Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6971458 | Drill bit | Djurre Hans Zijsling | 2005-12-06 |
| 6953098 | Hydraulic drill string accumulator | Djurre Hans Zijsling | 2005-10-11 |
PK
Petrus Cornelis Kriesels
Overall (2005): #39,520 of 245,428Top 20%
2
Patents 2005