Patents by Inventor Tsuneo Nakanishi
Tsuneo Nakanishi 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: 6703176Abstract: A toner contains at least a bonding resin and a coloring agent, and has a weight mean particle size from 5 &mgr;m to 12 &mgr;m; not less than 90% by number of particles not less than 3 &mgr;m have a circularity “a” not less than 0.900; a cut ratio Z and a weight mean size X of the toner are related as: cut ratio Z≦5.3×X; and a relationship of particles Y having a circularity of not less than 0.950 and a weight mean size X is Y≧e5.51×X−0.645 where X is 5 to 12 &mgr;m.Type: GrantFiled: May 23, 2002Date of Patent: March 9, 2004Assignee: Canon Kabushiki KaishaInventors: Takeshi Naka, Yuichi Mizoo, Satoshi Matsunaga, Masami Azuma, Takashige Kasuya, Tadashi Dojo, Tsuneo Nakanishi, Nene Shibayama, Katsuhisa Yamazaki, Yusuke Hasegawa
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Patent number: 6673506Abstract: In a toner production process having at least a kneading step, a pulverization step using a mechanical grinding machine, and a classification step, the grinding means comprises a mechanical grinding machine having at least a rotor which is a rotator attached to the center rotating shaft and a stator which is provided around the rotor, keeping a constant gap between the stator and the rotor surface, the grinding machine being so constructed that a circular space formed by keeping the gap stands airtight, and the surface of at least one of the rotor and the stator is coated by the plating of a chromium alloy containing at least chromium carbide.Type: GrantFiled: December 14, 2001Date of Patent: January 6, 2004Assignee: Canon Kabushiki KaishaInventors: Tsuneo Nakanishi, Hirohide Tanikawa, Tsutomu Onuma, Nobuyuki Okubo, Kaori Hiratsuka
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Patent number: 6630275Abstract: A magnetic toner is formed of magnetic toner particles each comprising at least a binder resin and a magnetic iron oxide. The magnetic toner is provided with improved developing performances by realizing an appropriate surface-exposure state of the magnetic iron oxide, which is represented by a wettability characteristic in methanol/water mixture liquids of the magnetic toner such that it shows a transmittance of 80% for light at a wavelength of 780 nm at a methanol concentration in a range of 65-75% and a transmittance of 20% at a methanol concentration in a range of 66-76%.Type: GrantFiled: March 13, 2002Date of Patent: October 7, 2003Assignee: Canon Kabushiki KaishaInventors: Kaori Hiratsuka, Hirohide Tanikawa, Tsutomu Onuma, Nobuyuki Okubo, Tsuneo Nakanishi
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Patent number: 6630277Abstract: Coarsely crushed toner particles comprising at least a binder resin and a colorant are effectively pulverized by a mechanical pulverizer including a generally cylindrical rotor rotating about an axis and a stator surrounding the rotor with a minute gap from the rotor. Each of the outer wall of the rotor and the inner wall of the stator is provided with a plurality of grooves which extend generally in parallel with the rotation axis of the rotor and are formed of a wave-shaped plurality of projections and intervening recesses. Each recess on at least one of the rotor and the stator is provided with a flat-shaped bottom between a forward corner and a rear corner adjacent a forward slope and a rear slope respectively, with respect to the rotation direction.Type: GrantFiled: November 15, 2001Date of Patent: October 7, 2003Assignee: Canon Kabushiki KaishaInventors: Takeshi Naka, Momosuke Takaichi, Kiyoshi Kanai, Tsuneo Nakanishi
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Patent number: 6589701Abstract: A dry magnetic toner is formed of magnetic toner particles comprising a binder resin and magnetic iron oxide particles. The magnetic toner is provided with excellent developing performances and transferability by controlling the presence of isolated iron-containing particles and containing a high percentage of spherical particles, the amount of which is controlled relative to the weight-average particle size of the magnetic toner and a content of particles of 3 &mgr;m or below in the magnetic toner.Type: GrantFiled: July 25, 2001Date of Patent: July 8, 2003Assignee: Canon Kabushiki KaishaInventors: Katsuhisa Yamazaki, Tsutomu Onuma, Nobuyuki Okubo, Tsuneo Nakanishi, Kaori Hiratsuka
