Patents by Inventor Luigi Giuffre
Luigi Giuffre 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: 4895634Abstract: A porous separator, to be used in electrolyzers for producing hydrogen and oxygen by water electrolysis, consists of a fabric or felt entirely made of polyphenylene sulfide (PPS). In order to reduce the voltage drop caused by the separator, the PPS polymeric chain can be made ionically active by the presence thereon of polar groups, such as sulfonic, carboxylic or phosphonic groups.The method for producing the separator comprises the preparation, according to conventional weaving or felt manufacturing techniques, of a fabric or felt entirely made of PPS and the subsequent functionalization for introducing polar groups in the polymeric chain. The functionalization can be carried out either on the starting material, such as PPS polymer powder or flakes, or in any other step of the production of fabric or felt.Type: GrantFiled: June 14, 1988Date of Patent: January 23, 1990Assignee: Fratelli Testori S.p.A.Inventors: Luigi Giuffre, Giovanni Modica, Alberto Pagani, Giancarlo Imarisio
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Patent number: 4663012Abstract: Separator film for alkaline electrolysis and method for making thereof, wherein said separator film includes an aromatic polymer and polytitanic acid.Type: GrantFiled: January 7, 1986Date of Patent: May 5, 1987Assignee: European Atomic Energy CommunityInventors: Luigi Giuffre, Giovanni Modica, Silvia Maffi, Ezio Tempesti, Giancarlo Pierini
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Patent number: 4391758Abstract: An improved process for the preparation of methyl isocyanate comprising reacting methyl carbamoyl chloride with an acid acceptor selected from the group consisting of 1,3-dimethylurea, urea, alkyl ureas and biuret in an organic solvent in which the acid acceptor is soluble but in which the hydrochloride salt thereof is insoluble, separating the acid acceptor hydrochloride from the liquid phase, recovering methyl isocyanate by distillation from the liquid phase, and thermally decomposing acid acceptor hydrochloride to at least a partially free acid acceptor which can preferably be used as a starting material for the production of methyl isocyanate.Type: GrantFiled: April 19, 1982Date of Patent: July 5, 1983Inventors: Placido M. Spaziante, Luigi Giuffre
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Patent number: 4384999Abstract: A novel process for the preparation of alkyl isocyanates comprising reacting COX.sub.2 and an alkyl amine hydrohalide of the formulaR-NH.sub.2.HX Iwherein R is alkyl of 1 to 3 carbon atoms and X is a halogen either under pressure in an inert organic solvent or under atmospheric pressure in a high boiling organic solvent to form the corresponding alkyl carbamoyl halide, reacting the latter in an organic solvent with an urea of the formula ##STR1## wherein X' is selected from the group consisting of oxygen and sulfur, R.sub.1 and R.sub.3 are individually selected from the group consisting of alkyl of 1 to 7 carbon atoms, cycloalkyl of 4 to 6 carbon atoms and phenyl and R.sub.2 and R.sub.4 are individually selected from the group consisting of hydrogen, alkyl of 1 to 7 carbon atoms, cycyloalkyl of 4 to 6 carbon atoms and phenyl to obtain the corresponding alkyl isocyanate.Type: GrantFiled: October 9, 1980Date of Patent: May 24, 1983Inventors: Placido M. Spaziante, Luigi Giuffre, Giancarlo Sioli, Mirco Fornaroli
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Patent number: 4295952Abstract: Cationic membranes permeable to ions but fluid impermeable comprising a partly sulfonated terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2-vinylpyridine, 4-vinylpyridine and acrylic acid, the degree of sulfonation varying through the membrane cross-section from a maximum or the anodic surface to a minimum at the cathodic surface, their preparation, their use in electrolysis cells and electrochemical processes.Type: GrantFiled: March 24, 1980Date of Patent: October 20, 1981Assignee: Oronzio deNora Impianti Elettrochimici S.p.A.Inventors: Oronzio de Nora, Luigi Giuffre, Giovanni Modica
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Patent number: 4288382Abstract: Adducts of low boiling isocyanates with boron compounds selected from the group consisting of polyol borates and metaboric acid which decompose on heating to give the low boiling isocyanates as a condensible vapor; as well as the method of making the adducts and the method of storing and transporting low boiling isocyanates employing said adducts.Type: GrantFiled: October 10, 1979Date of Patent: September 8, 1981Assignee: Vertac, Inc.Inventors: Luigi Giuffre, Placido M. Spaziante
