Patents by Inventor Frank Doebert

Frank Doebert 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 and apparatus for the preparation of polycarbonate
    Patent number: 8394912
    Abstract: The invention relates to a process for the pretreatment of material surfaces in order to minimize the interaction between polycarbonate and metal and, in the processing and synthesis of polycarbonate, to obtain a high-quality polymer which in particular does not become discolored and is free of insoluble constituents.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: March 12, 2013
    Assignee: Bayer MaterialScience AG
    Inventors: Frank Doebert, Andreas Stremmel, Christoph Biedron, Stephan Laue, Johann Rechner, Torsten Hagen, Frank Bruynseels, Frank Quaeyhaegens, Johan Decloedt, Paul Van Dorst, Uwe Arndt, Johan Vanden Eynde, Ursula Tracht, Thomas König, Ulrich Liesenfelder
  • PROCESS AND APPARATUS FOR THE PREPARATION OF POLYCARBONATE
    Publication number: 20110184144
    Abstract: The invention relates to a process for the pretreatment of material surfaces in order to minimize the interaction between polycarbonate and metal and, in the processing and synthesis of polycarbonate, to obtain a high-quality polymer which in particular does not become discoloured and is free of insoluble constituents.
    Type: Application
    Filed: December 20, 2010
    Publication date: July 28, 2011
    Applicant: Bayer MaterialScience AG
    Inventors: Frank Doebert, Andreas Stremmel, Christoph Biedron, Stephan Laue, Johann Rechner, Torsten Hagen, Frank Bruynseels, Frank Quaeyhaegens, Johan Decloedt, Paul Van Dorst, Uwe Arndt, Johan Vanden Eynde, Ursula Tracht, Thomas König, Ulrich Liesenfelder
  • Continuous preparation of cyclohexene by partial hydrogenation of benzene
    Patent number: 6344593
    Abstract: Cyclohexene is prepared by partial hydrogenation of benzene with hydrogen in the presence of water and ruthenium catalyst at elevated temperature and superatmospheric pressure by a continuous process in which benzene is introduced in gaseous form and the resulting cyclohexene is discharged in gaseous form and the catalyst is present in solution or suspension in a liquid, aqueous phase.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: February 5, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Johann Gaube, Frank Doebert