Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852391 | Pipeline vehicle | Ola Ruch, Trond V. Johansen, Ludvig Naess, Horst Poerner, Robert A. Weber +1 more | 1989-08-01 |
| 4832936 | Process for making calcium sulfate dihydrate or gypsum | Heinz Holter | 1989-05-23 |