |
Triple valve blow out preventer |
Padmasiri Daya Seneviratne, Lawrence E. Wells |
2007-10-30 |
| 7121295 |
Internal blow out preventer ball and seat |
Padmasiri Daya Seneviratne, Lawrence E. Wells |
2006-10-17 |
| 6935204 |
Automated manual transmission and shift method |
Stuart J. Walker, David L. Dickrell |
2005-08-30 |
| 6915857 |
Non-seize material attachment for a drill slip system |
Johannes Wilhelmus Henricus van Rijzingen, Ronaldus Roling |
2005-07-12 |
| 6896048 |
Rotary support table |
Anton Krijnen, Rene Mulder |
2005-05-24 |
| 6845814 |
Pipe-gripping structure having load rings |
Albert Patrick Jozef Maria de Pont, Hans van Rijzingen, Anton Krijnen, Cornelis Wilhelmus Jacobus de Laat |
2005-01-25 |
| 6776070 |
Iron roughneck |
George I. Boyadjieff, Johannes Kamp, Ronaldus Roling |
2004-08-17 |
| 6758280 |
Non-seize material attachment for a drill slip system |
J. W. H. Van Rijzingen, Rosmalen R. Roling |
2004-07-06 |
| 5340182 |
Safety elevator |
Cornelis L. Busink, Johannes Wilhelmus Henricus van Rijzingen |
1994-08-23 |
