Patents by Inventor Herbert Plach

Herbert Plach 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).

  • 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: 20040169159
    Abstract: Novel phenylcyclohexanes of the formula I 1
    Type: Application
    Filed: September 28, 2001
    Publication date: September 2, 2004
    Applicant: MERCK KGAA
    Inventors: Andreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause
  • Patent number: 6781664
    Abstract: The present invention relates to a liquid crystal electro-optical switching member that comprises at least one polariser and a liquid crystal layer having an initial orientation in which the liquid crystal molecules are oriented so as to be essentially parallel to the substrates and to each other. The change of orientation of the liquid crystals, from their initial orientation that is substantially parallel to the substrates, is induced by a corresponding electric field which is oriented so as to be practically parallel to the substrates in the case liquid crystal with a negative dielectric anisotropy and so as to be practically perpendicular to the substrates in the case liquid crystal with a positive dielectric anisotropy. The liquid crystal layer has an optical delay [(d&Dgr;n) LC?] of between 0.06 and 0.43 &mgr;m. The present invention also relates to a liquid crystal display system that comprises said liquid crystal switching members.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: August 24, 2004
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Brigitte Schuler, Achim Götz, Herbert Plach
  • Publication number: 20040089845
    Abstract: Novel phenylcyclohexanes of the formula I 1
    Type: Application
    Filed: October 30, 2003
    Publication date: May 13, 2004
    Inventors: Andreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause
  • Patent number: 6689291
    Abstract: A liquid-crystalline medium based on a mixture of polar compound shaving positive dielectric anisotropy, characterized in that it contains one or more fluorophenylcyclohexene derivatives of the formula I in which R is H, an unsubstituted alkyl or alkenyl radical having up to 18 carbon atoms, in which one or more non-adjacent CH2 groups are optionally replaced by —O—, —S—, —CO—, —O—CO—, —CO—O— or —C≡C—, X is CN or Q—Y, Y is H, F or Cl, Q is —CF2—, —CHF—, —OCF2—, —OCHF—, —OCH2CF2—, —CH═CF—, —CF═CH—, —CF═CF—, —O—CF═CF—, —O—CH═CF— or a single bond, m is 0 or 1, and n is 0, 1 or 2.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: February 10, 2004
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Volker Reiffenrath, Detlet Pauluth, Herbert Plach
  • Patent number: 6677002
    Abstract: Novel phenylcyclohexanes of the formula I: in which n is 0 to 7, Q1 and Q2 are H, or one of these radicals is alternatively CH3, r is 0, 1, 2, 3, 4 or 5, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or a single bond, X is F, Cl, —CF3, —CN, —OCF3 or —OCHF2, and Y and Z are each, independently of one another, H or F, with the proviso that, in the case where A is a single bond, Q1═Q2═H and simultaneously X═CN, Y and/or Z are F.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: January 13, 2004
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Andreas Wächtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause
  • Patent number: 6673268
    Abstract: A MIM-liquid crystal display comprising a MIM diode array, a pair of parallel substrates and a nematic liquid crystalline medium disposed between the pair of substrates, characterized in that the nematic liquid crystalline medium is based on a) a component A comprising one or more compounds of the formula I b) a component B comprising one or more compounds of the formula II in which R1, R2, R3, Z1, Z2, Z3, Z4, Q, X, L1, L2, m and n have the meaning given herein.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: January 6, 2004
    Assignee: Merck Patent Gesellschaft mit beschränkter Haftung
    Inventors: Bernhard Rieger, Atsushi Sawada, Hideo Ichinose, Herbert Plach
  • 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: 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
  • Publication number: 20020043646
    Abstract: Novel phenylcyclohexanes of the formula I 1
    Type: Application
    Filed: September 28, 2001
    Publication date: April 18, 2002
    Applicant: MERCK KGAA
    Inventors: Andreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause
  • Publication number: 20020017634
    Abstract: The invention relates to liquid-crystal media which comprise at least one compound selected from the group of the compounds of the formulae I to III 1
    Type: Application
    Filed: April 30, 2001
    Publication date: February 14, 2002
    Inventors: Michael Heckmeier, Herbert Plach, Hideo Ichinose, Shinji Nakajima, Yasushi Sugiyama, Akiko Takashima
  • Patent number: 6284154
    Abstract: Novel phenylcyclohexanes of the formula I in which n is 0 to 7, Q1 and Q2 are H, or one of these radicals is alternatively CH3, r is 0, 1, 2, 3, 4 or 5, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or a single bond, X is F, Cl, —CF3, —CN, —OCF3 or —OCHF2, and Y and Z are each, independently of one another, H or F, with the proviso that, in the case where A is a single bond, Q1═Q2═H and simultaneously X═CN, Y and/or Z are F.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 4, 2001