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Patent number: 6586151Abstract: A toner manufacturing method includes grinding and classification to produce a toner containing a binder resin and a colorant with a weight mean particle size of 5 microns to 12 microns and sharp particle density distribution. The toner has a specific circularity, relationship between cut ratio and weight mean size, and relationship between circularity and weight mean size as disclosed in the specification.Type: GrantFiled: October 6, 2000Date of Patent: July 1, 2003Assignee: Canon Kabushiki KaishaInventors: Takeshi Naka, Yuichi Mizoo, Satoshi Matsunaga, Masami Azuma, Takashige Kasuya, Tadashi Dojo, Tsuneo Nakanishi, Nene Shibayama, Katsuhisa Yamazaki, Yusuke Hasegawa
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Patent number: 6537715Abstract: A toner has toner particles containing at least a binder resin, a colorant and a sulfur-containing compound selected from the group consisting of a sulfur-containing polymer and a sulfur-containing copolymer. The toner has a weight-average particle diameter of from 5 &mgr;m to 12 &mgr;m, and the toner has, in its particles of 3 &mgr;m or larger in diameter, at least 90% by number of particles with a circularity of 0.900 or higher, and has a specific relationship between the cut rate Z and the toner weight-average particle diameter X and a specific relationship between the number-based cumulative value Y of particles with a circularity of 0.950 or higher and the toner weight-average particle diameter X. Also disclosed are an image-forming method and a process cartridge which make use of the toner.Type: GrantFiled: July 26, 2001Date of Patent: March 25, 2003Assignee: Canon Kabushiki KaishaInventors: Yuichi Mizoo, Takeshi Naka, Masami Azuma, Takashige Kasuya, Tadashi Dojo, Tsuneo Nakanishi, Nene Shibayama, Katsuhisa Yamazaki, Yusuke Hasegawa
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Publication number: 20030054278Abstract: A toner contains at least a bonding resin and a coloring agent, and has the following characteristics (i) to (iv):Type: ApplicationFiled: May 23, 2002Publication date: March 20, 2003Inventors: Takeshi Naka, Yuichi Mizoo, Satoshi Matsunaga, Masami Azuma, Takashige Kasuya, Tadashi Dojo, Tsuneo Nakanishi, Nene Shibayama, Katsuhisa Yamazaki, Yusuke Hasegawa
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Publication number: 20030039908Abstract: A magnetic toner is formed of magnetic toner particles each comprising at least a binder resin and a magnetic iron oxide. The magnetic toner is provided with improved developing performances by realizing an appropriate surface-exposure state of the magnetic iron oxide, which is represented by a wettability characteristic in methanol/water mixture liquids of the magnetic toner such that it shows a transmittance of 80% for light at a wavelength of 780 nm at a methanol concentration in a range of 65-75% and a transmittance of 20% at a methanol concentration in a range of 66-76%.Type: ApplicationFiled: March 13, 2002Publication date: February 27, 2003Inventors: Kaori Hiratsuka, Hirohide Tanikawa, Tsutomu Onuma, Nobuyuki Okubo, Tsuneo Nakanishi
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Publication number: 20020182528Abstract: In a toner production process having at least a kneading step, a pulverization step using a mechanical grinding machine, and a classification step, the grinding means comprises a mechanical grinding machine having at least a rotor which is a rotator attached to the center rotating shaft and a stator which is provided around the rotor, keeping a constant gap between the stator and the rotor surface, the grinding machine being so constructed that a circular space formed by keeping the gap stands airtight, and the surface of at least one of the rotor and the stator is coated by the plating of a chromium alloy containing at least chromium carbide.Type: ApplicationFiled: December 14, 2001Publication date: December 5, 2002Inventors: Tsuneo Nakanishi, Hirohide Tanikawa, Tsutomu Onuma, Nobuyuki Okubo, Kaori Hiratsuka
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Patent number: 6458499Abstract: A toner is principally constituted by a binder resin, a colorant and a hydrocarbon wax. The hydrocarbon wax has a hydroxyl value (Hv) of 5-150 mgKOH/g and an ester value (Ev) of 1-50 mgKOH/g satisfying Hv>Ev. Further, the toner has a tetrahydrofuran-soluble content providing a gel-permeation chromatogram showing at least one peak in a molecular weight region of 3×103 to 5×104 and at least one peak or shoulder in a molecular weight region of 1×105 to 1×107.Type: GrantFiled: June 1, 2001Date of Patent: October 1, 2002Assignee: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Hirohide Tanikawa, Nobuyuki Okubo, Tsuneo Nakanishi, Katsuhisa Yamazaki, Kaori Hiratsuka