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Patent number: 4285876Abstract: Adducts of low boiling isocyanates with .beta.-diketones which decompose on heating to give the low boiling isocyanates as a condensible vapor; as well as the method of making the adducts and the method of storing and transporting low boiling isocyanates employing said adducts.Type: GrantFiled: October 10, 1979Date of Patent: August 25, 1981Assignee: Vertac, Inc.Inventors: Luigi Giuffre, Placido M. Spaziante
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Patent number: 4281184Abstract: Production of monochloroacetic acid with a minimum of polychlorinated derivatives in a two stage process by reaction of acetic anhydride and hydrogen chloride at a low temperature to produce a solution of acetyl chloride in acetic acid and chlorinating the said solution at a higher temperature which may be effected in a continuous manner.Type: GrantFiled: March 22, 1978Date of Patent: July 28, 1981Assignee: Fondazione deNoraInventors: Placido Spaziante, Giancarlo Sioli, Luigi Giuffre
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Patent number: 4262252Abstract: A measuring electrode for determining the concentration of aqueous sulfuric acid solutions comprising a lead electrode activated by anodic polarization in aqueous sulfuric acid and a process of determining the state of charge of a lead-acid battery.Type: GrantFiled: May 22, 1978Date of Patent: April 14, 1981Assignee: Panclor S.A.Inventors: Placido M. Spaziante, Luigi Giuffre, Giovanni Modica
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Patent number: 4246090Abstract: Cationic membranes permeable to ions but fluid impermeable comprising a partly sufonated terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2-vinylpyridine, 4-vinylpyridine and acrylic acid, the degree of sulfonation varying through the membrane cross-section from a maximum at the anodic surface to a minimum at the cathodic surface, their preparation, their use in electrolysis cells and electrochemical processes.Type: GrantFiled: February 22, 1979Date of Patent: January 20, 1981Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Oronzio de Nora, Luigi Giuffre, Giovanni Modica
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Patent number: 4236979Abstract: Porous and electrolyte permeable composite diaphragms for electrolysis cells comprising a chemically inert, fibrous porous matrix or substrate impregnated with a copolymer of divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine, method of electrolysis of an electrolyte using the said diaphragms and an electrolysis cell containing said diaphragms.Type: GrantFiled: February 22, 1979Date of Patent: December 2, 1980Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Oronzio de Nora, Luigi Giuffre, Giovanni Modica
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Patent number: 4221642Abstract: Novel membranes for electrochemical cells permeable to anions, fluid impervious and resistant to halogens and acidic and oxidizing environments comprised of copolymers of (1) divinylbenzene or halogenated vinyl monomers and (2) at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine with the copolymers being optionally N-alkylated or N-arylated, processes for preparing the said membranes and electrochemical cells and processes using the said membranes.Type: GrantFiled: February 22, 1979Date of Patent: September 9, 1980Assignee: Oronzio deNora Impianti Elettrochimici S.p.A.Inventors: Oronzio De Nora, Luigi Giuffre, Giovanni Modica
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Patent number: 4215009Abstract: A novel method of reducing metal impurities in aqueous alkali metal halide solutions, especially alkaline earth metal ions, and to novel organic solvent compositions having a synergistic activity for removal of metal impruties from aqueous solutions.Type: GrantFiled: September 7, 1978Date of Patent: July 29, 1980Assignee: Oronzio deNora Impianti Elettrochimici S.p.A.Inventors: Placido M. Spaziante, Luigi Giuffre, Aldo Castoldi, Giancarlo Sioli
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Patent number: 4208455Abstract: A method of shaping an organic polymer insoluble in a polar solvent comprising reacting an insoluble organic polymer containing at least one Lewis acid electron attracting group or Lewis basic electron donating group with a sufficient amount of a lower alkylene oxide to alkoxylate the Lewis group and form an alkoxylated product soluble or easily dispersible in a polar solvent, dissolving or dispersing the alkoxylated product in a polar solvent, shaping the alkoxylated product into the desired form by applying the solution or dispersion to a support and removing the polar solvent, and hydrolyzing the alkoxylated product to obtain the original polymer in the desired form. Products made by the process include self-supporting polymeric films and porous diaphragms for electrolytic cells made by impregnating suitable porous supports with the alkoxylated product.Type: GrantFiled: October 23, 1978Date of Patent: June 17, 1980Assignee: Oronzio deNora Impianti Elettrochimici S.p.A.Inventors: Luigi Giuffre, Placido M. Spaziante, Vittorio Pozzi, Giovanni Modica
