Patents by Inventor Dieter Irmscher

Dieter Irmscher 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 alkaline saponification of crosslinked acrylonitrile bead polymers
    Patent number: 7166645
    Abstract: The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature T1 of from 70 to 120° C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature T2 of from 120 to 180° C.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: January 23, 2007
    Assignee: Lanxess Deutschland GmbH
    Inventors: Michael Happ, Dieter Irmscher, Wolfgang Podszun, Rudiger Seidel, Wolfgang Zarges
  • Process for the alkaline saponification of crosslinked acrylonitrile bead polymers
    Publication number: 20050090621
    Abstract: The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature T1 of from 70 to 120° C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature T2 of from 120 to 180° C.
    Type: Application
    Filed: April 21, 2004
    Publication date: April 28, 2005
    Applicant: Bayer Chemicals AG
    Inventors: Michael Happ, Dieter Irmscher, Wolfgang Podszun, Rudiger Seidel, Wolfgang Zarges
  • Process for preparing heterodisperse chelating resins
    Publication number: 20020185443
    Abstract: The object of the present invention is a process for preparing novel heterodisperse chelating resins having chelating functional groups, and their use for adsorbing metal compounds, in particular alkaline earth metals, heavy metal compounds and precious metal compounds, and also for extracting alkaline earth metals from saline solutions derived from alkali metal chloride electrolysis, and also in hydrometallurgy.
    Type: Application
    Filed: April 29, 2002
    Publication date: December 12, 2002
    Inventors: Reinhold Klipper, Rudiger Seidel, Bruno Hees, Dieter Irmscher, Bernhard Lehmann, Holger Lutjens, Ulrich Schnegg, Wolfgang Zarges
  • Process for the preparation of indoles
    Patent number: 5179211
    Abstract: Indoles of the formula ##STR1## can be prepared by reaction of a phenylhydrazine of the formula ##STR2## which is unsubstituted in at least one ortho-position, with a ketone of the formula ##STR3## in an aqueous medium in the presence of an acid compound, less than 5 equivalents, based on 1 mol of phenylhydrazine, of an acid compound having a pK value of 1.3-4.5 being employed.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: January 12, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz U. Blank, Friedrich-Wilhelm Ullrich, Karlheinrich Meisel, Willi Streicher, Nikolaus Schulz, Dieter Irmscher, Gunther Klag