Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7681636 | Pipe expander | Serge Mathieu Roggeband, Antonius Leonardus Maria Wubben | 2010-03-23 |
| 7474221 | Marking of pipe joints | Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis | 2009-01-06 |
| 7467671 | Drill bit with protection member | Jean-Michel Claude Gaston Savignat | 2008-12-23 |
| 7464774 | Drill bit and system for drilling a borehole | Jean-Michel Claude Gaston Savignat | 2008-12-16 |
| 7451811 | Expanding a tubular element to different inner diameters | Wilhelmus Christianus Maria Lohbeck, Paul Dirk Schilte | 2008-11-18 |
| 7389822 | Expander system for incremental expansion of a tubular element | Wilhelmus Christianus Maria Lohbeck | 2008-06-24 |
| 7383900 | Drill bit and system for drilling a borehole | — | 2008-06-10 |
| 7360604 | Expander system for stepwise expansion of a tubular element | Wilhelmus Christianus Maria Lohbeck | 2008-04-22 |
| 7282663 | Forge welding process | Robert Andrew Alford, Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Michalakis Efthymiou +3 more | 2007-10-16 |
| 7252162 | Method and device for injecting a fluid into a formation | Monsuru Olatunji Akinlade, Dirk Ligthelm | 2007-08-07 |
| 7181821 | Joining expandable tubulars | Mark Wilson Anderson, Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Jan Erik Vollebregt | 2007-02-27 |
| 7104344 | Percussion drilling head | Petrus Cornelis Kriesels | 2006-09-12 |
| 6971458 | Drill bit | Petrus Cornelis Kriesels | 2005-12-06 |
| 6953098 | Hydraulic drill string accumulator | Petrus Cornelis Kriesels | 2005-10-11 |
| 6371211 | Method of creating a weld in a wellbore | Wilhelmus Hubertus Paulus Maria Heijnen | 2002-04-16 |
| 6176313 | Method and tool for fracturing an underground formation | Josef Guillaume Christoffel Coenen, Cornelis Jan Kenter | 2001-01-23 |
| 5806611 | Device for controlling weight on bit of a drilling assembly | Leon Van Den Steen | 1998-09-15 |
| 5197554 | Rotary drill bit for drilling through sticky formations | — | 1993-03-30 |
| 5174391 | Tubular element for use in a rotary drilling assembly and method | — | 1992-12-29 |
| 4926950 | Method for monitoring the wear of a rotary type drill bit | — | 1990-05-22 |
| 4854399 | Tubular element for use in a rotary drilling assembly | — | 1989-08-08 |
| 4844180 | Downhole drilling motor | — | 1989-07-04 |
| 4830124 | Rotary drill bit | — | 1989-05-16 |
| 4792001 | Rotary drill bit | — | 1988-12-20 |
| 4624330 | Rotary drill bit with strainer element | — | 1986-11-25 |