Patents by Inventor Karl-Heinz Rützel

Karl-Heinz Rützel 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 the preparation of anhydrous sodium sulfide
    Patent number: 6503474
    Abstract: A process is disclosed for the preparation of anhydrous sodium sulfide by heating sodium sulfide having a water content of from 38 to 40% in a contact drier in vacuo, the temperature of the solid to be dried being increased from approximately 20° C. at the solid inlet to ≧180° C. at the solid outlet.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: January 7, 2003
    Assignee: Degussa AG
    Inventors: Robert Magiera, Hans Christian Alt, Gerhard Rasig, Jörg Münzenberg, Christoph Batz-Sohn, Ralf Goedecke, Ulrich Deschler, Volker Knapp, Karl-Heinz Rützel
  • Process for the preparation of organosilylalkylpolysulfanes
    Patent number: 6423859
    Abstract: The invention relates to a process for the preparation of organosilylalkylpolysulfanes, of the general formula I (R1R2R3SiR4)2Sx (I) by reaction of organosilylalkylpolysulfanes of the general formula II (R1R2R3SiR4)2Sy (II) with an ionic sulfide of the general formula M+2S2− (III) and an organosilylalkyl halide of the general formula R1R2R3SiR4X (IV), the long-chain organosilylalkylpolysulfane of the general formula (II) and the organosilylalkyl halide of the general formula (IV) being initially introduced into the reaction vessel and the ionic sulfide of the general formula (III) being added to this solution in several portions.
    Type: Grant
    Filed: July 13, 2001
    Date of Patent: July 23, 2002
    Assignee: Degussa AG
    Inventors: Alfred Alig, Christoph Batz-Sohn, Ulrich Deschler, Rudolf Michel, Jörg Münzenberg, Raymund Sonnenschein, Werner Will, Gerd Rainhard Zezulka, Karl-Heinz Rützel