Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880763 | Catalyst for production of hydrocarbons | Sigrid Eri, George Marcelin, Trygve Riis | 1989-11-14 |
| 4857559 | Process for production of hydrocarbons | Sigrid Eri | 1989-08-15 |
| 4801573 | Catalyst for production of hydrocarbons | Sigrid Eri, George Marcelin, Trygve Riis | 1989-01-31 |