Patents by Inventor Ludwig Pohl

Ludwig Pohl 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).

  • Publication number: 20100264368
    Abstract: Liquid Crystal Molecules Comprising Hydroazulene Structures Compounds of formula (I); R1i-A1i-(Z2i-A2i)m-(Z3i-A3i)n-(Z4i-A4i)o-R2i (i) wherein at least one of the divalent groups Ai is derived from at least partially hydrogenated azulene, R1i and R2i being hydrogen, an optionally substituted alkyl or alkylene residue, R2i also standing for —CN, —N?C?S, —F, —Cl, —SF5, —CF3, —CHF2, CH2F—O—CF3, —O—CHF2, —O—CH2F, —O—CF2—CF2H, or —O—C2F5, A1i, A2i, A3i and A4i being partially or completely hydrogenated 2,6-azulene, trans-1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-14-phenylene, 2,3- and 2,6-difluoro-1,4-phenylene, and 3,5-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, and 1,4-dioxane-2,5-diyl, Z1i, Z2i, Z3i and Z4i being a single bond, —CH2—CH2—, —CF2—CF2—, an ester bond —CO—O—, trans and —CF2—O—, m, n and 0 being independently 0, 1, or 2, liquid crystal media comprising these compounds and liquid crystal displays made with mixtures comprising the novel compounds.
    Type: Application
    Filed: June 19, 2006
    Publication date: October 21, 2010
    Applicant: TETRAGON-CHEMIE AG
    Inventors: Ludwig Pohl, Henning Hopf, Zakir Hussain
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Patent number: 6596890
    Abstract: Organometallic aluminum compounds of the general formula (I) where X1 is NH, NH2*, NH—A*, N—A, N(A)2*, O, OA*, O-Aryl*, S, SA*, P, P(A)2* or a single bond, X2 is NH, N—A, O, S, PA or X1 coordinated to Al(R1)3, or a single bond, R1 is H; Hal if n=0; A which may be covalently bound to Al; Si(A)3 if X1=O, R2 is A or divalent aryl groups defined note particularly below or divalent unsaturated aliphatic groups defined more particularly below, R3 and R4 are, independently of one another, a bond or R2 or Si(A)3 or Si(A)2, Z1 is a bond or H bound to R2, Z2 is a bond or H bound to R2 or R3, A is branched or unbranched C1-C7-alkyl, C1-C7-alkylidene or C1-C7-alkenylidene, Aryl is phenyl, naphthyl, Hal is F, Cl, and, independently of one another, n, m, p and l are 0 or 1 and q is 1 or 2, where &Sgr;l+m+n≧3.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: July 22, 2003
    Assignee: Merck Patent Gesellschaft
    Inventors: Eike Poetsch, Ludwig Pohl, Karin Weiss, Eva Maria Auth, Thomas Metzner, Herbert Schumann, Corinna Wassermann, Michael Frick, Bernd Heymer, Stefan Schutte, Ulf Dümichen, Elmar Hecht
  • 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
  • Patent number: 6107493
    Abstract: The invention relates to a process for the preparation of cyclic perfluoroalkanebis(sulfonyl)imides and salts thereof.The new compound lithium cyclo-difluoromethanebis(sulfonyl)imide is outstandingly suitable as a conductive salt in non-aqueous electrolytes for lithium secondary batteries.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: August 22, 2000
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Ludwig Pohl, Volker Hilarius, Peter Sartori, Ralf Jueschke
  • Patent number: 6048643
    Abstract: The invention relates to a process for preparing lithium intercalation compounds by thermal solid state reaction of mixtures of lithium hydroxide or lithium oxide and oxides or oxide precursors of transition metals. A significant step of this process is the treatment of an aqueous suspension of the raw material components lithium hydroxide or lithium oxide and metal oxide or metal oxide precursors with hydrogen peroxide, resulting in the lithium compound going into solution. In the drying of the mixture, the lithium hydroxide is very uniformly absorbed onto the metal oxide. Calcination at temperatures between 450.degree. C. and 700.degree. C. results in complete reaction to form the lithium intercalation compound in less than 5 hours.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: April 11, 2000
    Assignee: Merck Patent Gesellschaft
    Inventors: Max van Ghemen, Birgit Sauerbrey, Ludwig Pohl
  • 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
  • Patent number: 5879654
    Abstract: The invention relates to a process for preparing lithium intercalation compounds by thermal solid state reaction of mixtures of lithium hydroxide or lithium oxide and oxides or oxide precursors of transition metals. A significant step of this process is the treatment of an aqueous suspension of the raw material components lithium hydroxide or lithium oxide and metal oxide or metal oxide precursors with hydrogen peroxide, resulting in the lithium compound going into solution. In the drying of the mixture, the lithium hydroxide is very uniformly absorbed onto the metal oxide. Calcination at temperatures between 450.degree. C. and 700.degree. C. results in complete reaction to form the lithium intercalation compound in less than 5 hours.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: March 9, 1999
