Patents by Inventor Maged A. Osman
Maged A. Osman 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: 5338483Abstract: Liquid crystal mixtures comprise one compound of the formula: ##STR1## wherein --A is selected from the group consisting of ##STR2## wherein R.sub.1 is independently C1-12 straight or branched alkyl or C1-12 straight or branched alkoxy and R.sub.2 is independently C1-12 straight or branched alkyl, X is selected from the group consisting of fluorine, chlorine, bromine, iodine and nitrile, and n is 1 or 2. The mixtures exhibit improved properties for image displays.Type: GrantFiled: January 21, 1993Date of Patent: August 16, 1994Assignee: Merck Patent GmbHInventors: Tuong Huynh-ba, Maged A. Osman
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Patent number: 5310501Abstract: Anisotropic compounds having a nematic phase have the formula ##STR1## wherein R.sup.1, R.sup.2, A, Z, X and n are described in the specification.Compounds having the defined lateral substituents on the rings have a reduced tendency to form smectic phases as compared with the compounds not having such lateral substituents.Type: GrantFiled: January 25, 1993Date of Patent: May 10, 1994Assignee: Merck Patent GmbHInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 5252252Abstract: New anisotropic compounds of the formula (1) are useful in liquid crystal mixtures for electrooptical displays; at least one of the end groups of the compounds (1) is an alkyl group which carries cyano or halogen in a terminal or non-terminal position. This offers advantages for longitudinal polarization and/or cross-polarization of the anisotropic compounds with the aid of the comparatively highly polarizing cyano or halogen substituents, in particular high clear points, low ##EQU1## values and/or negative .DELTA..epsilon. values.Type: GrantFiled: May 15, 1992Date of Patent: October 12, 1993Assignee: Merck Patent Gesellschaft mit beschraenkter HaftungInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 5227484Abstract: Anisotropic compounds having a nematic phase have the formula ##STR1## wherein A is a cyclic radical selected from the group consisting of ##STR2## Z is selected from the group consisting of a single bond, a --CH2CH2-- group,n is 1 or 2,R.sup.1 and R.sup.2 are selected from the group consisting of C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy.Type: GrantFiled: November 25, 1985Date of Patent: July 13, 1993Assignee: Merck Patent GmbHInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 5179101Abstract: Anisotropic compounds having a nematic phase have the formula ##STR1## wherein A is a cyclic radical selected from the group consisting of ##STR2## Z is selected from the group consisting of a single bond, a --CH2CH2-- group, a methyleneoxy group and an oxymethylene group,n is 1 or 2,p is 0, 1, or 2,r is 0 or 1,X is selected from the group consisting of fluorine, chlorine, bromine, iodine, nitrile and methyl,R.sup.1 and R.sup.2 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy and C.sub.1 -C.sub.12 -alkylamino and cyclic groups of the formulas ##STR3## wherein R.sup.3 through R.sup.6 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy, and C.sub.1 -C.sub.12 -alkylamino, and Z.sup.2 through Z.sup.Type: GrantFiled: February 9, 1990Date of Patent: January 12, 1993Assignee: Merck Patent GmbHInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 5120467Abstract: New anisotropic compounds of the formula (1) are useful in liquid crystal mixtures for electrooptical displays; at least one of the end groups of the compounds (1) is an alkyl group which carries cyano or halogen in a terminal or non-terminal position. This offers advantages for longitudinal polarization and/or cross-polarization of the anisotropic compounds with the aid of the comparatively highly polarizing cyano or halogen substituents, in particular high clear points, low ##EQU1## values and/or negative .DELTA..epsilon. values.Type: GrantFiled: April 6, 1989Date of Patent: June 9, 1992Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 5047170Abstract: Anisotropic compounds having a nematic phase have the formula ##STR1## wherein A is a cyclic radical selected from the group consisting of ##STR2## Z is selected from the group consisting of a single bond, a --CH.sub.2 CH.sub.2 -- group, a methyleneoxy group and an oxymethylene group,n is 1 or 2,p is 0, 1, or 2,r is 0 or 1,X is selected from the group consisting of fluorine, chlorine, bromine, iodine, nitrile and methyl,R.sup.1 and R.sup.2 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy and C.sub.1 -C.sub.12 -alkylamino and cyclic groups of the formulas ##STR3## wherein R.sup.3 through R.sup.6 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy, and C.sub.1 -C.sub.12 -alkylamino, and Z.sup.2 through Z.sup.Type: GrantFiled: December 23, 1988Date of Patent: September 10, 1991Assignee: Merck Patent GmbHInventors: Tuong Huynh-ba, Maged A. Osman
