Patents by Inventor Klaus Praefcke
Klaus Praefcke 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: 5969154Abstract: A liquid crystalline compound of formula ##STR1## wherein B and D are each independently of the other C.sub.6 -C.sub.24 alkyl, ##STR2## L is ##STR3## methyl or C.sub.10 -C.sub.18 alkyl, wherein R.sub.1 is C.sub.4 -C.sub.18 alkyl, with the proviso that when L is methyl, at least one of B and D is C.sub.6 -C.sub.24 alkyl;R2 is hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, cyano or nitro,R3, R4 and R5 are each independently of one another hydrogen, OR6, SR6, SeR6, --NHR6, --NR6R7, ##STR4## with the proviso that at least one of R3, R4 and R5 is not hydrogen, R6 is C.sub.7 -C.sub.37 alkyl, C.sub.7 -C.sub.37 alkylene or C.sub.5 -C.sub.18 alkyl which is interrupted by 1 to 6 hetero atoms selected from the group consisting of O, S and N,R7 is hydrogen or R9,R8 is hydrogen or C.sub.1 -C.sub.4 alkyl, andR9 is C.sub.1 -C.sub.12 alkyl, C.sub.2 -C.sub.12 alkylene or C.sub.3 -C.sub.12 alkyl which is interrupted by 1 to 6 hetero atoms selected from the group consisting of O, S and N.Type: GrantFiled: December 10, 1997Date of Patent: October 19, 1999Assignee: Ciba Specialty Chemicals CorporationInventors: Zhimin Hao, Abul Iqbal, Nancy Tebaldi, Klaus Praefcke
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Patent number: 4894181Abstract: Carbocyclic compounds of the formula I ##STR1## wherein Q is a benzene or cyclohexane ring or a naphthalene system, X is in each case --CH.sub.2 --(CH.sub.2).sub.p -- where it is also possible for one or two non-adjacent CH.sub.2 groups to be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O-- or --CH.dbd.CH--,p is 0, 1 or 2,A.sup.1 and A.sup.2 independently of one another are each a 1,4-phenylene group which is unsubstituted or monosubstituted or polysubstituted by halogen atoms and/or CH.sub.3 groups and/or CN groups and in which it would also be possible for one or more CH groups to be replaced by N atoms, a 1,4-cyclohexylene group wherein it would also be possible for one or two non-adjacent CH.sub.2 groups to be replaced by --O-- and/or --S--, a piperidine-1,4-diyl group or a 1,4-bicyclo[2.2.2]octylene group,Z is --CO--O--, --O--CO--, --O--, --CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CHCN--CH.sub.2 --, --CH.sub.2 --CHCN--, --CH.dbd.CH--, --CH.dbd.N--, --N.dbd.CH--, --NO.Type: GrantFiled: May 16, 1988Date of Patent: January 16, 1990Assignee: Merck Patent Gesellschaft Mit Beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Eike Poetsch
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Patent number: 4877220Abstract: Hexasubstituted cyclohexane compounds of the formula I ##STR1## in which Z.sup.1, Z.sup.2, Z.sup.3, X.sup.1, X.sup.2, A.sup.1, A.sup.2 and A.sup.3, p, R.sup.1 and R.sup.2, m and (n+m) have the meanings given in claim 1, are suitable as components of discotic liquid-crystalline phases.Type: GrantFiled: September 11, 1987Date of Patent: October 31, 1989Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Werner Stephan
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Patent number: 4758373Abstract: Carbocyclic compounds of the formula I ##STR1## wherein Q is a benzene or cyclohexane ring or a naphthalene system,X is in each case --CH.sub.2 --(CH.sub.2).sub.p -- wherein it is also possible for one or two non-adjacent CH.sub.2 groups to be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O-- or --CH.dbd.CH--,p is 0, 1 or 2,A.sup.1 and A.sup.2 independently of one another are each a 1,4-phenylene group which is unsubstituted or monosubstituted or polysubstituted by halogen atoms and/or CH.sub.3 groups and/or CN groups and in which it would also be possible for one or more CH groups to be replaced by N atoms, a 1,4-cyclohexylene group wherein it would also be possible for one or two non-adjacent CH.sub.2 groups to be replaced by --O-- and/or --S--, a piperidine-1,4-diyl group or a 1,4-bicyclo[2.2.2]octylene group,Z is --CO--O--, --O--CO--, --O--, --CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CHCN--CH.sub.2 --, --CH.sub.2 --CHCN--, --CH.dbd.CH--, --CH.dbd.N--, --N.dbd.CH--, --NO.Type: GrantFiled: March 24, 1986Date of Patent: July 19, 1988Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Eike Poetsch
