Patents by Inventor Ralf Krahwinkel

Ralf Krahwinkel 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 N-methyl-p-toluidine for use as an additive for aviation gasoline
    Patent number: 11834385
    Abstract: The invention relates to novel methods for preparing N-methyl-p-toluidine for the use thereof as additive for aviation fuel, and to specific catalysts for these methods.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: December 5, 2023
    Assignee: LANXESS Corporation
    Inventors: Martina Gerdinand, Rainer Dost, Ralf Krahwinkel, Hans-Jurgen Quella, Daniel Ullrich, Patrick Kurr
  • Method for producing N-methyl-p-toluidine for use as an additive for aviation gasoline
    Patent number: 10875823
    Abstract: The invention relates to novel methods for preparing N-methyl-p-toluidine for the use thereof as additive for aviation fuel, and to specific catalysts for these methods.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: December 29, 2020
    Assignee: LANXESS Deutschland GmbH
    Inventors: Martina Gerdinand, Rainer Dost, Ralf Krahwinkel, Hans-Jurgen Quella, Daniel Ullrich, Patrick Kurr
  • METHOD FOR PRODUCING N-METHYL-P-TOLUIDINE FOR USE AS AN ADDITIVE FOR AVIATION GASOLINE
    Publication number: 20200290947
    Abstract: The invention relates to novel methods for preparing N-methyl-p-toluidine for the use thereof as additive for aviation fuel, and to specific catalysts for these methods.
    Type: Application
    Filed: May 28, 2020
    Publication date: September 17, 2020
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Martina GERDINAND, Rainer DOST, Ralf KRAHWINKEL, Hans-Jurgen QUELLA, Daniel ULLRICH, Patrick KURR
  • METHOD FOR PRODUCING N-METHYL-P-TOLUIDINE FOR USE AS AN ADDITIVE FOR AVIATION GASOLINE
    Publication number: 20200148625
    Abstract: The invention relates to novel methods for preparing N-methyl-p-toluidine for the use thereof as additive for aviation fuel, and to specific catalysts for these methods.
    Type: Application
    Filed: December 19, 2017
    Publication date: May 14, 2020
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Martina GERDINAND, Rainer DOST, Ralf KRAHWINKEL, Hans-Jurgen QUELLA, Daniel ULLRICH, Patrick KURR
  • Method for producing sorbic anhydride and also use thereof as a preservative in foods
    Patent number: 9102613
    Abstract: A method is described for the production of sorbic anhydride, in which alkali metal or alkaline earth metal salts of sorbic acid are reacted with phosgene in an inert organic solvent. In addition, use thereof as a preservative in foods, in particular drinks, is described.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: August 11, 2015
    Assignee: LANXESS DEUTSCHLAND GMBH
    Inventors: Ralf Krahwinkel, Robert Markert, Edwin Ritzer, Erasmus Vogl
  • Method for the homogeneously catalyzed production of terminal group-capped polyethers
    Patent number: 8742034
    Abstract: The invention provides an improved method for the production of terminal group-capped polyethers using homogeneous catalysis in the presence of Brönstedt acids.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: June 3, 2014
    Assignee: Saltigo GmbH
    Inventor: Ralf Krahwinkel
  • METHOD FOR PRODUCING SORBIC ANHYDRIDE AND ALSO USE THEREOF AS A PRESERVATIVE IN FOODS
    Publication number: 20140087039
    Abstract: A method is described for the production of sorbic anhydride, in which alkali metal or alkaline earth metal salts of sorbic acid are reacted with phosgene in an inert organic solvent. In addition, use thereof as a preservative in foods, in particular drinks, is described.
    Type: Application
    Filed: October 27, 2011
    Publication date: March 27, 2014
    Applicant: LANXESS Deutschland GmbH
    Inventors: Ralf Krahwinkel, Robert Markert, Edwin Ritzer, Erasmus Vogl
  • Process for preparing quaternary salts of piperidyl esters of mandelic acid
    Patent number: 8309732
    Abstract: What is described is a process for preparing compounds of the general formula (I) in which R1, R2 and R3 independently of one another represent hydrogen, an alkyl group or an aryl group, wherein compounds of the general formula (II) in which R1 and R2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R3X??(III), in which X represents a halogen atom and R3 has the meaning given for formula (I), if appropriate in a solvent.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: November 13, 2012
    Assignee: Saltigo GmbH
    Inventors: Andreas Job, Denys Baskakov, Ralf Krahwinkel, Antje Hieronymi
  • METHOD FOR THE HOMOGENEOUSLY CATALYZED PRODUCTION OF TERMINAL GROUP-CAPPED POLYETHERS
    Publication number: 20100076163
    Abstract: The invention provides an improved method for the production of terminal group-capped polyethers using homogeneous catalysis in the presence of Brönstedt acids.
    Type: Application
    Filed: December 11, 2007
    Publication date: March 25, 2010
    Applicant: SALTIGO GMBH
    Inventor: Ralf Krahwinkel
  • PROCESS FOR PREPARING QUATERNARY SALTS OF PIPERIDYL ESTERS OF MANDELIC ACID
    Publication number: 20090270629
    Abstract: What is described is a process for preparing compounds of the general formula (I) in which R1, R2 and R3 independently of one another represent hydrogen, an alkyl group or an aryl group, wherein compounds of the general formula (II) in which R1 and R2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R3X ??(III) in which X represents a halogen atom and R3 has the meaning given for formula (I), if appropriate in a solvent.
    Type: Application
    Filed: April 6, 2009
    Publication date: October 29, 2009
    Applicant: SALTIGO GMBH
    Inventors: Andreas Job, Denys Baskakov, Ralf Krahwinkel, Antje Hieronymi