Patents by Inventor Holger Luetjens

Holger Luetjens 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).

  • Solid, particulate tanning agent preparations
    Patent number: 10870896
    Abstract: Solid particulate material containing a) at least one compound containing carbamoylsulphonate groups and b) at least one organic tanning agent.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: December 22, 2020
    Assignee: LANXESS Deutschland GmbH
    Inventors: Juergen Reiners, Christopher Tysoe, Holger Luetjens, Rafael Grosch, Franz Heinzelmann, Christopher Henzel
  • SOLID, PARTICULATE TANNING AGENT PREPARATIONS
    Publication number: 20140123399
    Abstract: Solid particulate material containing a) at least one compound containing carbamoylsulphonate groups and b) at least one organic tanning agent.
    Type: Application
    Filed: March 29, 2012
    Publication date: May 8, 2014
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Juergen Reiners, Christopher Tysoe, Holger Luetjens, Rafael Grosch, Franz Heinzelmann, Christopher Henzel
  • Process for preparing monodisperse ion exchangers having chelating functional
    Patent number: 7077964
    Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: July 18, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lütjens
  • Process for preparing monodisperse anion exchangers
    Patent number: 7053129
    Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers by (a) reacting monomer droplets made from monovinylaromatic compounds and polyvinylaromatic compounds, and optional porogens and/or initiators, (b) amidomethylating the resultant monodisperse, crosslinked bead polymers with phthalimide derivatives, (c) converting the amidomethylated bead polymers to aminomethylated bead polymers, and (d) alkylating the aminomethylated bead polymers.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: May 30, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Rüdiger Seidel, Alfred Mitschker, Holger Lütjens
  • Process for the preparation of strongly basic anion exchangers using ethylene oxide
    Patent number: 6716889
    Abstract: Reacting weakly basic anion exchangers bearing tertiary amino groups with ethylene oxide under pH control and addition of acid leads to superior strongly basic anion exchangers.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: April 6, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Lütjens, Axel Ingendoh, Karl-Rudolf Gassen, Peter Wenzl, Klaus Rall
  • Process for preparing monodisperse anion exchangers having strongly basic functional groups
    Patent number: 6699913
    Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers having strongly basic functional groups either in the center of the resin particle or in the shell of the resin particle, as well as to their use.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: March 2, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Ulrich Schnegg, Rüdiger Seidel, Hans-Karl Soest, Alfred Mitschker, Holger Lütjens
  • Method for producing osmotically and mechanically stable gel-like anion exchangers
    Patent number: 6667349
    Abstract: The present invention relates to a process for preparing gel-like anion exchangers by aminating crosslinked gel-like styrene divinybenzene bead polymers that contain halogenoalkyl groups in the presence of an inorganic salt and in the absence of organic solvents.
    Type: Grant
    Filed: October 11, 2000
    Date of Patent: December 23, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Lütjens, Reinhold Klipper, Georg Martin, Alfred Mitschker, Michael Holzbrecher
  • Process for preparing monodisperse ion exchangers having chelating functional groups and the use thereof
    Patent number: 6649663
    Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: November 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lütjens
  • Process for the preparation of low-bleeding cation exchangers
    Patent number: 6646017
    Abstract: Strongly acid cation exchangers with improved properties are obtained if the sulphonation of the non-functionalized polymers is carried out at a high temperature and/or in the absence of oxygen.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: November 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Maria Klipper, Rudolf Wagner, Olaf Halle, Klaus Rall, Holger Lütjens
  • Process for preparing selective ion exchangers
    Patent number: 6610753
    Abstract: The present invention relates to a process for preparing selective ion exchangers based on crosslinked vinylaromatic polymers and containing iminoacetic acid units of the general formulas (I) and (II) wherein X represents hydrogen or an alkali metal ion, by reacting a weak-base anion exchanger bearing primary amino groups with monochloro-acetic acid and/or an alkali metal salt of monochloroacetic acid at a temperature of from 70 to 110° C. and a pH of from 7 to 11.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: August 26, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Lütjens, Klaus Rall, Axel Ingendoh, Reinhold Klipper
  • Process for preparing monodisperse, crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds
    Patent number: 6329435
    Abstract: The present invention relates to a process for preparing novel, monodisperse crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds, in particular heavy metal compounds or noble metal compounds.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: December 11, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Heiko Hoffmann, Dieter Mauer, Bernhard Lehmann, Bruno Hees, Holger Lütjens
  • Process for the preparation of crosslinked spherical polymers
    Patent number: 6221287
    Abstract: This invention relates to suspension polymers having high swellability have low contents of soluble fractions prepared using aliphatic peroxyesters as polymerization initiators.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: April 24, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Podszun, Olaf Halle, Werner Strüver, Robert Bloodworth, Holger Lütjens