Patents by Inventor Kai Verkerk

Kai Verkerk 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 producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate
    Patent number: 7202384
    Abstract: The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: April 10, 2007
    Assignee: Bayer MaterialScience Aktiengesellschaft
    Inventors: Joachim Zechlin, Kai Verkerk, Dietmar Wastian, Kartin Joschek, Tim Loddenkemper, Wilfried Pinke, Michael Schelhaas, Georg Ronge
  • Process for producing 5-nitro-3,4-dihydro-1(H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate
    Patent number: 7202378
    Abstract: The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: April 10, 2007
    Assignee: Bayer MaterialScience AG
    Inventors: Joachim Zechlin, Kai Verkerk, Dietmar Wastian, Katrin Joschek, Tim Loddenkemper, Wilfried Pinke, Michael Schelhaas, Georg Ronge
  • Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column
    Patent number: 7118653
    Abstract: Process for the purification of toluenediisocyanate from a crude distillation feed which includes toluenediisocyanate, an organic solvent and less than 2% by weight phosgene by separating the crude distillation feed in a dividing-wall distillation column into at least four product fractions P1–P4. P1 is a phosgene enriched low-boiler product, P2 is a solvent-enriched product, P3 is a high boiler enriched bottoms and P4 is a toluenediisocyanate product stream.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: October 10, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bill Brady, Friedhelm Steffens, Berthold Keggenhoff, Kai Verkerk, Gerhard Ruffert
  • Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification
    Patent number: 7108770
    Abstract: Toluene diisocyanate is recovered from a crude distillation feed containing less than 2% by weight of phosgene by (a) fractionating the crude distillation feed containing less than 2% by weight of phosgene to remove the solvent and optionally the reaction residues to produce a crude toluene diisocyanate feed containing less than 20% by weight of solvent and (b) separating the crude toluene diisocyanate feed containing less than 20% by weight of solvent in a divided-wall distillation column into four product fractions P1–P4. P1 is a vapor phase low-boiler and solvent-enriched gas stream, P2 is a low-boiler and solvent-enriched product, P3 is a high boiler-enriched bottoms product containing toluene diisocyanate and P4 is a toluene diisocyanate product stream lean in low-boilers, high-boilers and reaction residues.
    Type: Grant
    Filed: October 16, 2003
    Date of Patent: September 19, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Marcus Paul Grün, Bill Brady, Jr., Berthold Keggenhoff, Kai Verkerk, Hans-Peter Schal
  • Process for producing 5-nitro-3,4-dihydro-1(H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate
    Publication number: 20060183946
    Abstract: The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.
    Type: Application
    Filed: April 7, 2006
    Publication date: August 17, 2006
    Inventors: Joachim Zechlin, Kai Verkerk, Dietmar Wastian, Katrin Joschek, Tim Loddenkemper, Wilfried Pinke, Michael Schelhaas, Georg Ronge
  • Process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate
    Publication number: 20060178526
    Abstract: The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.
    Type: Application
    Filed: April 7, 2006
    Publication date: August 10, 2006
    Inventors: Joachim Zechlin, Kai Verkerk, Dietmar Wastian, Katrin Joschek, Tim Loddenkemper, Wilfried Pinke, Michael Schelhaas, Georg Ronge
  • Process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1-5-naphthalenediamine and 1,5-naphthalene diisocyanate
    Patent number: 7057071
    Abstract: The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: June 6, 2006
    Assignee: Bayer MaterialScience AG
    Inventors: Joachim Zechlin, Kai Verkerk, Dietmar Wastian, Katrin Joschek, Tim Loddenkemper, Wilfried Pinke, Michael Schelhaas, Georg Ronge
  • Process for the purification of toluenediisocyanate incorporating a dividing-wall distillation column for the final purification
    Publication number: 20040118672
    Abstract: Toluene diisocyanate is recovered from a crude distillation feed comprising less than 2% by weight of phosgene by
    Type: Application
    Filed: October 16, 2003
    Publication date: June 24, 2004
    Inventors: Marcus Paul Grun, Bill Brady, Berthold Keggenhoff, Kai Verkerk, Hans-Peter Schal
  • Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column
    Publication number: 20030230476
    Abstract: Process for the purification of toluenediisocyanate from a crude distillation feed comprising toluenediisocyanate, an organic solvent and less than 2% by weight phosgene by separating the crude distillation feed in a dividing-wall distillation column into at least four product fractions P1-P4.
    Type: Application
    Filed: June 9, 2003
    Publication date: December 18, 2003
    Inventors: Bill Brady, Friedhelm Steffens, Berthold Keggenhoff, Kai Verkerk, Gerhard Ruffert
  • Process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1-5-naphthalenediamine and 1,5-naphthalene diisocyanate
    Publication number: 20030229252
    Abstract: The present invention relates to a process for producing 5-nitro-3,4-dihydro-1(2H)-naphthalinone, 1,5-naphthalenediamine and 1,5-naphthalene diisocyanate, in which 4-(2-nitrophenyl)-n-butyronitrile is converted to 4-(2-nitrophenyl)-n-butyric acid.
    Type: Application
    Filed: May 28, 2003
    Publication date: December 11, 2003
    Inventors: Joachim Zechlin, Kai Verkerk, Dietmar Wastian, Katrin Joschek, Tim Loddenkemper, Wilfried Pinke, Michael Schelhaas, Georg Ronge
  • Process for the preparation of macrocyclic esters
    Patent number: 6458972
    Abstract: Macrocyclic ester compounds can be prepared from oligoesters by thermal cleavage in the presence of a thermostable benzene derivative.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: October 1, 2002
    Assignee: Haarmann & Reimer GmbH
    Inventors: Horst Surburg, Dirk Müller, Stephan Klein, Christine Mendoza-Frohn, Georg Ronge, Kai Verkerk
  • Process for the preparation of macrocyclic esters
    Publication number: 20020095045
    Abstract: Macrocyclic ester compounds can be prepared from oligoesters by thermal cleavage in the presence of a thermostable benzene derivative.
    Type: Application
    Filed: August 21, 2001
    Publication date: July 18, 2002
    Inventors: Horst Surburg, Dirk Muller, Stephan Klein, Christine Mendoza-Frohn, Georg Ronge, Kai Verkerk