Patents by Inventor Stefan Lotter

Stefan Lotter 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).

  • Method for producing organosilanes
    Patent number: 8138365
    Abstract: The invention relates to a method for producing organosilanes of general formula I, [R(R)(R?O)Si—R?—]2Sm??I by reaction of (halo-organo)alkoxysilanes of formula II, [R(R)(R?O)Si—R?-Hal??II with a sulfuring reagent, selected from alkaline hydrogensulfide, alkaline sulfide Me2S, alkaline polysulfide Me2Sg and any combination thereof and optionally additionally with sulfur and/or with H2S in a solvent, the alkaline hydroxy content of all materials used being <0.44 wt. %.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: March 20, 2012
    Assignee: Evonik Degussa GmbH
    Inventors: Karsten Korth, Philipp Albert, Susann Witzsche, Ingo Kiefer, Jörg Kiefer, Stefan Lotter, Jaroslaw Monkiewicz, Jörg Schmidt
  • Process for the preparation of organosilicon compounds
    Patent number: 7371881
    Abstract: A process for the preparation of an organosilicon compound of the formula (I) (R1R2R3SiR4)2Sx??(I) by reacting haloalkoxysilanes of the general formula (II) R1R2R3SiR4X??(II) with a dry polysulphide of the general formula (III) M2Sz??(III) and/or dry sulphide of the general formula IV M2S??(IV) and optionally sulphur in an organic solvent, the organic solvent being removed from the resulting suspension, the mixture containing the organosilicon compound of the general formula (I) and the solid MX being mixed with water containing at least one buffer, and the resulting phases being separated.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: May 13, 2008
    Assignee: Degussa AG
    Inventors: Albert Frings, Louis Janssens, Stefan Lotter, Ulrich Deschler, Alfred Alig
  • Process for the preparation of organosilicon compounds
    Publication number: 20070066841
    Abstract: A process for the preparation of an organosilicon compound of the formula (I) (R1R2R3SiR4)2Sx??(I) by reacting haloalkoxysilanes of the general formula (II) R1R2R3SiR4X??(II) with a dry polysulphide of the general formula (III) M2Sz??(III) and/or dry sulphide of the general formula IV M2S??(IV) and optionally sulphur in an organic solvent, the organic solvent being removed from the resulting suspension, the mixture containing the organosilicon compound of the general formula (I) and the solid MX being mixed with water containing at least one buffer, and the resulting phases being separated.
    Type: Application
    Filed: August 2, 2006
    Publication date: March 22, 2007
    Inventors: Albert Frings, Louis Janssens, Stefan Lotter, Ulrich Deschler, Alfred Alig