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: 5374374
    Abstract: Supertwist liquid-crystal displays having excellent properties are obtained using a nematic liquid-crystal mixture based on component A which containsone or more compounds of the formula IIa or IIb: ##STR1## one or more compounds of the formulae IIc to IIe: ##STR2## and one or more compounds of the formulae IIf to ##STR3## in which R, L.sup.1 and L.sup.2 and X are as defined herein.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: December 20, 1994
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Georg Weber, Herbert Plach, Volker Reiffenrath, Hiroki Yoshitake, Hiroshi Numata
  • Patent number: 5368772
    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: June 5, 1991
    Date of Patent: November 29, 1994
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Bernhard Rieger, Reinhard Hittich, Eike Poetsch, David Coates, Herbert Plach
  • Patent number: 5356560
    Abstract: 2-Fluoroperfluoroalkylcyclohexene derivatives of the formula I ##STR1## where R is an alkyl or alkenyl radical having up to 18 carbon atoms which is unsubstituted or substituted by CN or by at least one halogen and in which one or more non-adjacent CH.sub.2 groups may be replaced by a radical selected from the group consisting of --O--, --S--, --CO--, --O--CO--, --CO--O-- and --C.ident.C--,A.sup.1 and A.sup.2 are each, independently of one another,a) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N,b) a 1,4-cyclohexylene radical, in which one or two non-adjacent CH.sub.2 groups may be replaced by --O-- or --S--,c) a 1,4-cyclohexenylene, piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene or naphthalene-2,6-diyl radical,where the radicals a) and b) may be monosubstituted or polysubstituted by halogen atoms, cyano groups and/or methyl groups,Z.sup.1 and Z.sup.2 are each, independently of one another, --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --C.ident.C--, --CH.dbd.CH--, --OCH.sub.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: October 18, 1994
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Volker Reiffenrath, Herbert Plach
  • Patent number: 5350535
    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 X is fluorine, chlorine, CF.sub.3, OCF.sub.3 or OCHF.sub.2, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: September 27, 1994
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Bernhard Rieger, Reinhard Hittich, Volker Reiffenrath, Herbert Plach
  • Patent number: 5330679
    Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: July 19, 1994
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Sharp Corporation
    Inventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Bernhard Rieger, Hiroshi Numata, Reinhard Hittich, Herbert Plach, Thomas Geelhaar, Eike Poetsch, Volker Reiffenrath
  • Patent number: 5308541
    Abstract: The invention relates to novel halogenated benzene derivatives of the formula I ##STR1## in which n is 1 to 7 [sic], the rings A and B are each trans-1,4-cyclohexylene, or one of the rings A and B is alternatively 1,4-phenylene or 3-fluoro-1,4-phenylene, X is F, Cl, --CHF.sub.2, --CF.sub.3, --CN, --OCF.sub.3 or --OCHF.sub.2, Y and Z are each, independently of one another, H or F, r=1 or, in the case where s=1, B=trans-1,4-cyclohexylene and simultaneously X=CHF.sub.2, --CF.sub.3, --OCF.sub.3 or --OCHF.sub.2, r is alternatively 0, and s=1 or, in the case where B=1,4-phenylene or 3-fluoro-1,4-phenylene, s=0.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: May 3, 1994
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reinhard Hittich, Eike Poetsch, Volker Reiffenrath, Bernhard Rieger, Andreas Wachtler, David Coates, Herbert Plach
  • Patent number: 5308543
    Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: May 3, 1994
    Assignees: Merck Patent Gesellschaft mit besrankter Haftung, Sharp Corporation
    Inventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Bernhard Rieger, Hiroshi Numata, Reinhard Hittich, Herbert Plach, Thomas Geelhaar, Eike Poetsch, Volker Reiffenrath
  • Patent number: 5292454
    Abstract: Trifluorotoluene compounds of the formula I ##STR1## in which n is 1 to 12, and Q is ##STR2## are suitable as components of liquid-crystalline media.
