Patents by Inventor Ta-Wei Fu
Ta-Wei Fu 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: 7253315Abstract: A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.Type: GrantFiled: March 24, 2005Date of Patent: August 7, 2007Assignees: Daikin Industries, Ltd., E. I. du Pont de Nemours and CompanyInventors: Ta-Wei Fu, Steven H. Swearingen, Takuya Ichida, Shigeyuki Yoshii
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Patent number: 7126016Abstract: A fluorocarboxylic acid preparation process continuously carries out acidification reaction treatment and washing treatment, and includes subjecting a fluorocarboxylate-containing aqueous solution to acidification reaction treatment in the presence of sulfuric acid so as to form a sulfate-containing fluorocarboxylic acid phase; and subjecting the fluorocarboxylic acid phase to washing treatment using an aqueous sulfuric acid solution.Type: GrantFiled: March 24, 2005Date of Patent: October 24, 2006Assignees: E.I. DuPont De Nemours and Company, Daikin Industries, Ltd.Inventors: Ta-Wei Fu, Steven H. Swearingen, Takuya Ichida, Shuji Itatani
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Publication number: 20050171381Abstract: A fluorocarboxylic acid preparation process continuously carries out acidification reaction treatment and washing treatment, and includes subjecting a fluorocarboxylate-containing aqueous solution to acidification reaction treatment in the presence of sulfuric acid so as to form a sulfate-containing fluorocarboxylic acid phase; and subjecting the fluorocarboxylic acid phase to washing treatment using an aqueous sulfuric acid solution.Type: ApplicationFiled: March 24, 2005Publication date: August 4, 2005Inventors: Ta-Wei Fu, Steven Swearingen, Takuya Ichida, Shuji Itatani
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Publication number: 20050165254Abstract: A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.Type: ApplicationFiled: March 24, 2005Publication date: July 28, 2005Inventors: Ta-Wei Fu, Steven Swearingen, Takuya Ichida, Shigeyuki Yoshii
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Patent number: 6720437Abstract: Fluorinated carboxylic acid, used as a surfactant in fluoropolymerization in aqueous media, can be recovered by scrubbing from the exhaust gas of the dryer during polymer drying and, after concentration and treatment with alumina, directly reused in fluoropolymerization in aqueous media.Type: GrantFiled: January 30, 2002Date of Patent: April 13, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Clay Woodward Jones, Ta-Wei Fu
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Publication number: 20020151748Abstract: Fluorinated carboxylic acid, used as a surfactant in fluoropolymerization in aqueous media, can be recovered by scrubbing from the exhaust gas of the dryer during polymer drying and, after concentration and treatment with alumina, directly reused in fluoropolymerization in aqueous media.Type: ApplicationFiled: January 30, 2002Publication date: October 17, 2002Inventors: Clay Woodward Jones, Ta-Wei Fu
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Patent number: 5569797Abstract: A process for preparing a hydrochlorofluorocarbon essentially free of olefinic impurities by selectively hydrogenating the olefinic impurities. The process may be controlled such that at least a portion of the hydrochlorofluorocarbon is converted into a fluorohydrocarbon.Type: GrantFiled: January 7, 1992Date of Patent: October 29, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ta-Wei Fu, Velliyur N. M. Rao
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Patent number: 4999099Abstract: An improved process for producing an anisotropic pitch product suitable for carbon fiber manufacture. A carbonaceous feedstock is heated at elevated temperature while passing a reactive sparging gas through the feedstock. The sparging gas is an oxidative gas such as a gaseous mixture containing a major proportion of inert gas and from about 0.1 to 2% by volume of oxygen. The process produces an anisotropic pitch having from 50 to 100% by volume mesophase which is suitable for producing good quality carbon fibers.Type: GrantFiled: January 30, 1986Date of Patent: March 12, 1991Assignee: Conoco Inc.Inventors: Ta-Wei Fu, Manfred Katz