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Andreas Wächtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause
  • Publication number: 20010015422
    Abstract: Novel phenylcyclohexanes of the formula I 1
    Type: Application
    Filed: February 8, 2001
    Publication date: August 23, 2001
    Applicant: MERCK PATENT GESELLSCHAFT MIT BESCHRANKTER HAFTUNG
    Inventors: Andreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause
  • Patent number: 6210760
    Abstract: Supertwist liquid crystal displays having very short switching times are obtained if the nematic liquid crystal mixture contains at least one component chosen from group A consisting of compounds of the formulae AI to AVI: wherein R1 and R2 in each case independently of one another are each R and R is alkyl having 1-12 C atoms, wherein one or two non-adjacent CH2 groups can also be replaced by —O—, —CH═CH—, —CO—, —O—CO— or —CO—O—, and up to four other components.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: April 3, 2001
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Georg Weber, Herbert Plach, Takamasa Oyama, Hiroki Yoshitake, Bernhard Scheuble, Reinhard Hittich, Hans Adolf Kurmeier, Eike Poetsch, Klaus Peter Stahl
  • Patent number: 6166798
    Abstract: The invention relates to a TN cell which contains a nematic liquid crystal having positive dielectric anisotropy and a twist angle of essentially 90.degree., between two substrates provided with electrode and alignment layers, where the product of the separation between the substrate plates d and the optical anisotropy d.multidot..DELTA.n [sic] of the liquid crystal is between 0.15 and 0.70 .mu.m, characterised in that the liquid crystal contains a doping component in order to improve the grey shade capacity, so that the cell has a value for the undisturbed quotient of the separation between the substrate plates d and the pitch of the liquid crystal p of 0.1.ltoreq.d/p.ltoreq.0.5.
    Type: Grant
    Filed: April 7, 1998
    Date of Patent: December 26, 2000
    Assignee: Merck KGaA
    Inventors: Herbert Plach, Paulus Adrianus Breddels
  • 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: 5985171
    Abstract: The invention relates to 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 Hal is fluorine or chlorine and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: November 16, 1999
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Bernhard Rieger, Reinhard Hittich, Hans Adolf Kurmeier, David Coates, Herbert Plach
  • Patent number: 5942648
    Abstract: Naphthalene derivatives of the fomula I ##STR1## in which: R.sup.1 is an alkyl or alkenyl radical which is unsubstituted, monosubstituted by CH or CF.sub.3 or monosubstituted by halogen and has 1 to 15 carbon atoms, it also being possible for one or more CH.sub.2 groups in these radicals to be replaced, in each case independently of one another, by --O--, --S--, ##STR2## --CO--, --CO--O--, --O--CO-- or --O--CO--O-- in such a manner that oxygen atoms are not linked directly to one another, ##STR3## m is 0, 1 or 2, n is 0 or 1, wherem+n is 1 or 2,Z.sup.1 and Z.sup.2 are each, independently of one another, --CH.sub.2 CH.sub.2 --, --C.tbd.C-- or a single bond,L.sup.1 and L.sup.2 independently of one another, are H or F,x is an alkyl or alkoxy radical which is unsubstituted, monosubstituted by CN or CF.sub.3 or substituted bi halogen and has 1 to 15 carbon atoms, or is OH, CN, SCN, OCN, NCS or Q--Y,whereQ is a single bond, (CF.sub.2).sub.r or O(CF.sub.2).sub.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: August 24, 1999
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: David Coates, Mark Goulding, Simon Greenfield, Volker Reiffenrath, Reinhard Hittich, Herbert Plach
  • Patent number: 5932138
    Abstract: The invention relates to 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, A.sup.1, A.sup.2, Z.sup.1, Z.sup.2, X, L and m are as defined in Claim 1.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: August 3, 1999
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Herbert Plach, Detlef Pauluth, Joachim Krause, Georg Weber, Volker Reiffenrath, Eike Poetsch
  • Patent number: 5891360
    Abstract: Novel phenylcyclohexanes of the formula I ##STR1## in which n is 0 to 7, Q.sup.1 and Q.sup.2 are H, or one of these radicals is alternatively CH.sub.3, r is 0, 1, 2, 3, 4 or 5, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or a single bond, X is F, Cl, --CF.sub.3, --CN, --OCF.sub.3 or --OCHF.sub.2, and Y and Z are each, independently of one another, H or F, with the proviso that, in the case where A is a single bond, Q.sup.1 =Q.sup.2 =H and simultaneously X=CN, Y and/or Z are F.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: April 6, 1999
    Assignee: Merck Patent Gesellschaft MIT Beschrankter
    Inventors: Andreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause