Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883414 | Rotating piston compressor | — | 1989-11-28 |
| 4852614 | Shut-off device which can be inserted into a pipeline | Trond V. Johansen, Ola Ruch, Ludvig Naess, Robert A. Weber, Bernd Veenhoff +3 more | 1989-08-01 |