Patents by Inventor Alexander Y. Vulchev

Alexander Y. Vulchev 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).

  • Graphite electrode with protective coating and method for its production
    Patent number: 4740990
    Abstract: A graphite electrode with protective coating, consisting of a single- or multilayer metallic or metal-oxide coating, and a graphite layer containing graphite, vinyl-acetate as binder and methyl cellulose as thickener, this surface layer being compacted by means of a pressure roller or a vibration tool.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: April 26, 1988
    Assignee: NPP PO Elektrotermia
    Inventors: Rumen B. Radev, Alexander Y. Vulchev, Vasil G. Peev
  • 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