Patents by Inventor Otmar Krennrich

Otmar Krennrich 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).

  • Process for producing alkali metals in elemental form
    Patent number: 4725311
    Abstract: A process of producing alkali metal by a reduction of alkali metal compounds with metallic reducing agents, which is simplified and avoids corrosion of the reaction vessel and part thereof in that the reduction is effected with particulate magnesium in an organic solvent which under the conditions of the process is inert to the alkali metal to be produced. The reaction is effected at temperatures from 100.degree. to 300.degree. C. In an embodiment of the process the reduction is effected in the presence of an alcohol used as a reaction accelerator.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: February 16, 1988
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Otmar Krennrich, Gottfried Brendel, Wilfried Weiss
  • Method of recovering uranium oxide from alkaline sodium uranyl carbonate solutions
    Patent number: 4436704
    Abstract: A method of recovering uranium dioxide from a sodium uranyl carbonate solution obtained by the alkaline carbonate leaching of uranium ore in which a solution is reacted at a temperature above 130.degree. C. and at superatmospheric pressure with particular metallic iron. The precipitated UO.sub.2 is recovered from the solution.
    Type: Grant
    Filed: June 24, 1982
    Date of Patent: March 13, 1984
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Otmar Krennrich, Gottfried Brendel, Hartmut Pietsch