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Patent number: 6426169Abstract: A toner having a stable chargeability in various environments, a stable fixability over a wide temperature range and a resistance to sticking on an image-bearing member, is formed of a binder resin, a colorant and an azo iron compound as a charge control agent. The azo iron compound is formed from a monoazo compound having at least one alkyl group and two hydroxyl groups capable of bonding with an iron atom. The toner has a tetrahydrofuran-soluble content providing a gel-permeation chromatogram showing at least one peak in a molecular weight region of 3×103 to 5×104 and at least one peak or shoulder in a molecular weight region of above 5×104 and at most 1×107.Type: GrantFiled: October 30, 2000Date of Patent: July 30, 2002Assignee: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Hirohide Tanikawa, Nobuyuki Okubo, Yoshihiro Ogawa, Tsuneo Nakanishi, Katsuhisa Yamazaki, Kaori Hiratsuka
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Publication number: 20020086231Abstract: Coarsely crushed toner particles comprising at least a binder resin and a colorant are effectively pulverized by a mechanical pulverizer including a generally cylindrical rotor rotating about an axis and a stator surrounding the rotor with a minute gap from the rotor. Each of the outer wall of the rotor and the inner wall of the stator is provided with a plurality of grooves which extend generally in parallel with the rotation axis of the rotor and are formed of a wave-shaped plurality of projections and intervening recesses. Each recess on at least one of the rotor and the stator is provided with a flat-shaped bottom between a forward corner and a rear corner adjacent a forward slope and a rear slope respectively, with respect to the rotation direction.Type: ApplicationFiled: November 15, 2001Publication date: July 4, 2002Inventors: Takeshi Naka, Momosuke Takaichi, Kiyoshi Kanai, Tsuneo Nakanishi
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Publication number: 20020072006Abstract: A toner has toner particles containing at least a binder resin, a colorant and a sulfur-containing compound selected from the group consisting of a sulfur-containing polymer and a sulfur-containing copolymer. The toner has a weight-average particle diameter of from 5 &mgr;m to 12 &mgr;m, and the toner has, in its particles of 3 &mgr;m or larger in diameter, at least 90% by number of particles with a circularity of 0.900 or higher, and has a specific relationship between the cut rate Z and the toner weight-average particle diameter X and a specific relationship between the number-based cumulative value Y of particles with a circularity of 0.950 or higher and the toner weight-average particle diameter X. Also disclosed are an image-forming method and a process cartridge which make use of the toner.Type: ApplicationFiled: July 26, 2001Publication date: June 13, 2002Inventors: Yuichi Mizoo, Takeshi Naka, Masami Azuma, Takashige Kasuya, Tadashi Dojo, Tsuneo Nakanishi, Nene Shibayama, Katsuhisa Yamazaki, Yusuke Hasegawa
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Publication number: 20020051922Abstract: A dry magnetic toner is formed of magnetic toner particles comprising a binder resin and magnetic iron oxide particles. The magnetic toner is provided with excellent developing performances and transferability by controlling the presence of isolated iron-containing particles and containing a high percentage of spherical particles, the amount of which is controlled relative to the weight-average particle size of the magnetic toner and a content of particles of 3 &mgr;m or below in the magnetic toner.Type: ApplicationFiled: July 25, 2001Publication date: May 2, 2002Inventors: Katsuhisa Yamazaki, Tsutomu Onuma, Nobuyuki Okubo, Tsuneo Nakanishi, Kaori Hiratsuka
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Publication number: 20020034702Abstract: A toner is principally constituted by a binder resin, a colorant and a hydrocarbon wax. The hydrocarbon wax has a hydroxyl value (Hv) of 5-150 mgKOH/g and an ester value (Ev) of 1-50 mgKOH/g satisfying Hv>Ev. Further, the toner has a tetrahydrofuran-soluble content providing a gel-permeation chromatogram showing at least one peak in a molecular weight region of 3×103 to 5×104 and at least one peak or shoulder in a molecular weight region of 1×105 to 1×107.Type: ApplicationFiled: June 1, 2001Publication date: March 21, 2002Inventors: Tsutomu Onuma, Hirohide Tanikawa, Nobuyuki Okubo, Tsuneo Nakanishi, Katsuhisa Yamazaki, Kaori Hiratsuka
