Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8931555 | Device for a downhole apparatus for machining of casings and also a method of depositing machined shavings | Helge Krohn | 2015-01-13 |
| 8844616 | Method for withdrawal and insertion of a drill pipe string in a borehole and also a device for use when practicing the method | Helge Krohn | 2014-09-30 |
| 8794351 | Device and method for drilling with continuous tool rotation and continuous drilling fluid supply | Helge Krohn, Odd B. Skjaerseth | 2014-08-05 |
| 8726984 | Rotary table device for a pipe string | Helge Krohn, Ove Kalvatn, Odd B. Skjaerseth | 2014-05-20 |
| 8651200 | Tool guide device for a drill floor | Helge Krohn, Odd B. Skjaerseth, Ove Kalvatn, Jarle Veshovde | 2014-02-18 |