Patents by Inventor Bernard Gurtner
Bernard Gurtner 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: 5977379Abstract: The invention relates to the preparation of halogenated imides derived from hydrazine, a halogen and a dicarboxylic acid anhydride and capable of being employed as fireproofing agents for plastics.A dicarboxylic acid anhydride is halogenated with bromine, chlorine or a mixture thereof and then the product thus obtained is subsequently reacted with hydrazine. No prior purification or isolation of the intermediate halogenated anhydride is required.Type: GrantFiled: March 19, 1992Date of Patent: November 2, 1999Assignee: AtochemInventors: Evelyne Bonnet, Bernard Gurtner
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Patent number: 5220109Abstract: Halogenated organic species, e.g., chlorinated or brominated dioxins or dibenzofurans, PCBs, and the like, are consumed by contacting such species, at a temperature of greater than 220.degree. C., with a stoichiometric excess, relative to the halogen content thereof, of at least one alkali metal alcoholate.Type: GrantFiled: June 11, 1991Date of Patent: June 15, 1993Assignee: AtochemInventors: Raymond Commandeur, Elie Ghenassia, Bernard Gurtner
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Patent number: 5137948Abstract: The invention relates to the preparation of halogenated imides derived from hydrazine and halogenated dicarboxylic acid anhydride and which can be used as flameproofing agents for plastics. The condensation of hydrazine and halogenated dicarboxylic acid anhydride is carried out in an aqueous medium, at a temperature ranging from 40.degree. to 225.degree. C., with a molar ratio of anhydride/hydrazine equal to between 0.5 and 3, preferably between 1 and 2.Type: GrantFiled: July 22, 1988Date of Patent: August 11, 1992Assignee: AtochemInventors: Evelyne Bonnet, Andre Gagnieur, Bernard Gurtner
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Patent number: 5126498Abstract: The process for the separation of isomeric dichlorotoluenes, comprising the steps of:(a) passing a mixture containing isomeric dichlorotoluenes over a zeolite of the ZSM5 type having the composition (expressed in molar ratios) of (0.9+0.2) M.sub.2/n O:Al.sub.2 O.sub.3 : (10-100) SiO.sub.2 : z H.sub.2 O in which M is at least one cation selected from H, an alkali metal, an alkaline earth metal or a tetraalkylammonium cation; n is the valency of M; and z is between 0 and 40:(b) separating the non-adsorbed dichlorotoluenes;(c) contacting the zeolite containing the adsorbed isomers with an eluent; and(d) separating the isomers from the eluent.Type: GrantFiled: November 9, 1990Date of Patent: June 30, 1992Assignee: AtochemInventors: Sergio Carra, Renato Paludetto, Guiseppe Storti, Massimo Morbidelli, Bernard Gurtner, Raymond Commandeur
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Patent number: 5071707Abstract: Microcapsules containing a color-forming material and a solvent therefor, the solvent being a mixture of certain oligomeric isomers of benzylcumene and its higher homologues and a mixture of isomers of bis(isopropylphenyl) phenylmethane.Type: GrantFiled: March 26, 1990Date of Patent: December 10, 1991Assignee: AtochemInventors: Raymond Commandeur, Bernard Gurtner
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Patent number: 4957815Abstract: Polyarylalkane oligomer compositions consisting essentially of a mixture of isomers of xylyl-xylene and of higher homologues and a mixture of isomers of bis(dimethylphenyl)xylylene and of higher homologues; the method of making such compositions by first reacting toluene, xylene, or a mixture of toluene and xylene with chlorine in the presence of a radical generator, removing the unreacted toluene, and then subjecting the reaction product to the action of an inorganic halide or inorganic acid in the presence of xylene, and microcapsules containing color-forming material wherein the compositions are used as solvents for the color-forming material.Type: GrantFiled: July 1, 1988Date of Patent: September 18, 1990Assignee: Societe AtochemInventors: Raymond Commandeur, Bernard Gurtner
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Patent number: 4956120Abstract: Polyarylalkane oligomer compositions containing essentially of a mixture of isomers of benzylcumene and its higher homologues and a mixture of isomers of bis(isopropylphenyl)phenylmethane; the method of making such compositions by first reacting chlorine with toluene, xylene, or a mixture of toluene and xylene in the presence of a radical generator, removing the unreacted toluene and/or xylene, and then subjecting the reaction product to the action of an inorganic halide or of an inorganic acid in the presence of a benzene-related compound; and microcapsules containing color-forming material wherein the compositions are used as solvents for the color-forming material.Type: GrantFiled: July 1, 1988Date of Patent: September 11, 1990Assignee: AtochemInventors: Raymond Commandeur, Bernard Gurtner
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Patent number: 4912269Abstract: The invention relates to the preparation of perfluoroalkyl bromides or bromoperfluoroalkanes, CnF.sub.2n+1 -Br (n=1 to 20).Gaseous hydrogen bromide is reacted with a perfluoroalkanesulphonyl chloride, C.sub.n F.sub.2n+1 -SO.sub.2 Cl, in the presence of a catalyst consisting of a tertiary amine or phosphine or a quaternary ammonium or phosphonium salt, at a temperature ranging from 80.degree. to 200.degree. C.Type: GrantFiled: June 28, 1988Date of Patent: March 27, 1990Assignee: AtochemInventors: Gilles Drivon, Pierre Durual, Bernard Gurtner, Andre Lantz
