Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8299794 | Method for electromagnetic geophysical surveying of subsea rock formations | Svein Erling Johnstad | 2012-10-30 |
| 7982465 | Electromagnetic method on shallow water using a controlled source | Harald Westerdahl, Svein Erling Johnstad | 2011-07-19 |
| 7812611 | Shallow marine electromagnetic hydrocarbon prospecting | Svein Erling Johnstad | 2010-10-12 |