Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9303458 | Method and system for radially expanding a tubular element | Petrus Cornelis Kriesels | 2016-04-05 |
| 6327539 | Method of determining drill string stiffness | Wouter Johannes Gregorius Keultjes | 2001-12-04 |
| 6166654 | Drilling assembly with reduced stick-slip tendency | — | 2000-12-26 |
| 5806611 | Device for controlling weight on bit of a drilling assembly | Djurre Hans Zijsling | 1998-09-15 |
| 4674010 | Capacitive submergible electrical connector apparatus | — | 1987-06-16 |