Patents by Inventor Leonid W. Ronkow

Leonid W. Ronkow 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).

  • Apparatus for the extraction of metals from metal-containing raw materials
    Patent number: 5314171
    Abstract: Metal-containing ores are extracted by a process and apparatus which avoid contaminating the product with fuel gas components. In a rotary kiln, a heat shock-resistant ceramic pipe is subjected to indirect high temperature heating, thereby allowing the extraction reaction to be conducted without heat producing fuel gases.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: May 24, 1994
    Assignee: Osaka Fuji Corporation
    Inventors: Hans A. Friedrichs, Leonid W. Ronkow
  • Method and apparatus for the extraction of metals from metal-containing raw materials
    Patent number: 5261943
    Abstract: Metal-containing ores are extracted by a process and apparatus which avoid contaminating the product with fuel gas components. In a rotary kiln, a heat shock-resistant ceramic pipe is subjected to indirect high temperature heating, thereby allowing the extraction reaction to be conducted without heat producing fuel gases.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: November 16, 1993
    Assignee: Vereinigte Aluminium-Werke A.G.
    Inventors: Hans A. Friedrichs, Leonid W. Ronkow