Patents by Inventor Ivan K. Ivanov

Ivan K. Ivanov 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).

  • Seal for an electrode hole in an electric arc furnace
    Patent number: 4703493
    Abstract: A sealing device which comprises a refractory portion consisting of high-alumina material with an Al.sub.2 O.sub.3 content higher than 80%. The internal portion of the sealing device is made up of refractory cement with an Al.sub.2 O.sub.3 content higher than 80% which is cast and vibrated in a mould formed by a cylinder-shaped metallic part of the device and an internal fixed template. After the setting of the refractory cement, the internal templet is drawn out and the device, comprising a metallic and a refractory portion, is subjected to drying. This is effected at 150.degree. C.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: October 27, 1987
    Assignee: Npp Po Elektrotermia
    Inventors: Nikolay G. Bakalov, Penyo I. Penev, Ivan K. Ivanov, Velyo T. Velev, Peter H. Savov, Alexander Y. Vulchev