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Patent number: 4894187Abstract: The invention relates to the preparation of halogenated imides derived from hydrazine and halogenated dicarboxylic acid anhydride and which can be used as flameproofing agents for plastics. The condensation of hydrazine and halogenated dicarboxylic acid anhydride is carried out in an aqueous medium, at a temperature ranging from 40.degree. to 225.degree. C., with a molar ratio of anhydride/hydrazine substantially equal to 2.Type: GrantFiled: February 8, 1988Date of Patent: January 16, 1990Assignee: AtochemInventors: Evelyne Bonnet, Andre Gagnieur, Bernard Gurtner
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Patent number: 4806684Abstract: The invention relates to the synthesis of bromofluoroacetic acids of formula: ##STR1## in which X is a hydrogen, fluorine, chlorine or bromine atom. These acids are prepared by reacting a compound of formula: ##STR2## dissolved in concentrated hydrobromic acid, X having the same meaning as above and R representing a hydrogen atom or an alkyl or aryl radical, with gaseous hydrogen bromide.Type: GrantFiled: September 3, 1986Date of Patent: February 21, 1989Assignee: AtochemInventors: Gilles Drivon, Bernard Gurtner
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Patent number: 4766262Abstract: A process for separating dichlorotoluene isomers from a mixture containing at least two dichlorotoluene isomers comprising(a) passing said mixture containing dichlorotoluene isomers through a mordenite having the following composition; in molar ratios:a H.sub.2 O: b M.sub.2/n O: Al.sub.2 O.sub.3 : (10-400 SiO.sub.2)in which M is hydrogen or at least one cation selected from an alkali metal or an alkaline-earth metal with the exception of cesium and rubidium, n is the valence of M, 0.7.ltoreq.a+b.ltoreq.1.1, and 0.ltoreq.b.ltoreq.0.2,(b) separating the non-adsorbed dichlorotoluenes from said mordenite,(c) contacting said mordenite containing the adsorbed isomers with a desorbent capable of separating said isomers from said mordenite, and(d) separating the desorbed isomers from the desorbent.Type: GrantFiled: November 3, 1986Date of Patent: August 23, 1988Assignee: AtochemInventors: Sergio Carra, Renato Paludetto, Giuseppe Storti, Massimo Morbidelli, Bernard Gurtner, Raymond Commandeur
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Patent number: 4701564Abstract: The invention relates to the preparation of brominated derivatives of diphenyl ether. This process includes preparing an underbrominated product and perbrominating the by-products of this reaction. This process is particularly suitable for the preparation of octabromodiphenyl ether and decabromodiphenyl ether.Type: GrantFiled: July 3, 1986Date of Patent: October 20, 1987Assignee: AtochemInventors: Robert Decaudin, Bernard Gurtner, Andre Gagnieur
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Patent number: 4597840Abstract: A process for the production of aluminum by the electrolysis of anhydrous aluminum chloride produced by the carbochlorination of alumina in a molten salt bath containing at least one alkali metal and/or alkaline-earth metal halide, comprising carrying out the carbochlorination of the alumina and electrolysis of the aluminum chloride in a continuous production loop using the molten salt bath emanating from carbochlorination as the electrolysis bath and the molten salt bath emanating from electrolysis as the carbochlorination bath.Type: GrantFiled: February 26, 1985Date of Patent: July 1, 1986Assignee: Aluminum PechineyInventors: Joseph Cohen, Bernard Gurtner, Yves Bertaud
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Patent number: 4523044Abstract: Polyarylalkane oligomer compositions comprising a mixture of two oligomers A and B, wherein oligomer A is a mixture of isomers of formula: ##STR1## with n1 and n2=0, 1 and 2, given that n1+n2.ltoreq.3; and oligomer B is a mixture of isomers of formula: ##STR2## with n'1, n"1 and n4=0, 1 and 2, n'2, n"2, n3, n'3 and n5=0 and 1, given that n'1+n"1+n'2+n"2+n3+n'3+n4+n5.ltoreq.2.The invention also comprises the process for the preparation of said oligomer compositions by the action of a halide or inorganic acid on a product of free-radical chlorination of toluene.Type: GrantFiled: September 13, 1984Date of Patent: June 11, 1985Assignee: AtochemInventors: Raymond Commandeur, Bernard Gurtner
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Process for the preparation of high purity aluminas starting from impure aluminum chloride solutions
Patent number: 4486402Abstract: Process for the preparation of high purity alumina containing less than 0.1 weight percent of residual chlorine starting from impure aluminum chloride solutions, which process comprises a crystallization step to provide aluminum chloride hexahydrate crystals having a diameter of from about 400 to about 4000 micrometers in the presence of hydrochloric acid; washing the aluminum chloride hexahydrate crystals so obtained with pure hydrochloric acid; and pyrohydrolyzing the washed crystals of aluminum chloride hexahydrate at a temperature of from about 700.degree. to about 1300.degree. C., in which pyrohydrolysis a gas is forced through a layer of the washed aluminum chloride hexahydrate so as to remove the gaseous reaction products while obviating any possible movement of the solid by the gas, the process particularly producing transition aluminas simultaneously having a specific surface area greater than 100 m.sup.2 /g and a chlorine content less than 0.1 weight percent.Type: GrantFiled: December 15, 1982Date of Patent: December 4, 1984Assignee: Produits Chimiques Ugine KuhlmannInventors: Bernard Gurtner, Robert Barral, Roland Bachelard