Patents by Inventor Steffen Kühling

Steffen Kühling 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 dis(4-hydroxyaryl) alkanes
    Patent number: 6316678
    Abstract: The present invention relates to a process for producing bis(4-hydroxy-aryl)alkanes of high purity from addition products of bis(4-hydroxy-aryl)alkanes and aromatic hydroxy compounds which are obtained by the acid-catalysed reaction of the aromatic hydroxy compounds with ketones.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: November 13, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Steffen Kühling, Rolf Lanze, Rainer Neumann, Frieder Heydenreich, Tony van Osselaer, Gerhard Fennhoff