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Patent number: 4833228Abstract: A linear rodlike polyester of controlled rigidity and packing density which melts below 350.degree. C. and consists essentially of recurring units of the formula (1) ##STR1## in which A, B, C and D are the same or different cyclic moieties selected from the group consisting of 1,4-phenylene and 1,4-cyclohexylene; n is Zero or 1; Z.sup.1, Z.sup.2 and Z.sup.3 are the same or different and are selected from the group of bivalent links consisting of the covalent bond (--) and of linkages --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --OCH.sub.2 CH.sub.2 O--, --OCH.sub.2 OCH.sub.2 -- and --CH.sub.2 OCH.sub.2 O--; X.sup.1, X.sup.2, X.sup.3 and X.sup.Type: GrantFiled: March 17, 1988Date of Patent: May 23, 1989Inventor: Maged A. Osman
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Patent number: 4808333Abstract: Anisotropic compounds having a nematic phase have the formula ##STR1## wherein A is a cyclic radical selected from the group consisting of ##STR2## Z is selected from the group consisting of a single bond, a --CH2CH2-- group, a methyleneoxy group and an oxymethylene group,n is 1 or 2,p is 0, 1, or 2,r is 0 or 1,X is selected from the group consisting of fluorine, chlorine, bromine, iodine, nitrile and methyl,R.sup.1 and R.sup.2 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy and C.sub.1 -C.sub.12 -alkylamino and cyclic groups of the formulas ##STR3## wherein R.sup.3 through R.sup.6 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy, and C.sub.1 -C.sub.12 -alkylamino, and Z.sup.2 through Z.sup.Type: GrantFiled: July 24, 1985Date of Patent: February 28, 1989Assignee: Merck Patent GmbHInventors: Tuong Huynh-ba, Maged A. Osman
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Patent number: 4767729Abstract: A voltage-dependent ceramic resistance (varistor) based on ZnO and other addition elements, mostly in the form of oxides, is prepared, in that the addition elements are added to a suspension of ZnO powder in H.sub.2 O as chemical substances in the form of aqueous, mutually compatible, non-separating solutions of organic salts, acids, complex compounds and/or colloids, the suspension/aqueous solution formed in this manner is dried in the presence of air in a spray dryer, the free-flowing powder/granules prepared in this manner are pressed to a body and the pressed body is subjected to heat treatment, in order to decompose the organic substances, convert them into oxides, remove the decomposition products, and is finally sintered by successive heating to 650.degree. C., 900.degree. C. and 1100.degree. to 1300.degree. C. The water-soluble chemical substances to be used are preferably organic salts such as formates, acetates, lactates, tartrates, citrates, ammonium citrates and ammonium tartrates.Type: GrantFiled: April 29, 1986Date of Patent: August 30, 1988Assignee: BBC Brown, Boveri & Company, LimitedInventors: Maged A. Osman, Roger Perkins, Friedrich Schmuckle, Claus Schuler
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Patent number: 4723005Abstract: New anisotropic compounds of the formula (1) are useful in liquid crystal mixtures for electrooptical displays; at least one of the end groups of the compounds (1) is an alkyl group which carries cyano or halogen in a terminal or non-terminal position. This offers advantages for longitudinal polarization and/or cross-polarization of the anisotropic compounds with the aid of the comparatively highly polarizing cyano or halogen substituents, in particular high clear points, low .DELTA..epsilon./.epsilon..perp. values and/or negative .DELTA..epsilon. values.Type: GrantFiled: September 10, 1984Date of Patent: February 2, 1988Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 4686289Abstract: New anisotropic compounds with a cross-polarizing substituent have the formula (1) ##STR1## The increase in .epsilon..perp. is achieved by the polarizing group X, preferably the cyano group or a halogen atom, which is not