Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867229 | Method and means for applying a heat exchanger in a drill hole for the purpose of heat recovery or storage | — | 1989-09-19 |
| 4715429 | Method and means for applying a heat exchanger in a drill hole for the purpose of heat recovery or storage | — | 1987-12-29 |
| 4543470 | Means for electrically heating gases | Sven Santen, Mats Kaij, Jan Thornblom | 1985-09-24 |