Patents by Inventor Nicole Nitschke

Nicole Nitschke 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 preparation of 3.7-diazabicyclo[3.3.1] nonane compounds
    Patent number: 8148530
    Abstract: The present invention relates to a process for the preparation of 3,7-diazabicyclo[3.3.1]nonane compounds. According to the invention, in a first step, a dicarboxylic acid ester is reacted with a pyridine aldehyde and a primary amine. The piperidone which forms is reacted in a second stage with formaldehyde and a further primary amine. It is essential to the invention that, in the first reaction stage, a C2-C4-alcohol is used as solvent and, in the second reaction stage, a C3-C4-alcohol is used as solvent.
    Type: Grant
    Filed: June 10, 2006
    Date of Patent: April 3, 2012
    Assignee: Clariant Produkte (Deutschland) GmbH
    Inventors: Michael Wessling, Barbara Duecker, Nicole Nitschke
  • Method for producing N,N-bis(pyridin-2ylmethyl)-1,1-bis(pyridin-2-yl)-1-aminoalkane compounds and metal complex salts containing these compounds
    Patent number: 7977487
    Abstract: The invention relates to a method for producing the compositions cited in the title. According to this method: dipyridyl ketone is reacted with hydroxylamine; the oxime obtained thereby is reduced without intermediate isolation to form 1,1-di-(2-pyridyl)-methylamine, and; this amine is firstly reacted with 1 to 1.5 molar equivalent of picolyl chloride and then with another 1 to 1.5 molar equivalent of picolyl chloride to form the amine of formula (1). This amine is purified via the tetrafluoroborate salt and subsequently alkylated with an alkyl iodide. This method represents an improvement with regard to prior art methods for producing these compounds.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: July 12, 2011
    Assignee: Clariant Produkte (Deutschland) GmbH
    Inventors: Michael Wessling, Barbara Duecker, Nicole Nitschke
  • Surfactant Mixtures With Synergistic Characteristics
    Publication number: 20100267600
    Abstract: The invention discloses mixtures consisting of two or three surfactants from the group containing secondary alkane sulfonates, ?-methyl ester sulfonates and ?-methyl ester sulfonates. Said mixtures exhibit a synergistic cleaning action in comparison to the respective individual surfactants.
    Type: Application
    Filed: June 13, 2008
    Publication date: October 21, 2010
    Applicant: CLARIANT FINANCE (BVI) LIMITED
    Inventors: Frank Richter, Nicole Nitschke, Gerd Reinhardt
  • Polyetheramine production method
    Publication number: 20090234124
    Abstract: The present invention relates to a process for the preparation of 3,7-diazabicyclo[3.3.1]nonane compounds. According to the invention, in a first step, a dicarboxylic acid ester is reacted with a pyridine aldehyde and a primary amine. The piperidone which forms is reacted in a second stage with formaldehyde and a further primary amine. It is essential to the invention that, in the first reaction stage, a C2-C4-alcohol is used as solvent and, in the second reaction stage, a C3-C4-alcohol is used as solvent.
    Type: Application
    Filed: June 10, 2006
    Publication date: September 17, 2009
    Inventors: Michael Wessling, Barbara Duecker, Nicole Nitschke
  • Method for Producing N,N-Bis(Pyridin-2Ylmethyl)-1,1-Bis(Pyridin-2-Yl)-1-Aminoalkane Compounds and Metal Complex Salts Containing These Compounds
    Publication number: 20090221831
    Abstract: The invention relates to a method for producing the compositions cited in the title. According to this method: dipyridyl ketone is reacted with hydroxylamine; the oxime obtained thereby is reduced without intermediate isolation to form 1,1-di-(2-pyridyl)-methylamine, and; this amine is firstly reacted with 1 to 1.5 molar equivalent of picolyl chloride and then with another 1 to 1.5 molar equivalent of picolyl chloride to form the amine of formula (1). This amine is purified via the tetrafluoroborate salt and subsequently alkylated with an alkyl iodide. This method represents an improvement with regard to prior art methods for producing these compounds.
    Type: Application
    Filed: May 26, 2006
    Publication date: September 3, 2009
    Inventors: Michael Wessling, Barbara Duecker, Nicole Nitschke