Patents by Inventor Erkki A. Lajunen

Erkki A. Lajunen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for pneumatic feeding or additives into converters
    Patent number: 4676826
    Abstract: A method and apparatus for pneumatic feeding of additives along pipes from an additive silo to converters. The additive is allowed to flow into a dispatching device, a scale or a similar device in it stopping the entrance of the additive when the desired quantity of additive has arrived in the dispatching device. The dispatching device is pressurized thereafter by means of compressed air, by means of which the quantity of additive is fed via a pipe into the converters.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: June 30, 1987
    Inventors: Markku J. Jortikka, Eino H. Forss, Harry A. Heino, Erkki A. Lajunen, Erkki E. Putkonen, Toivo E. Julkunen, Timo Laurio
  • Electric furnace dome
    Patent number: 4491952
    Abstract: Electric furnace dome that is made especially of ceramic material and which has the necessary openings for at least electrodes and material feed, at which time the dome's center (2) inside of the tube systems (3) is cooled at least around the openings with the aid of spiral tube systems (5,7,8,9) whose tube systems (3,5,7,8,9) form a part of the dome's support system.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: January 1, 1985
    Assignee: Outokumpu Oy
    Inventors: Matti Honkaniemi, Martti Jankkila, Aimo Nurminen, Matias Virta, Veikko Iisakka, Helge Krogerus, Heikki Tuovinen, Tarmo Mantymaki, Erkki Lajunen