Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5514331 | Method and device for producing stainless steel | Veikko Juntunen, Jorma Kemppainen, Risto Pellikka, Eero Rattya | 1996-05-07 |
| 4995051 | Smelting furnace and method for feeding material to be processed therein | Nils H. Hakulin, Risto M. Heikkila, Helge Krogerus, Launo L. Lilja | 1991-02-19 |
| 4740239 | Process for exploitation of low grade oxidic and iron-bearing complex ores or concentrates | Frans H. Tuovinen, Seppo Heimala, Stig-Erik Hultholm, Risto J. Honkala, Helge Krogerus | 1988-04-26 |
| 4708640 | Apparatus for batch preparation and feeding into the smelting process | Lauri A. Mustikka, Martti Jankkila, Pentti O. Hokkanen, Risto M. Heikkila, Launo L. Lilja | 1987-11-24 |
| 4705474 | Method and apparatus for batch preparation and feeding into the smelting process | Lauri A. Mustikka, Martti Jankkila, Pentti O. Hokkanen, Risto M. Heikkila, Launo L. Lilja | 1987-11-10 |
| 4622677 | Method and device for clamping the electrode contact shoes around the electrode of an electric furnace | Heikki Tuovinen, Kauko K. Rinne, Risto M. Heikkila, Martti Jankkila | 1986-11-11 |
| 4580272 | Method for controlling and balancing the power in an electric furnace | Teuvo M. Hyvarinen, Paavo Raukko | 1986-04-01 |
| 4491952 | Electric furnace dome | Martti Jankkila, Aimo Nurminen, Matias Virta, Veikko Iisakka, Helge Krogerus +3 more | 1985-01-01 |
| 4478802 | Method for cleaning cyanide-bearing gas scrubbing waters produced in metallurgical industry | Veikko Juntunen, Veli Keinanen, Urpo J. Mansikka | 1984-10-23 |
| 4464764 | Device for moving solid material fed onto the surface of a melt and for breaking a slag crust formed on the surface of the melt or inside the charge | Frans H. Tuovinen, Bengt F. Norrman, Risto M. Heikkila | 1984-08-07 |
| 4458352 | Method and device providing mobility to a contact shoe independent of an electrode in an electric-arc furnace | Frans H. Tuovinen, Risto M. Heikkila, Martti Jankkila, Bengt J. F. Norrman | 1984-07-03 |
| 4222786 | Ferrochromium slag for uses requiring refractoriness and mechanical strength | Frans H. Tuovinen, Matias Virta, Helge Krogerus | 1980-09-16 |
| 4211553 | Method of refining of melts by means of a pulverous solid material and/or a gas | Helge Krogerus, Launo L. Lilja, Juho K. Makinen, John Henrik Relander, Frans H. Tuovinen | 1980-07-08 |