Patents by Inventor Kiyofumi Takahashi
Kiyofumi Takahashi 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: 5424116Abstract: An electrically conducting material is produced by a process which includes a step of treating a polyester substrate with an aqueous alkali solution to dissolve a portion of the polyester substrate into the solution. The resulting substrate is then reacted with a compound containing a group which can capture copper ion to introduce the copper ion capturing groups in the substrate. The copper ion-capturing group-containing substrate is thereafter treated with a source of copper ion and a sulfidizing agent to form copper sulfide bound to the polyester substrate.Type: GrantFiled: November 8, 1993Date of Patent: June 13, 1995Assignee: Nippon Sanmo Sensyoku Co., Ltd.Inventor: Kiyofumi Takahashi
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Patent number: 5269973Abstract: An electrically conductive material includes a polymeric substrate containing a group which can capture cuprous ion, a first sulfide consisting of copper sulfide, a second sulfide selected from silver sulfide and palladium sulfide, and a third sulfide selected from sulfides of Bi, Zn, In, V, Si, Sb, Al, Mn, Rb, Li, Tl, W, Ti, Cr, Mo, Y, Ge, Yb, La, Sm, Be, Sn, Zr, Mg, Ba, Nd, Cd and Ga, wherein the first, second and third sulfides are bound to the polymeric substrate. This material may be produced by treating the substrate with an aqeuous bath containing sources of the first, second and third metals and thiocyanate.Type: GrantFiled: August 13, 1991Date of Patent: December 14, 1993Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Kiyofumi Takahashi, Naokazu Takada, Shinji Tomibe
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Patent number: 5049684Abstract: An electrically conducting material including a cyanic group-containing material having adsorbed thereby copper sulfide. The cyanic group-containing material is in the form of powder or shaped body such as fiber, film, plate, rod or like and is formed of a synthetic polymer such as polyacrylonitrile or a polyamide having introduced thereinto cyanic groups; a naturally occurring polymeric substance such as cotton having introduced thereinto cyanic groups; or a low molecular compound such as phthalonitrile. The electrically conducting material may be prepared by treating the cyanic group-containing material with a source of monovalent copper ions and a sulfur-containing compound to form copper sulfide adsorbed by the cyanic group-containing material.Type: GrantFiled: September 3, 1982Date of Patent: September 17, 1991Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi
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Patent number: 4690854Abstract: An electrically conducting material including a polymeric substrate containing mercapto, thiocarbonyl, quaternary ammonium salt, amino or isocyanato groups, and copper sulfide bound to the polymeric substrate. The electrically conducting material may be prepared by treating the polymeric substrate with a source of monovalent copper ions and a sulfur-containing compound to form copper sulfide bound to the polymeric substrate.Type: GrantFiled: September 18, 1985Date of Patent: September 1, 1987Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi, Noboru Kato
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Patent number: 4681820Abstract: An electrically conducting material including a polymeric material having adsorbed sulfides of a first metal selected from copper, cobalt, tin, mercury and lead and of a second metal selected from silver, gold and elements of the platinum group. The polymeric material is in the form of powder or a shaped body such as a fiber, film or string and is formed of a synthetic polymer without cyanic groups such as a polyester or a polyamide or a naturally occurring polymeric substance such as silk or wool. The electrically conducting material may be prepared by treating the polymeric material with hydrogen sulfide, and then treating the resultant material having absorbed hydrogen sulfide with (a) a source of ions containing the first metal, (b) a source of ions containing the second metal and, optionally, (c) a sulfur-containing compound to form sulfides of the first and second metals adsorbed by the polymeric material.Type: GrantFiled: May 22, 1985Date of Patent: July 21, 1987Assignee: Nihon Sanmo Dyeing Co.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi
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Patent number: 4556507Abstract: An electrically conducting material including a polymeric material having adsorbed sulfides of a first metal selected from copper, cobalt, tin, mercury and of lead and a second metal selected from silver, gold and elements of the platinum group. The polymeric material is in the form of powder or a shaped body such as a fiber, film or string and is formed of a synthetic polymer without cyanic groups such as a polyester or a polyamide or a naturally occurring polymeric substance such as silk or wool. The electrically conducting material may be prepared by treating the polymeric material with hydrogen sulfide, and then treating the resultant material having adsorbed hydrogen sulfide with (a) a source of ions containing the first metal, (b) a source of ions containing the second metal and, optionally, (c) a sulfur-containing compound to form sulfides of the first and second metals adsorbed by the polymeric material.Type: GrantFiled: January 26, 1983Date of Patent: December 3, 1985Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi
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Patent number: 4410593Abstract: Electrically conducting acrylic and modacrylic fibers are prepared by subjecting the fibers to a first heat-treatment in a bath containing a copper compound and a reducing agent to adsorb monovalent copper ions within the fibers. The heat-treated fibers are washed thoroughly and then subjected to a second heat-treatment in the presence of a sulfur-containing compound to convert the adsorbed monovalent copper ions to copper sulfide. The electrically conducting fibers have superior conductivity which is not lost in repeated washings. The electrically conductive fibers can be dyed readily with cationic dyes without loss of electrical conductivity. The electrically conductive fibers of the present invention possess the touch and other physical characteristics of the starting acrylic or modacrylic fibers.Type: GrantFiled: September 3, 1980Date of Patent: October 18, 1983Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi
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Patent number: 4378226Abstract: Electrically conducting fibers are prepared by introducing cyanic groups into a synthetic or natural starting fiber and then subjecting the fiber to a heat treatment with a copper compound, a reducing agent capable of reducing bivalent copper ions to monovalent copper ions, and a sulfur-containing compound capable of discharging a sulfur atom or sulfur ion for reaction with monovalent copper ions adsorbed by the fiber so that copper sulfide is impregnated into the fibers. Heat treatment with the sulfur-containing compound can be simultaneous with or separate from heat treatment with the copper compound and reducing agent. The electrically conducting fibers of the present invention have excellent conductivity, improved washability and are not plagued by the problem of static charging associated with the starting synthetic or natural fiber.Type: GrantFiled: May 4, 1981Date of Patent: March 29, 1983Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinje Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi
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Patent number: 4364739Abstract: Electrically conducting acrylic and modacrylic fibers are prepared by subjecting the fibers to a first heat-treatment in a bath containing a copper compound and a reducing agent to adsorb monovalent copper ions within the fibers. The heat-treated fibers are washed thoroughly and then subjected to a second heat-treatment in the presence of a sulfur-containing compound to convert the adsorbed monovalent copper ions to copper sulfide. The electrically conducting fibers have superior conductivity which is not lost in repeated washings. The electrically conductive fibers can be dyed readily with cationic dyes without loss of electrical conductivity. The electrically conductive fibers of the present invention possess the touch and other physical characteristics of the starting acrylic or modacrylic fibers.Type: GrantFiled: March 31, 1981Date of Patent: December 21, 1982Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi
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Patent number: 4336028Abstract: A method of producing electrically conducting acrylic and acrylic-series fibers by treating the fibers in a treatment bath containing divalent copper ions, a reducing agent capable of reducing the divalent copper ions to monovalent copper ions and a sulfur-containing compound which provides sulfur which reacts with the monovalent copper ions to produce copper sulfide. The copper sulfide is adsorbed into the fiber and results in a fiber of superior conductivity and which posesses the touch and other physical characteristics of the starting fiber.Type: GrantFiled: July 15, 1981Date of Patent: June 22, 1982Assignee: Nihon Sanmo Dyeing Co., Ltd.Inventors: Shinji Tomibe, Reizo Gomibuchi, Kiyofumi Takahashi