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Patent number: 4998709Abstract: The present invention resides in improved graphite nipples which are suitable for connecting graphite electrodes. The graphite nipples are prepared by adding mesophase pitch-based carbon fibers into a typical nipple extrusion blend.Type: GrantFiled: April 19, 1990Date of Patent: March 12, 1991Assignee: Conoco Inc.Inventors: Robert R. Griffin, Keith M. Roussel, Ta-Wei Fu
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Patent number: 4959139Abstract: Binder pitch is prepared by combining a petroleum aromatic mineral oil thermal tar and super finely subdivided calcined premium coke particles. The petroleum aromatic mineral oil thermal tar is obtained by hydrotreating, thermally cracking and vacuum distilling an aromatic mineral oil. Additionally, the aromatic mineral oil thermal tar may be subjected to heat soaking.Type: GrantFiled: January 9, 1989Date of Patent: September 25, 1990Assignee: Conoco Inc.Inventors: Dave L. Blakeburn, II, Ta-Wei Fu, Keith M. Roussel
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Patent number: 4892641Abstract: An improved process for producing an anisotropic pitch product suitable for carbon fiber manufacture. A carbonaceous feedstock substantially free of mesophase pitch is heated at elevated temperature while passing an oxidatively reactive sparging gas such as air through the feedstock. The oxidatively treated feedstock, which remains substantially free of mesophase pitch, is then heated at a higher temperature in the presence of a non-oxidative sparging gas to produce an anisotropic pitch having from 50 to 100% by volume mesophase which is suitable for producing good quality carbon fibers.Type: GrantFiled: February 8, 1989Date of Patent: January 9, 1990Assignee: Conoco Inc.Inventors: Ta-Wei Fu, Manfred Katz
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Patent number: 4892642Abstract: An improved process for producing an anisotropic pitch product suitable for carbon fiber manufacture. A carbonaceous feedstock substantially free of mesophase pitch is heated at elevated temperature while passing an oxidatively reactive sparging gas such as air through the feedstock. The oxidatively treated feedstock, which contains isotropic pitch, is solvent fractionated to recover a solid pitch which on fusion becomes an anisotropic pitch product having from 50 to 100 percent by volume mesophase. In one aspect of the invention the carbonaceous feedstock is oxidatively treated in a melt phase at a lower temperature and the resulting isotropic pitch is then heated at a higher temperature in a melt phase in the presence or absence of a non-oxidative sparging gas prior to solvent fractionation.Type: GrantFiled: January 17, 1989Date of Patent: January 9, 1990Assignee: Conoco Inc.Inventors: Hugh E. Romine, Ta-Wei Fu
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Patent number: 4822479Abstract: Properties of premium coke are improved by coking the feed at a temperature lower than the normal coking temperature and thereafter subjecting the coke to a heat soak at substantially the same temperature as the temperature at which the coke was formed.Type: GrantFiled: November 27, 1987Date of Patent: April 18, 1989Assignee: Conoco Inc.Inventors: Ta-Wei Fu, Bruce A. Newman
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Patent number: 4758329Abstract: In a delayed premium coking process utilizing as feedstock an aromatic mineral oil having a high aromatic content and a low molecular weight, coke CTE is reduced and coke particle size is increased by sparging with a gas during the coking cycle.Type: GrantFiled: March 2, 1987Date of Patent: July 19, 1988Assignee: Conoco Inc.Inventors: Bruce A. Newman, Ta-Wei Fu
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Patent number: 4720338Abstract: A process for providing more uniform premium coke in a delayed coking operation by adding an aliphatic petroleum fraction to the premium coking feed during the latter part of the coking cycle. Preferably the aliphatic petroleum fraction is added gradually and is increased in quantity over the period of addition.Type: GrantFiled: November 3, 1986Date of Patent: January 19, 1988Assignee: Conoco Inc.Inventors: Bruce A. Newman, John K. Shigley, Ta-Wei Fu