Patents by Inventor Stefan Merget

Stefan Merget 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).

  • Chiral selectors and stationary phases for separating enantiomer mixtures
    Patent number: 8647882
    Abstract: Chiral selectors having ?-unsubstituted ?-amino acid derivatives of the structure: a stationary phase for separating substance mixtures containing the chiral selector, and processes for separating mixtures of chiral substances, including enantiomers, and especially enantiomers of substances selected from ?-amino acids and derivatives thereof, ?-amino acids and ?-hydroxy acids are provided.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: February 11, 2014
    Assignee: Evonik Degussa GmbH
    Inventors: Franz-Rudolf Kunz, Peter Richter, Stefan Merget, Roland Singer, Thomas Mueller
  • Chiral selectors and stationary phases for separating enantiomer mixtures
    Patent number: 8268631
    Abstract: Chiral selectors having ?-unsubstituted ?-amino acid derivatives of the structure: a stationary phase for separating substance mixtures containing the chiral selector, and processes for separating mixtures of chiral substances, including enantiomers, and especially enantiomers of substances selected from ?-amino acids and derivatives thereof, ?-amino acids and ?-hydroxy acids are provided.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: September 18, 2012
    Assignee: Evonik Degussa GmbH
    Inventors: Franz-Rudolf Kunz, Peter Richter, Stefan Merget, Roland Singer, Thomas Mueller
  • NOVEL CHIRAL SELECTORS AND STATIONARY PHASES FOR SEPARATING ENANTIOMER MIXTURES
    Publication number: 20120015443
    Abstract: Chiral selectors having ?-unsubstituted ?-amino acid derivatives of the structure: a stationary phase for separating substance mixtures containing the chiral selector, and processes for separating mixtures of chiral substances, including enantiomers, and especially enantiomers of substances selected from ?-amino acids and derivatives thereof, ?-amino acids and ?-hydroxy acids are provided.
    Type: Application
    Filed: September 23, 2011
    Publication date: January 19, 2012
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Franz-Rudolf Kunz, Peter Richter, Stefan Merget, Roland Singer, Thomas Mueller
  • NOVEL CHIRAL SELECTORS AND STATIONARY PHASES FOR SEPARATING ENANTIOMER MIXTURES
    Publication number: 20090229352
    Abstract: Chiral selectors having ?-unsubstituted ?-amino acid derivatives of the structure: a stationary phase for separating substance mixtures containing the chiral selector, and processes for separating mixtures of chiral substances, including enantiomers, and especially enantiomers of substances selected from ?-amino acids and derivatives thereof, ?-amino acids and ?-hydroxy acids are provided.
    Type: Application
    Filed: March 10, 2009
    Publication date: September 17, 2009
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Franz-Rudolf Kunz, Peter Richter, Stefan Merget, Roland Singer, Thomas Mueller
  • Chromatographic separation of enantiomers of protected amino acids via smb-method
    Publication number: 20040198974
    Abstract: The present invention is directed to the separation of enantiomers of racemates of formula (I). The separation proceeds by applying deemed racemates to continuos enantioselective chromatography like SMB. The methods predominantly is performed for industrial scale production of pure enantiomers of deemed amino acids which are useful intermediates in organic synthesis.
    Type: Application
    Filed: February 13, 2004
    Publication date: October 7, 2004
    Inventors: Kurt Guenther, Stefan Merget, Karlheinz Drauz, Hans-Peter Krimmer, Michael Schwarm
  • Chromatographic separation of enantiomers of bicyclic lactams
    Patent number: 6656902
    Abstract: A method for separation of enantiomers of a lactam represented by formula (I): where n and m are each, independently, 0, 1, 2, or 3; P is H or an N-protecting group; and the dotted line represents an optional double bond, by liquid chromatographing the mixture on a chiral stationary phase, where said stationary phase is derivitized with at least one sugar derivative, with an eluent which comprises acetonitrile.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: December 2, 2003
    Assignee: Degussa AG
    Inventors: Kurt Guenther, Stefan Merget, Karlheinz Drauz, Hans-Peter Krimmer
  • Chromatographic separation of enantiomers of bicyclic lactams
    Publication number: 20010021779
    Abstract: A method for separation of enantiomers of a lactam represented by formula (I): 1
    Type: Application
    Filed: December 22, 2000
    Publication date: September 13, 2001
    Applicant: Degussa-Huels Aktiengesellschaft
    Inventors: Kurt Guenther, Stefan Merget, Karlheinz Drauz, Hans-Peter Krimmer
  • Method for the racemization of enantiomers of .alpha.-lipoic acid
    Patent number: 5621117
    Abstract: Method for the conversion of the enantiomers of .alpha.-lipoic acid into the corresponding racemic mixture by racemizing the .alpha.-lipoic acid (pure optical isomers of .alpha.-lipoic acid or mixtures of optical isomers of .alpha.-lipoic acid wherein one of the optical isomers is present in excess) at temperatures of between 110.degree. C. and 200.degree. C. at pressures of from normal pressure up to 50 bar for a reaction time of 10 to 48 hours.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: April 15, 1997
    Assignee: ASTA Medica Aktiengesellschaft
    Inventors: Horst Bethge, Roland Moeller, Gerhard Sator, Stefan Merget, Thomas Beisswenger