Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7504010 | Anode for electrolysis of aluminum | Georg Frommeyer, Kai Johansen, Donald R. Sadoway, Gro Soleng, Elke William Thisted | 2009-03-17 |
| 6980580 | Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace | Jon Brinch, Kai Johansen | 2005-12-27 |
| 6811677 | Electrolytic cell for the production of aluminum and a method for maintaining a crust on a sidewall and for recovering electricity | Kai Johansen, Per Olav Nos | 2004-11-02 |
| 6805723 | Method and reactor for production of aluminum by carbothermic reduction of alumina | Kai Johansen | 2004-10-19 |
| 6440193 | Method and reactor for production of aluminum by carbothermic reduction of alumina | Kai Johansen | 2002-08-27 |
| 5196047 | Method of treatment of zinc-containing by-products and waste materials | — | 1993-03-23 |
| 5188658 | Method for recovering zinc from zinc-containing waste materials | Inger J. Eikeland, Thor Pedersen | 1993-02-23 |
| 5004496 | Method and apparatus for treatment of dust recovered from off gases in metallurgical processes | Thor Pedersen | 1991-04-02 |
| 4957551 | Method for treatment of dust recovered from off gases in metallurgical processes | Thor Pedersen | 1990-09-18 |
| 4831943 | Treating ash and dust from incineration plants by coprocessing with hazardous waste and/or metallic scrap | — | 1989-05-23 |
| 4696457 | Means for charging liquid slag to a closed smelting furnace | Knut Evensen | 1987-09-29 |
| 4674728 | Sidewall for a metallurgical smelting furnace | Per Olav Nos | 1987-06-23 |
| 4593886 | Method for charging liquid slag to a closed smelting furnace | Knut Evensen | 1986-06-10 |