    Type: Grant
    Filed: April 9, 1992
    Date of Patent: March 8, 1994
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Hans A. Kurmeier, Reinhard Hittich, Eike Poetsch, Volker Meyer, Herbert Plach, David Coates
  • Patent number: 5286411
    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 L is H or F, X is F, Cl, CF.sub.3, OCF.sub.3 or OCHF.sub.2, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.
    Type: Grant
    Filed: June 5, 1991
    Date of Patent: February 15, 1994
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Bernhard Rieger, Reinhard Hittich, Volker Reiffenrath, David Coates, Hans A. Kurmeier, Herbert Plach
  • Patent number: 5279763
    Abstract: A nematic liquid-crystal composition for active matrix displays has a high voltage holding ratio and extremely good low temperature stability.
    Type: Grant
    Filed: September 5, 1991
    Date of Patent: January 18, 1994
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Sharp Corporation
    Inventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Hiroshi Numata, Shohei Naemura, Bernhard Rieger, Herbert Plach
  • Patent number: 5271865
    Abstract: The invention relates to a liquid-crystalline mixture containing one or more compounds of the general formula ##STR1## in which R.sup.1 is straight-chain alkyl having 2 to 12 carbon atoms in which, in addition, one CH.sub.2 group may be replaced by --O-- or --CH.dbd.CH--, the ring A is 1,4-phenylene or trans-1,4-cyclohexylene, and r is 0 or 1, and one or more highly dielectrically positive compounds selected from the group comprising the compounds of the general formulae II, III and IV in a weight ratio between the compounds of the formula I and the compounds of the formulae II, III and IV of from 1:10 to 10:1: ##STR2## in which R.sup.2 has one of the meanings indicated for R.sup.1, and X and Y are each, independently of one another, CH or N, ##STR3## in which R.sup.2 has one of the meanings indicated for R.sup.1, and X' and Y' are CH.sub.2 or O, ##STR4## in which R.sup.2 has one of the meanings indicated for R.sup.1, r is as defined above, the rings A.sup.1 and A.sup.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: December 21, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reinhard Hittich, Herbert Plach, Volker Reiffenrath
  • Patent number: 5262085
    Abstract: Trifluoromethylene compounds of the formula I ##STR1## which can be used as components of liquid-crystalline media for liquid-crystal and electrooptical display elements.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: November 16, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Ekkehard Bartmann, Eike Poetsch, Ulrich Finkenzeller, Herbert Plach
  • Patent number: 5254698
    Abstract: Phenyldioxanes of the formula I ##STR1## wherein R.sup.1 is an alkyl or alkenyl residue each with up to 16 C atoms, wherein one or two non-adjacent CH.sub.2 groups of these residues may be replaced by --CO--O-- or --O--CO--,Q.sup.1 and Q.sup.2 are each independently ##STR2## L.sup.1 and L.sup.2 are each independently F or H, and Y is Cl, F, CN, CF.sub.3, OCF.sub.3 or OCF.sub.2 H,m and n is 0 or 1,are suitable as components of liquid crystal media.
    Type: Grant
    Filed: February 12, 1991
    Date of Patent: October 19, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: David Coates, Simon Greenfield, Graham Smith, Volker Reiffenrath, Joachim Krause, Herbert Plach
  • Patent number: 5213710
    Abstract: The invention relates to novel benzene derivatives of the formula I ##STR1## in which n is 0, 1, 2, 3, 4, 5, 6 or 7,Q is --O--, --CH.dbd.CH-- or a single bond,r is 0, 1, 2, 3, 4 or 5,s is 0, 1 or 2,X is F, Cl, OCHF.sub.2 or CF.sub.3,L is H or F, andA is ##STR2## Z, Z-Ar, Ar-Z, Z-Cyc in which Z is a single bond, --(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.4 --, Ar is 1,4-phenylene or biphenyl-4,4'-diyl and Cyc is trans-1,4-cyclohexylene.
