Patents by Inventor Ekkehard Bartmann

Ekkehard Bartmann 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 crystallisation of guandinium salts
    Patent number: 7629493
    Abstract: The invention relates to a process for the crystallization of the compounds of the formula (I) or acid-addition salts thereof, in which R1, R2 and R3 have the meaning indicated in Claim 1.
    Type: Grant
    Filed: April 10, 2004
    Date of Patent: December 8, 2009
    Assignee: Merck Patent GmbH
    Inventors: Michael Kirschbaum, Ekkehard Bartmann, Dieter Bensinger, Alexander Haas, Ricky Lippert
  • Matrix liquid crystal display
    Patent number: 7445818
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: November 4, 2008
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Adolf Kurmeier, Ekkehard Bartmann
  • Matrix liquid crystal display
    Publication number: 20070275182
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Application
    Filed: December 18, 2006
    Publication date: November 29, 2007
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Kurmeier, Ekkehard Bartmann
  • Process for the crystallisation of guandinium salts
    Publication number: 20070055064
    Abstract: The invention relates to a process for the crystallisation of the compounds of the formula (I) or acid-addition salts thereof, in which R1, R2 and R3 have the meaning indicated in Claim 1.
    Type: Application
    Filed: April 10, 2004
    Publication date: March 8, 2007
    Applicant: Merck Patent GMBH
    Inventors: Michael Kirschbaum, Ekkehard Bartmann, Dieter Bensinger, Alexander Haas, Ricky Lippert
  • Matrix liquid crystal display
    Patent number: 7186447
    Abstract: Described are matrix liquid crystal displays having two plane parallel support plates which together with a frame form a cell, integrated non-linear elements for switching individual picture elements on the support plates and a nematic liquid crystal mixture which is present in the cell and has a positive dielectric anisotropy and high resistivity. The liquid crystal mixture has a nematic phase range of at least 60° C., a maximum viscosity at 20° C. of 30 mPa·s and a mean dielectricity constant ??8. The liquid crystal mixture contains: a) at least 10% by weight of a liquid-crystalline component B having one or more compounds of the following formulae: and b) up to 90% by weight of a liquid-crystalline component A having one or more compounds with a dielectric anisotropy of ?1.5 to 1.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: March 6, 2007
    Assignee: Merck Patent GmbH
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Adolf Kurmeier, Ekkehard Bartmann
  • Matrix liquid crystal display
    Publication number: 20050196551
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Application
    Filed: March 17, 2005
    Publication date: September 8, 2005
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Kurmeier, Ekkehard Bartmann
  • Method for producing substituted 3-phenylamino-propane-1,2-diols
    Publication number: 20050143582
    Abstract: The present invention relates to an improved process for the preparation of 3-phenylaminopropane-1,2-diols. 3-Phenylaminopropane-1,2-diols are valuable intermediates which can be converted further into 3-phenyloxazolidinone compounds.
    Type: Application
    Filed: January 14, 2003
    Publication date: June 30, 2005
    Inventors: Ekkehard Bartmann, Ingo Sandner
  • Matrix liquid crystal display
    Patent number: 6905740
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Grant
    Filed: March 10, 2003
    Date of Patent: June 14, 2005
    Assignee: Merck Patent GmbH
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Adolf Kurmeier, Ekkehard Bartmann
  • Method for producing sulfonyl-benzoyl guanidinium salts
    Patent number: 6706921
    Abstract: The invention relates to a method for producing acid addition salts of compounds of formula (I), wherein R1, R2 and R3 represent alkyl with 1 to 12 C-atoms.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: March 16, 2004
    Assignee: Merck Patent GmbH
    Inventors: Ekkehard Bartmann, Michael Kirschbaum
  • Matrix liquid crystal display
    Publication number: 20030207046
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Application
    Filed: March 10, 2003
    Publication date: November 6, 2003
    Applicant: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Adolf Kurmeier, Ekkehard Bartmann
  • Method for producing sulfonyl-benzoyl guanidinium salts
    Publication number: 20030162999
    Abstract: The invention relates to a method for producing acid addition salts of compounds of formula (I), wherein R1, R2 and R3 represent alkyl with 1 to 12 C-atoms.
    Type: Application
    Filed: November 6, 2002
    Publication date: August 28, 2003
    Inventor: Ekkehard Bartmann
  • Method for producing ortho-alkylated benzoic acid derivatives
    Patent number: 6573404
    Abstract: The invention relates to a process for the preparation of ortho-alkylated benzoic acid derivatives of the formula I characterized in that an aryl bromide of the formula II is reacted with a secondary or tertiary organolithium compound and CO2.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: June 3, 2003
    Assignee: Merck Patent GmbH
    Inventors: Ekkehard Bartmann, Ingeborg Stein
  • Matrix liquid crystal display
    Patent number: 6562419
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: May 13, 2003
    Assignee: MERCK Patent Gesellschaft mit beschrankter Haftung
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Adolf Kurmeier, Ekkehard Bartmann
  • METHOD FOR PRODUCING ORTHO-ALKYLATED BENZOIC ACID DERIVATIVES
    Publication number: 20030069444
    Abstract: The invention relates to a process for the preparation of ortho-alkylated benzoic acid derivatives of the formula I 1
    Type: Application
    Filed: October 8, 2002
    Publication date: April 10, 2003
    Applicant: MERCK KGAA
    Inventors: Ekkehard Bartmann, Ingeborg Stein
  • Method for producing ortho-alkylated benzoic acid derivatives
    Patent number: 6515143
    Abstract: The invention relates to a process for the preparation of ortho-alkylated benzoic acid derivatives of the formula I characterized in that an aryl bromide of the formula II is reacted with a secondary or tertiary organolithium compound and CO2.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: February 4, 2003
    Assignee: Merck KGaA
    Inventors: Ekkehard Bartmann, Ingeborg Stein
  • Method for producing ortho-alkylated benzoic acid derivatives
    Publication number: 20020091286
    Abstract: The invention relates to a process for the preparation of ortho-alkylated benzoic acid derivatives of the formula I 1
    Type: Application
    Filed: January 8, 2002
    Publication date: July 11, 2002
    Applicant: Merck GmbH
    Inventor: Ekkehard Bartmann
  • Method for producing ortho-alkylated benzoic acid derivatives
    Patent number: 6350904
    Abstract: The invention relates to a process for the preparation of ortho-alkylated benzoic acid derivatives of the formula I characterized in that an aryl bromide of the formula II is reacted with a secondary or tertiary organolithium compound and CO2.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: February 26, 2002
    Assignee: Merck KGaA
    Inventors: Ekkehard Bartmann, Ingeborg Stein
  • Benzene derivatives and liquid-crystalline medium
    Patent number: 6159393
    Abstract: A liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which R, Y, A.sup.1, A.sup.2, Z.sup.1, Z.sup.2, L.sup.1 and m are as defined herein.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: December 12, 2000
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Kazuaki Tarumi, Ekkehard Bartmann, Volker Reiffenrath, Sabine Schoen, Detlef Pauluth, Brigitte Schuler, Eike Poetsch
  • Acid-curable binder systems containing 1,2-disulfones
    Patent number: 6156815
    Abstract: 1,2-Disulfones are particularly suitable as thermally and photochemically activatable latent acid catalysts for binder systems which contain at least one acid-curable component.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: December 5, 2000
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Ekkehard Bartmann, Jorg Ohngemach
  • Matrix liquid crystal display
    Patent number: 6004479
    Abstract: The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 21, 1999
    Assignee: Merck KGAA
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Adolf Kurmeier, Ekkehard Bartmann