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Max van Ghemen, Birgit Sauerbrey, Ludwig Pohl
  • Patent number: 5851946
    Abstract: The invention relates to the use of intramolecularly stabilized organometallic compounds as components in coordination catalyst systems, corresponding coordination catalyst systems and processes for the preparation of polymers by coordination polymerization of unsaturated hydrocarbons by catalysed metathesis of alkenes and alkynes using such coordination catalyst systems.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: December 22, 1998
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Ludwig Pohl, Eike Poetsch, Hans-Ludwig Hirsch, Herbert Schumann, Karin Weiss
  • Patent number: 5698761
    Abstract: The invention relates to the use of cyclic organometallic compounds as components in coordination catalyst systems, to corresponding coordination catalyst systems and also to processes for the preparation of polymers by coordination polymerization and of unsaturated hydrocarbons by catalyzed metathesis of alkenes and alkynes using such coordination catalyst systems.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 16, 1997
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Ludwig Pohl, Eike Poetsch, Herbert Schumann, Karin Weiss, Karl-Heinz Thiele, Hans-Ludwig Hirsch
  • Patent number: 5698309
    Abstract: Moldings, preferably comprising polyester which contains oxide particles which have been subjected to a surface modification with a silylating agent of the formula I?R.sup.1 R.sup.2 R.sup.3 !Si--(CH.sub.2).sub.l --X--R.sup.4 (I)whereinR.sup.1 is Cl or alkoxy having 1 to 6 carbon atoms,R.sup.2 and R.sup.3 are alkyl having 1 to 6 carbon atoms or R.sup.1,l is a number from 1 to 6,X is a single bond, O, NH, CONH or NHCONH,R.sup.4 is ##STR1## where Y is CH, ##STR2## Z is OR or two radicals Z together are --O-- or NR and m and n are a number from 0 to 6, or R.sub.4 is ##STR3## where X is a single bond and R, R' and R" are H or alkyl having 1 to 6 carbon atoms,and the use of said moldings are described.
    Type: Grant
    Filed: April 5, 1995
    Date of Patent: December 16, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hermann Dallmann, Joachim Kinkel, Kurt Marquard, Ludwig Pohl
  • Patent number: 5618872
    Abstract: The invention relates to the use of momodisperse, non-porous, spherical particles based on SiO.sub.2, TiO.sub.2, ZrO.sub.2, Al.sub.2 O.sub.3, V.sub.2 O.sub.5, Nb.sub.2 O.sub.5 or mixed systems thereof, which are optionally modified on the surface by covalently bonded organic groups, as fillers in organic matrix materials, the refractive index of the particles being adapted to the refractive index of the organic matrix according to the use.Polymeric or polymerizable systems which comprise these particles can be used, for example, as embedding compositions for optical, electro-optical and optoelectronic components. Such embedding compositions show an improved optical homogeneity. Light-emitting diodes produced with them are distinguished, inter alia, by an improved light yield.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: April 8, 1997
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Siemens AG
    Inventors: Ludwig Pohl, Kurt Marquard, G unter Waitl, Ulrike Reeh, Ernst Wipfelder
  • Patent number: 5519525
    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: November 15, 1993
    Date of Patent: May 21, 1996
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans A. Kurmeier, Ekkehard Bartmann
  • Patent number: 5494949
    Abstract: The invention relates to oxide particles which have a surface modification by covalently bonded organic groups which allow covalent bonding into polymer materials. These particles are particularly advantageous in their use as fillers or modifying agents in polymer materials, in particular polymer films.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: February 27, 1996
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Hoechst Aktiengesellschaft
    Inventors: Joachim Kinkel, Kurt Marquard, Ludwig Pohl
  • Patent number: 5487357
    Abstract: The invention relates to the use of boron-containing organic group-V compounds for the deposition of the elements of the Vth main group on substrates by gas-phase deposition.
    Type: Grant
    Filed: January 28, 1994
    Date of Patent: January 30, 1996
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Ludwig Pohl, Herbert Schumann, Christian Marschall