TREA

Sergei P. Efimenko

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  • Donetsk, SU
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of making billets
    • Patent number 4,288,907
    • Issue date Sep 15, 1981
    • Julian M. Chumanov
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Method of rolling section billets
    • Patent number 4,204,416
    • Issue date May 27, 1980
    • Julian M. Chumanov
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Method of refining of metal
    • Patent number 4,140,522
    • Issue date Feb 20, 1979
    • Leonid I. Krupman
    • C21 - METALLURGY OF IRON