Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10167688 | Method of disconnecting a drill string at a drill rig | Johan Jelgert, Per Vilen, Kent Evermark | 2019-01-01 |
| 9745806 | Drill rod gripping apparatus | Johan Jelgert, Krister B Eriksson, Ola FREDIN | 2017-08-29 |
| 9650849 | Drilling rig rod handling apparatus | Johan Jelgert, Per Vilen, Kent Evermark | 2017-05-16 |
| 5722355 | Twin-piston engine | Roy Ekdahl | 1998-03-03 |
| 5435590 | Means for limiting the steering movement of a vehicle | — | 1995-07-25 |
| 4862865 | Insulation material and method of applying the same to a component in a combustion engine | Lars Dahlén, Bo L. A. Othzen | 1989-09-05 |
| 4749051 | Drill steel | — | 1988-06-07 |
| 4622665 | Synchronizing system | Stig R. E. Jonsson | 1986-11-11 |
| 4607712 | Rock drill bit | — | 1986-08-26 |
| 4540200 | Rock drill | — | 1985-09-10 |
| 4304312 | Percussion drill bit having centrally projecting insert | — | 1981-12-08 |
| 4296825 | Rock drill | — | 1981-10-27 |