Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853941 | D.C. arc furnace having electrically conductive hearth and method for making same | Sven-Einar Stenkvist | 1989-08-01 |
| 4701931 | Electrically conductive bricks | Sven-Einar Stenkvist | 1987-10-20 |
| 4618963 | Direct current arc furnace | Sven-Einar Stenkvist | 1986-10-21 |
| 4541099 | DC Arc furnace improved hearth construction | Sven-Einar Stenkvist | 1985-09-10 |
| 4442526 | Electric arc furnace arcing electrode seal | Sven-Einar Stenkvist | 1984-04-10 |
| 4324943 | DC Arc furnace hearth construction | Sven-Einar Stenkvist | 1982-04-13 |