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Patent number: 4734522Abstract: Six-membered ring compounds of the formula I ##STR1## wherein A is a benzene or cyclohexane ring,X.sup.1 to X.sup.6 independently of one another in each case are H, --OR, --COOR, --SR, --SOR, --SO.sub.2 R or, if A is a cyclohexane ring, also --O--COR, andR is in each case an alkyl group which has up to 15 C atoms and in which one or two CH.sub.2 groups can be replaced by O atoms, at least three of the substituents X.sup.1 to X.sup.6 being other than H,can be used as constituents of discotic liquid-crystal phases for liquid-crystal display elements.Type: GrantFiled: January 7, 1986Date of Patent: March 29, 1988Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Wadi Poules, Rudolf Eidenschink, Bernhard Scheuble
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Patent number: 4713196Abstract: Polymer compositions exhibiting liquid-crystalline phases contain chemically bonded mesogenic groups of the formula Ia and/or Ib: ##STR1## in which Q.sup.1 is H, alkyl or alkoxy having 1-5 C atoms, F, Cl, Br or CN,X.sup.1 to X.sup.5 each, independently of one another, are H or an alkyl group having up to 15 C atoms, in which it is also possible for one or two non-adjacent CH.sub.2 groups to be replaced by a group from the group comprising --O--, --S--, --O--CO--O--, O--CO--NH--, --CO--, --CO--O--, --CO--S--, --S--CO--, --SO-- and --SO.sub.2 --.Process for the preparation of polymer compositions of this type comprises the polymerization or grafting of suitable monomers.Polymer compositions of this type are used as substrates in electronics for the fiber and foil techniques.Type: GrantFiled: August 16, 1985Date of Patent: December 15, 1987Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Eike Poetsch, Claus P. Herz
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Patent number: 4631143Abstract: Triphenylene derivatives of the formula I ##STR1## wherein X.sup.1 to X.sup.6 are each, independently of one another, --SH, --SR, --SOR, --SO.sub.2 R or --S--COR, and each R is an alkyl group with up to 20 C atoms, it being possible for one or two CH.sub.2 groups to be replaced by O atoms and/or by unsubstituted or substituted vinylene or vinylidene groups, may be used as components of discotic liquid-crystalline phases.Type: GrantFiled: December 21, 1984Date of Patent: December 23, 1986Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Wadi Poules, Eike Poetsch
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Patent number: 4578210Abstract: Six-membered ring compounds of the formula I ##STR1## wherein A is a benzene or cyclohexane ring,X.sup.1 to X.sup.6 independently of one another in each case are H, --OR, --COOR, --SR, --SOR, --SO.sub.2 R or, if A is a cyclohexane ring, also --O--COR, andR is in each case an alkyl group which has up to 15 C atoms and in which one or two CH.sub.2 groups can be replaced by O atoms, at least three of the substituents X.sup.1 to X.sup.6 being other than H,can be used as constituents of discotic liquid-crystal phases for liquid-crystal display elements.Type: GrantFiled: September 13, 1984Date of Patent: March 25, 1986Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Bernd Kohne, Wadi Poules, Rudolf Eidenschink, Bernhard Scheuble
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Patent number: 4419263Abstract: Cyclohexylcarbonitrile derivatives of the formula I ##STR1## wherein Y is ##STR2## X is --COO--, --O--CO, --CH.sub.2 O--, --OCH.sub.2 -- or --CH.sub.2 CH.sub.2 --, and R is alkyl or alkoxy each of 1-12 carbon atoms, with the proviso that Y is not ##STR3## when X is --COO--; and all cyclohexyl rings are trans, are valuable liquid crystalline components.Type: GrantFiled: January 7, 1982Date of Patent: December 6, 1983Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Klaus Praefcke, Dietmar Schmidt, Rudolf Eidenschink