Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5923698 | Method of operating an arc furnace, and an arc furnace | Andreas Loebner, Jan Oelscher | 1999-07-13 |
| 5787109 | Furnace vessel for a DC arc furnace | — | 1998-07-28 |
| 5748666 | Method and furnace for treatment of ash | Karl-Hugo Andersson, Goran Wikstrom | 1998-05-05 |
| 5738823 | Meltdown apparatus | Goran Grimfjard, Erik Lassander, Gerhard Lempa | 1998-04-14 |
| 5719897 | Furnace vessel for a direct current arc furnace | Erik Lassander | 1998-02-17 |
| 5376911 | Choke coil | — | 1994-12-27 |
| 5317591 | Direct-current arc furnace | — | 1994-05-31 |
| 5274663 | Direct-current arc furnace plant | — | 1993-12-28 |
| 5237585 | Direct-current arc furnace having circumferential zones of varying conductivity | — | 1993-08-17 |
| 5173920 | Direct-current electric-arc furnace | Walter Bochsler, Ante Eterovic | 1992-12-22 |
| 5134628 | Direct-current arc furnace having bottom electrodes with bath agitation electromagnet | — | 1992-07-28 |
| 4853941 | D.C. arc furnace having electrically conductive hearth and method for making same | Bo Rappinger | 1989-08-01 |
| 4701931 | Electrically conductive bricks | Bo Rappinger | 1987-10-20 |
| 4618963 | Direct current arc furnace | Bo Rappinger | 1986-10-21 |
| 4612650 | DC arc furnace | — | 1986-09-16 |
| 4606055 | DC arc furnace having starting equipment | Erik Lassander | 1986-08-12 |
| 4577326 | DC Arc furnace hearth connection | Kjell Bergman | 1986-03-18 |
| 4550413 | Symmetrical current conductor system for a DC arc furnace | Erik Lassander | 1985-10-29 |
| 4541099 | DC Arc furnace improved hearth construction | Bo Rappinger | 1985-09-10 |
| 4532633 | DC arc furnace improved hearth construction | — | 1985-07-30 |
| 4528673 | Ladle furnace with DC heating | — | 1985-07-09 |
| 4468782 | Method and device for operating a DC arc furnace | — | 1984-08-28 |
| 4442526 | Electric arc furnace arcing electrode seal | Bo Rappinger | 1984-04-10 |
| 4435813 | DC Arc furnace component | — | 1984-03-06 |
| 4425659 | Metal oxide reduction furnace | — | 1984-01-10 |