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Patent number: 5330858Abstract: A solid electrolyte type fuel cell power generation system includes a power generation module, an inverter, and a control device. The module includes a stack chamber, a combustion chamber, and a heat exchanging chamber, partitioned one from the other by partition walls, are provided. The stack chamber has a cell stack, an oxidant gas exhaust chamber for collecting an oxidant gas exhausted from the cell stack, and a fuel gas exhaust chamber for collecting a fuel gas exhausted from the cell stack. The oxidant gas exhaust chamber and the fuel gas exhaust chamber are communicated through a first exhaust gas passage provided in the partition wall. In the combustion chamber, the exhaust oxidant and fuel gases which have passed through the first exhaust gas passage are burnt and the resulting combustion gas is introduced into the heat exchanging chamber through the second exhaust gas passage provided in the partition wall.Type: GrantFiled: May 29, 1992Date of Patent: July 19, 1994Assignee: Fuji Electric Co., Ltd.Inventors: Hiroyuki Shundou, Tsuneo Nakanishi
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Patent number: 4910100Abstract: In a solid electrolyte fuel cell, reactant gases are directed by the reactant gas distributing means to flow radially between its central and peripheral portions and this obviates the need to provide an overall gas seal between the individual components of the fuel cell. A gas seal, if necessary at all, may be provided in selected areas. This permits the individual members of the fuel cell to freely slide with respect to one another during thermal expansion or contraction. The radial flow of reactant gas streams effectively reduces the travel path, and hence the concentration gradient, of the reactant gases. This contributes to the accomplishment of a solid electrolyte fuel cell having improved reliability and characteristics. As a further advantage, the discharged reactant gases may be burnt in a combustion chamber and a solid electrolyte fuel cell having a higher thermal efficiency can be realized by making use of the resulting heat of combustion.Type: GrantFiled: July 21, 1989Date of Patent: March 20, 1990Assignee: Fuji Electric Co., Ltd.Inventors: Tsuneo Nakanishi, Kazuo Koseki, Shinichi Maruyama, Hiroyuki Shundo
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Patent number: 4673123Abstract: A filler for welding a heat-resistant nickel-base alloy is disclosed. The filler comprises heat-resistant nickel-base alloy and an additive of 0.003 to 0.015 wt % boron based on the total weight of the filler metal. The filler may further comprise an other additive such as zirconium in the total amount of those two elements of 0.015 to 0.15 wt %, and the filler may further comprise the other additives such as lanthanum and cellium in the total amount of those fine elements of 0.018 to 0.15 wt % based on the total weight of the filler. The disclosed filler has improved creep properties at high temperatures and can be obtained without the defects inherent to conventional filler of heat-resistant nickel-base alloys.Type: GrantFiled: May 7, 1985Date of Patent: June 16, 1987Assignees: Nippon Welding Rod Co., Ltd., Fuji Electric Company Ltd., Fuji Electric Corporate ResearchInventors: Shigeo Shin, Tamao Takatsu, Teiichiro Saito, Akiyoshi Kikuchi, Tsuneo Nakanishi
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Patent number: 4319505Abstract: A pendulum-type flying shear having a speed range of a high speed to a low speed for shearing a hot rolled material having a large cross section in which there are provided vertically movable upper and lower cutting blades within a frame mounted on a crank shaft and the blades are moved towards and away from each other to shear the material while the frame is oscillated. Particularly, while the crank shaft is rotated at a constant speed, the oscillating speed of the frame is synchronized with the speed of movement of the material to be sheared and speed synchronizing apparatus including a gear device and the like is interposed between the oscillating device and the driving device so that a good shearing performance can be obtained with a small capacity of the driving device.Type: GrantFiled: April 30, 1980Date of Patent: March 16, 1982Assignee: Hitachi, Ltd.Inventors: Yukio Otake, Yuji Kikuchi, Tsuneo Nakanishi, Keiji Miyakozawa