laterally on the ring, as with the known compounds, but is on the bridge, that is to say is part of the main bridge bonding rings A and B to one another. Ring A has the formula (1a) or (1b) given herein and is always cycloaliphatic, while ring B can be identical to ring A or is an aromatic ring of the formula (1c) or (1d) herein. R.sup.1 and R.sup.2 are identical or different end groups of the formula (1e) herein.The radical X on the bridge causes less widening of the molecule than a radical X on a ring, which provides comparatively higher clear points and moreover enables aromatic rings to be omitted from the anisotropic compounds.Type: GrantFiled: February 25, 1986Date of Patent: August 11, 1987Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 4664840Abstract: Anisotropic compounds of the following formula: ##STR1## wherein ##STR2## is selected from the group consisting of ##STR3## Z represents a covalent bond or a carboxyl group --C(O)O--, R is selected from the group consisting of hydrogen, C.sub.1 -C.sub.12 alkyl, and C.sub.1 -C.sub.12 alkoxy and X.sup.2 and X.sup.3 may be the same or different and are selected from the group consisting of hydrogen, halogen, and nitrile, with the proviso that at least one of the groups X.sup.2 and X.sup.3 is not hydrogen, are useful as components of liquid crystal mixtures for elektrooptical twist cells.Type: GrantFiled: November 20, 1984Date of Patent: May 12, 1987Assignee: E. MerckInventor: Maged A. Osman
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Patent number: 4622163Abstract: New anisotropic compounds with a cross-polarizing substituent have the formula (1) ##STR1## The increase in .epsilon..perp. is achieved by the polarizing group X, preferably the cyano group or a halogen atom, which is not laterally on the ring, as with the known compounds, but is on the bridge, that is to say is part of the main bridge bonding rings A and B to one another. Ring A has the formula (1a) or (1b) given herein and is always cycloaliphatic, while ring B can be identical to ring A or is an aromatic ring of the formula (1c) or (1d) herein. R.sup.1 and R.sup.2 are identical or different end groups of the formula (1e) herein. The radical X on the bridge causes less widening of the molecule than a radical X on a ring, which provides comparatively higher clear points and moreover enables aromatic rings to be omitted from the anisotropic compounds.Type: GrantFiled: September 10, 1984Date of Patent: November 11, 1986Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Tuong Huynh-Ba, Maged A. Osman
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Patent number: 4559167Abstract: A varistor of metal oxides, predominantly zinc oxide (ZnO), is provided on its lateral surface between two contact faces, with a coating consisting at least partially of an organic polymer. In order to prevent rapid degradation in oxygen-free surroundings, the coating contains at least one oxygen barrier layer or is formed entirely as such a layer, which contains filler particles in an organic matrix material. The filler is here taken from the group comprising the following substances or groups of substances: synthetic mica, natural mica, vermiculite, micaceous iron ore, glass and other non-metallic inorganic substances present in the form of platelets or flakes; metal oxides, active part material in a pulverulent form and other oxygen-releasing inorganic substances. The organic matrix material is selected from the group comprising epoxide resins, alkyd resins, polyurethanes, silicone resins, unsaturated polyester resins and acrylates.Type: GrantFiled: November 29, 1984Date of Patent: December 17, 1985Assignee: BBC Brown, Boveri & Company, LimitedInventors: Elias Julke, Tony Kaiser, Maged A. Osman, Roger Perkins
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Patent number: 4514317Abstract: Anisotropic compounds having negative DC anisotropy and improved photochemical stability have the formula (1) given in patent claim 1; none of the benzene rings present in the molecule (1) is bonded directly to two oxygen atoms, as a result of which quinoidal bonding states which reduce the photochemical stability of anisotropic compounds in the case of benzene rings with two lateral nitrile groups are excluded.Type: GrantFiled: January 25, 1983Date of Patent: April 30, 1985Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Huynh-Ba Tuong, Stephen M. Kelly, Maged A. Osman
