Patents by Inventor Andreas Schlemenat

Andreas Schlemenat 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 AQUEOUS FORMALDEHYDE SOLUTIONS
    Publication number: 20100137450
    Abstract: Aqueous formaldehyde solutions are prepared and the formaldehyde content of the aqueous formaldehyde solutions produced is determined by an online analytical method. The desired formaldehyde content can subsequently be established by addition of water so that an aqueous formaldehyde solution having a defined formaldehyde content (formalin) is obtained.
    Type: Application
    Filed: November 19, 2009
    Publication date: June 3, 2010
    Applicant: Bayer MaterialScience AG
    Inventors: Heniz-Herbert Müller, Stephan Ehlers, Andreas Schlemenat, Arnulf Werner, Martin Schiffhauer
  • Process for producing aliphatic oligocarbonate diols
    Patent number: 7112693
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: September 26, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Tillack, Jörg Laue, Herbert Witossek, Andreas Schlemenat
  • Method for producing aliphatic oligocarbonate diols
    Patent number: 6833433
    Abstract: A process for the production of aliphatic oligocarbonate diols is disclosed. The optionally catalyzed high yield process entails the multistage transesterification of aliphatic diols with dimethyl carbonate. In the process DMC-methanol mixtures that have been distilled off are recycled to the reaction solution with further conversion and depletion of the contained DMC in the same or in a following reaction batch.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: December 21, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Schlemenat, Jörg Tillack, Jörg Laue, Herbert Witossek
  • Process for producing aliphatic oligocarbonate diols
    Patent number: 6818784
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: November 16, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Tillack, Jörg Laue, Herbert Witossek, Andreas Schlemenat
  • Process for producing aliphatic oligocarbonate diols
    Publication number: 20040143130
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Application
    Filed: December 12, 2003
    Publication date: July 22, 2004
    Inventors: Jorg Tillack, Jorg Laue, Herbert Witossek, Andreas Schlemenat
  • Process for producing aliphatic oligocarbonate diols
    Publication number: 20030009047
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Application
    Filed: June 26, 2002
    Publication date: January 9, 2003
    Inventors: Jorg Tillack, Jorg Laue, Herbert Witossek, Andreas Schlemenat
  • Process for the preparation of d,l-menthol
    Publication number: 20020019573
    Abstract: Process for the preparation of d,l-menthol by catalytic isomerization of stereoisomers of menthol or mixtures of these isomers at temperatures of from 30 to 170° C. in the presence of a supported ruthenium catalyst, the support material used being Al2O3.
    Type: Application
    Filed: May 8, 2001
    Publication date: February 14, 2002
    Inventors: Andreas Schlemenat, Reinhard Langer, Claus Dreisbach, Hans-Jurgen Gross, Thomas Prinz, Andreas Schulze-Tilling, Michael Friederich, Jorg-Dietrich Jentsch, Gerald John