Patents by Inventor Sven Koehnen

Sven Koehnen 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 production of a modified acetalated polyvinyl alcohol
    Patent number: 8178618
    Abstract: The invention relates to a method for modifying acetalated polyvinyl alcohols comprising reacting a melt acetalated polyvinyl alcohols with epoxides. The invention also relates to uses of the resultant modifying acetalated polyvinyl alcohols, including uses in ceramic applications.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: May 15, 2012
    Assignees: Kuraray Europe GmbH, Kuraray Co. Ltd.
    Inventors: Michael Frank, Sven Köhnen, Matthias Gutweiler, Kaoru Ikeda
  • METHOD FOR THE MODIFICATION OF POLYVINYL BUTYRALS
    Publication number: 20090176937
    Abstract: The invention relates to a method for modifying acetylized polyvinyl alcohols by reacting the same with epoxides in the polymer melt. Also disclosed is the use of said products in ceramic applications, for example.
    Type: Application
    Filed: December 21, 2006
    Publication date: July 9, 2009
    Inventors: Michael Frank, Sven Köhnen, Matthias Gutweiler, Kaoru Ikeda
  • Polyvinyl Acetal-Containing Granulate, Method for the Production and the Utilization Thereof
    Publication number: 20080203593
    Abstract: The invention relates to a method for the production of a granulate containing at least one polyvinyl acetal, wherein a composition containing a polyvinyl acetal is transformed into molten state and granulated in accordance with the desired grain size. The invention also relates to a granulate produced according to said method and to the utilization of the inventive granulate.
    Type: Application
    Filed: August 9, 2004
    Publication date: August 28, 2008
    Inventors: Martin Steuer, Bekir Bucak, Simon Jonas, Matthisas Gutweiler, Sven Koehnen