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).
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Patent number: 5378395Abstract: 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: GrantFiled: April 10, 1992Date of Patent: January 3, 1995Assignee: Merck Patent Gesellschaft mit Beschrankter HaftungInventors: Georg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans A. Kurmeier, Ekkehard Bartmann
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Patent number: 5374374Abstract: 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: GrantFiled: October 11, 1991Date of Patent: December 20, 1994Assignee: Merck Patent Gesellschaft mit Beschrankter HaftungInventors: Georg Weber, Herbert Plach, Volker Reiffenrath, Hiroki Yoshitake, Hiroshi Numata
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Patent number: 5368772Abstract: 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: GrantFiled: June 5, 1991Date of Patent: November 29, 1994Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Bernhard Rieger, Reinhard Hittich, Eike Poetsch, David Coates, Herbert Plach
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Patent number: 5356560Abstract: 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: GrantFiled: August 20, 1993Date of Patent: October 18, 1994Assignee: Merck Patent Gesellschaft Mit Beschrankter HaftungInventors: Volker Reiffenrath, Herbert Plach
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Patent number: 5350535Abstract: 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: GrantFiled: June 10, 1991Date of Patent: September 27, 1994Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Bernhard Rieger, Reinhard Hittich, Volker Reiffenrath, Herbert Plach
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Patent number: 5330679Abstract: 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: GrantFiled: March 3, 1992Date of Patent: July 19, 1994Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Sharp CorporationInventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Bernhard Rieger, Hiroshi Numata, Reinhard Hittich, Herbert Plach, Thomas Geelhaar, Eike Poetsch, Volker Reiffenrath
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Patent number: 5308543Abstract: 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: GrantFiled: March 3, 1992Date of Patent: May 3, 1994Assignees: Merck Patent Gesellschaft mit besrankter Haftung, Sharp CorporationInventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Bernhard Rieger, Hiroshi Numata, Reinhard Hittich, Herbert Plach, Thomas Geelhaar, Eike Poetsch, Volker Reiffenrath
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Patent number: 5308541Abstract: 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: GrantFiled: November 15, 1990Date of Patent: May 3, 1994Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Reinhard Hittich, Eike Poetsch, Volker Reiffenrath, Bernhard Rieger, Andreas Wachtler, David Coates, Herbert Plach
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Patent number: 5292454Abstract: 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: GrantFiled: April 9, 1992Date of Patent: March 8, 1994Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Hans A. Kurmeier, Reinhard Hittich, Eike Poetsch, Volker Meyer, Herbert Plach, David Coates
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Patent number: 5286411Abstract: 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: GrantFiled: June 5, 1991Date of Patent: February 15, 1994Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Bernhard Rieger, Reinhard Hittich, Volker Reiffenrath, David Coates, Hans A. Kurmeier, Herbert Plach
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Patent number: 5279763Abstract: A nematic liquid-crystal composition for active matrix displays has a high voltage holding ratio and extremely good low temperature stability.Type: GrantFiled: September 5, 1991Date of Patent: January 18, 1994Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, Sharp CorporationInventors: Kei Sasaki, Masako Okada, Shuichi Kohzaki, Fumiaki Funada, Hiroshi Numata, Shohei Naemura, Bernhard Rieger, Herbert Plach
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Patent number: 5271865Abstract: 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: GrantFiled: April 10, 1991Date of Patent: December 21, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Reinhard Hittich, Herbert Plach, Volker Reiffenrath
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Patent number: 5262085Abstract: 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: GrantFiled: July 19, 1991Date of Patent: November 16, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Ekkehard Bartmann, Eike Poetsch, Ulrich Finkenzeller, Herbert Plach
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Patent number: 5254698Abstract: 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: GrantFiled: February 12, 1991Date of Patent: October 19, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: David Coates, Simon Greenfield, Graham Smith, Volker Reiffenrath, Joachim Krause, Herbert Plach
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Patent number: 5213710Abstract: 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: GrantFiled: September 26, 1991Date of Patent: May 25, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Volker Reiffenrath, Reinhard Hittich, Herbert Plach
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Patent number: 5209868Abstract: 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: GrantFiled: June 15, 1990Date of Patent: May 11, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Volker Reiffenrath, Eike Poetsch, Hans-Adolf Kurmeier, Georg Weber, Reinhard Hittich, Hans-Michael Kompter, Herbert Plach
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Patent number: 5205962Abstract: 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: GrantFiled: February 6, 1991Date of Patent: April 27, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: David Coates, Simon Greenfield, Ian C. Sage, Robert Clemitson, Herbert Plach, Volker Reiffenrath
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Patent number: 5204477Abstract: 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: GrantFiled: November 21, 1990Date of Patent: April 20, 1993Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Volker Reiffenrath, Eike Poetsch, Volker Meyer, Herbert Plach
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Patent number: 5188759Abstract: 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: GrantFiled: February 1, 1991Date of Patent: February 23, 1993Assignee: Merck Patent Gesellschaft mit Beschrankter HaftungInventors: Ekkehard Bartmann, Reinhard Hittich, Herbert Plach, Ulrich Finkenzeller
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Patent number: 5178790Abstract: 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: GrantFiled: May 15, 1989Date of Patent: January 12, 1993Assignee: Merck Patent Gesellschaft mit beschraenkter HaftungInventors: Georg Weber, Herbert Plach, Volker Reiffenrath, Reinhard Hittich