    Type: Grant
    Filed: September 26, 1991
    Date of Patent: May 25, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Volker Reiffenrath, Reinhard Hittich, Herbert Plach
  • Patent number: 5209868
    Abstract: Disclosed are trifluoromethylcyclohexane derivatives of the formula I ##STR1## whereinR is an alkyl or alkenyl radical having up to 18 C atoms which is unsubstituted or substituted by CN or by at least one halogen, and in which one or more non-adjacent CH.sub.2 groups may be replaced by a radical selected from the group comprising --O--, --S--, --CO--, --O--CO--, --CO--O-- and --C.tbd.C--,A.sup.1 and A.sup.2 are each, independently of one another,a) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N,b) a 1,4-cyclohexylene radical, in which one or two non-adjacent CH.sub.2 groups may be replaced by --O-- or --S--,c) a 1,4-cyclohexenylene, piperidine-1,4-diyl, 1,4-bicyclo[2,2,2]-octylene or naphthalene-2,6-diyl radical,it being possible for the radicals a) and b) to be monosubstituted or polysubstituted by halogen atoms or cyano and/or methyl groups, ##STR2## Z.sup.1 and Z.sup.2 are each, independently of one another, --CO--O--, --O--CH--, --CH.sub.2 CH.sub.2 --, --CH(CN)--CH.sub.
    Type: Grant
    Filed: June 15, 1990
    Date of Patent: May 11, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Volker Reiffenrath, Eike Poetsch, Hans-Adolf Kurmeier, Georg Weber, Reinhard Hittich, Hans-Michael Kompter, Herbert Plach
  • Patent number: 5205962
    Abstract: The invention relates to pyridine derivatives of the formula I ##STR1## wherein R.sup.1, A.sup.1, E.sup.1, n, A.sup.2, Z.sup.2, X and Y have the meaning given in claim 1.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: April 27, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: David Coates, Simon Greenfield, Ian C. Sage, Robert Clemitson, Herbert Plach, Volker Reiffenrath
  • Patent number: 5204477
    Abstract: The invention relates to pyridine derivatives of the formula I ##STR1## wherein R.sup.1, A, Z, r, X, s and R.sup.2 have the meaning given in claim 1, and their use as components for liquid crystal media for electrooptical display elements based on the ECB effect.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: April 20, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Volker Reiffenrath, Eike Poetsch, Volker Meyer, Herbert Plach
  • Patent number: 5188759
    Abstract: The invention relates to a liquid crystalline medium having at least two components, where at least one component is a haloacetylene derivatives of the formula IR.sup.1 --A.sup.1 --Z.sup.1 --(A.sup.2 --Z.sup.2).sub.m --A.sup.3 --C.tbd.C--X IwhereinR.sup.1 is an alkyl or alkenyl radical having up to 15 carbon atoms which is unsubstituted or monosubstituted by CN, halogen or CF.sub.3, or such a radical wherein one or more CH.sub.2 groups is replaced, in each case independently of one another, by --S--, --O--, ##STR1## --CO--, --CO--O--, --O--CO-- or --O--CO--O-- in such a manner that sulfur and/or oxygen atoms are not linked directly to one another,A.sup.1, A.sup.2 and A.sup.3, in each case independently of one another, are(a) a trans-1,4-cyclohexylene radical or --S-- one or more non-adjacent CH.sub.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: February 23, 1993
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Ekkehard Bartmann, Reinhard Hittich, Herbert Plach, Ulrich Finkenzeller
  • Patent number: 5178790
    Abstract: Supertwist liquid crystal display elements with excellent steepness of the characteristic are obtained, if the nematic liquid crystal mixture satisfies the following conditions:a nematic phase range of at least 60.degree. C.,a viscosity of 30 mPa.s or lower, and.DELTA..epsilon./.epsilon..perp.<2.0, where .DELTA..epsilon. is the dielectric anisotropy and .epsilon..perp. is the dielectric constant in the direction of the short axis of the liquid crystal molecules.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: January 12, 1993
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Georg Weber, Herbert Plach, Volker Reiffenrath, Reinhard Hittich
  • Patent number: 5171469
    Abstract: The invention relates to a liquid-crystal matrix display having integrated nonlinear components and containing a liquid-crystal mixture having particularly high specific resistance.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: December 15, 1992
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Reinhard Hittich, Georg Weber, Herbert Plach, Andreas Wachtler, Bernard Scheuble