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Patent number: 4201647Abstract: A novel measuring electrode for determination of the concentration of anionic species in aqueous solutions by measuring the potential difference between the measuring electrode and a reference electrode comprising a body provided with an outer surface comprised of graphite or carbon black dispersed in a chemically inert matrix, said electrode being preactivated by anodic polarization in an aqueous alkaline or acid solution, the process of activating the said electrode and a method of ascertaining the charge state of an electric accumulator by determining the strength of the electrolyte therein.Type: GrantFiled: May 22, 1978Date of Patent: May 6, 1980Assignee: Panclor S.A.Inventors: Placido M. Spaziante, Luigi Giuffre, Giovanni Modica
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Patent number: 4186076Abstract: Porous and electrolyte permeable composite diaphragms for electrolysis cells comprising a chemically inert, fibrous porous matrix or substrate impregnated with a copolymer of divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine, method of electrolysis of an electrolyte using the said diaphragms and an electrolysis cell containing said diaphragms.Type: GrantFiled: February 22, 1979Date of Patent: January 29, 1980Assignee: Oronzio deNora Impianti Elettrochimici S.p.A.Inventors: Oronzio de Nora, Luigi Giuffre, Giovanni Modica
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Patent number: 4144227Abstract: Novel sulfonated copolymers formed by copolymerization of a halogenated monomer containing at least one fluorine atom and a monomer of the formula ##STR1## wherein X is an electron attracting group activating the hydrogen atom in the .alpha.-position so that the hydrogen may be replaced with a sulfonic group and Y is selected from the group consisting of hydrogen, methyl and ethyl and their preparation, novel diaphragms made therefrom, a diaphragm cell equipped with a diaphragm made of said sulfonated copolymer and to a method of electrolysis.Type: GrantFiled: February 4, 1977Date of Patent: March 13, 1979Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Luigi Giuffre, Vittorio DE Nora, Placido Spaziante
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Patent number: 4132819Abstract: A method of shaping an organic polymer insoluble in a polar solvent comprises reacting an insoluble organic polymer containing at least one Lewis acidic electron attracting group or Lewis basic group with a sufficient amount of a lower alkylene oxide to alkoxylate the Lewis group and form an alkoxylated product soluble or easily dispersible in a polar solvent, dissolving or dispersing the alkoxylated product in a polar solvent, shaping the alkoxylated product into the desired form by applying the solution or dispersion to a support and removing the polar solvent, and hydrolyzing the alkoxylated product to obtain the original polymer in the desired form. Products made by this process include self-supporting polymeric films and porous diaphragms for electrolytic cells made by impregnating suitable porous supports with the alkoxylated product.Type: GrantFiled: November 17, 1976Date of Patent: January 2, 1979Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Luigi Giuffre, Placido M. Spaziante, Vittorio Pozzi, Giovanni Modica
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Patent number: 4060473Abstract: Novel sulfonated copolymers formed by copolymerization of a halogenated monomer containing at least one fluorine atom and a monomer of the formula ##STR1## wherein X is an electron attracting group activating the hydrogen atom in the .alpha.-position so that the hydrogen may be replaced with a sulfonic group and Y is selected from the group consisting of hydrogen, methyl and ethyl and their preparation, novel diaphragms made therefrom, a diaphragm cell equipped with a diaphragm made of said sulfonated copolymer and to a method of electrolysis.Type: GrantFiled: November 14, 1975Date of Patent: November 29, 1977Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Luigi Giuffre, Vittorio DE Nora, Placido Spaziante
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Patent number: 4056447Abstract: Novel composite material comprising a supporting matrix of inert fibers impregnated with a halogenated copolymer of divinyl benzene and styrene containing sulfonic acid groups copolymerized directly on the fiber material in the absence of a solvent which remains dimensionally stable under electrolysis conditions in diaphragm cells and the method of making them and the method of electrolyzing alkali metal halide solutions in a diaphragm cell equipped with a diaphragm made of said impregnated composite diaphragm material.Type: GrantFiled: December 6, 1976Date of Patent: November 1, 1977Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Luigi Giuffre, Vittorio De Nora, Placido Spaziante