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Patent number: 4368135Abstract: Anisotropic compounds with negative or positive DCA and .DELTA.n.ltoreq.0.2 have the formula (1) ##STR1## in which R.sup.1 and R.sup.2 l are independently hydrogen, alkyl, alkoxy having 1 to 12 carbon atoms respectively, or one of R.sup.1 and R.sup.2 can represent cyclical fragment of formulae (1a) or (1b); ##STR2## the bridges Z.sup.1, Z.sup.2 and Z.sup.3 are identical or different and means covalent bonds or carboxyl or oxycarbonyl groups; R.sup.3 is hydrogen, alkyl or alkoxy group having 1 to 12 carbon atoms, respectively; X.sup.1 and X.sup.4 are independently hydrogen, halogen, nitrile or nitro, wherein at least one of X.sup.1 and X.sup.4 is not hydrogen when R.sup.2 represents a cyclical fragment of formula (1a) or (1b) and Z.sup.2 is a carboxyl group or Z.sup.3 is an oxycarbonyl group, respectively. Liquid crystal compositions are also disclosed.Type: GrantFiled: June 30, 1980Date of Patent: January 11, 1983Assignee: BBC, Brown, Boveri & Company, Ltd.Inventor: Maged A. Osman
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Patent number: 4361494Abstract: New anisotropic compounds suitable for use in LC-display devices are disclosed and claimed. The new compounds are cyclohexyl cyclohexylmethyl ethers of formula (1): ##STR1## in which X and Y are respectively hydrogen, alkyl group with 1 to 12 C-atoms, alkoxy group with 1 to 12 C-atoms, monoalkylamino group with 1 to 12 C-atoms, nitrile group, nitro group, halogen, or cyclic radical of formula (1a) or (1b): ##STR2## in which R.sup.1 and R.sup.2 represent hydrogen alkyl group with 1 to 12 C-atoms, alkoxy group with 1 to 12 C-atoms, monoalkylamino group with 1 to 12 C-atoms, nitrile group, nitro group or halogen, and Z.sup.1 and Z.sup.2 represent simple covalent bonds or grounds of the formulas --COO--, --OOC--, --CH.sub.2 O-- or --OCH.sub.2, with the requirement that only one of the groups X, Y can be a cyclicradical or formula (1a) or (1b). Also disclosed and claimed are LC-mixtures containing these compounds and methods for their synthesis.Type: GrantFiled: December 17, 1980Date of Patent: November 30, 1982Assignee: BBC Brown, Boveri, & Company, LimitedInventors: Maged A. Osman, Laszlo Revesz
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Patent number: 4349452Abstract: Anisotropic compounds of the formula (1) ##STR1## wherein X and Y are each hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, N-monoalkaylamine having 1 to 12 carbon atoms in the alkyl group, halogen, cyano, nitro, or a cyclic radical of the formula ##STR2## wherein R is hydrogen, halogen, cyano, nitro, C.sub.1 -C.sub.12 alkyl, or C.sub.1 -C.sub.12 alkoxy, Z.sup.1 is a --COO-- group or a --OOC-- group and Z.sup.2 may be the same as Z.sup.1 or a single convalent bond, with the proviso that:(a) only one of the groups X and Y is a cyclic radical, and(b) neither of the groups X or Y is hydrogen, bromine, or poperidino when the other is hydrogen, have low .DELTA.n-values without a greay tendency to form smectic phases and are useful in preparing liquid crystal devices.Type: GrantFiled: July 15, 1980Date of Patent: September 14, 1982Assignee: Merck Patent GmbHInventors: Maged A. Osman, Laszlo Revesz
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Patent number: 4299720Abstract: A liquid crystal mixture intended for electrooptical displays having no polarizers, consisting of:a nematic liquid crystal as the host phase;an optically active additive to give the host phase a cholesteric structure; andat least one pleochroic anthraquinone dye as the guest phase dissolved in the host phase, said anthraquinone dye having the formula: ##STR1## wherein R.sup.2, R.sup.3 and R.sup.4 are the same or different substituents and are selected from the group consisting of hydrogen, hydroxyl, amino, and short-chain N-monoalkylamino substituents; Y represents halogen, alkyl or alkoxy groups each with 1-16 carbon atoms, amino, alkylamino groups with 1-16 carbon atoms in the alkyl portion, nitro, or hydroxyl group; X represents halogen, amino or the group R.sup.5, wherein R.sup.5 is an alkyl group with 1-18 carbon atoms, an alkyl chain with 1-18 carbon atoms that is interrupted with one or two oxy groups or a group having the formula:--(CH.sub.2).sub.p --(O--C.sub.2 H.sub.4).sub.r --O--R.sup.Type: GrantFiled: November 9, 1979Date of Patent: November 10, 1981Assignee: BBC Brown, Boveri & Co., Ltd.Inventors: Maged A. Osman, Terry J. Scheffer, Laszlo Revesz, Jurgen Markert