Patents by Inventor Tsuyoshi Itou
Tsuyoshi Itou 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: 8235420Abstract: An intermediate shaft is provided which connects a steering shaft and a steering gear mechanism together via a universal joint, a shoulder bolt is provided which fastens one of yokes of the universal joint and a shaft portion of the intermediate shaft and on which a small diameter portion and a large diameter portion which are adapted to be brought into engagement with an outer circumferential surface of the shaft portion are formed sequentially from a distal end portion side, and the intermediate shaft has a bolt engagement recess portion which is formed on an outer circumferential surface of the shaft portion in such a manner as to extend in a direction which intersects an axial direction and which is adapted to be brought into engagement with the large diameter portion of the shoulder bolt and a dislocation preventive projecting portion which is formed on an outer circumferential surface of an end portion thereof, whereby a temporary fastening is implemented by bringing the small diameter portion of the shType: GrantFiled: April 25, 2008Date of Patent: August 7, 2012Assignee: NSK Ltd.Inventors: Seiichi Moriyama, Hiromichi Komori, Tsuyoshi Itou, Masaharu Igarashi, Yoshiro Udo
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Patent number: 8227167Abstract: The method for producing a developing agent according to the invention contains subjecting the toner material dispersion liquid to mechanical shearing to make the granular mixture into fine particles, thereby providing a dispersion liquid containing fine particles having a smaller particle diameter than a particle diameter of the granular mixture. The toner material dispersion liquid is subjected to mechanical shearing under a temperature of a glass transition point Tg of the binder resin or more and a pressure of 10 MPa or more, and the resulting dispersion liquid containing the fine particles is depressurized with two or more stages while maintaining the temperature of a glass transition point Tg of the binder resin or more and then cooled to a temperature of a glass transition point Tg of the binder resin or less.Type: GrantFiled: July 9, 2009Date of Patent: July 24, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Tsuyoshi Itou, Takayasu Aoki, Takashi Urabe, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Asumi Matsumoto
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Publication number: 20120082928Abstract: Disclosed is a decolorizable electrophotographic toner, including: a binder resin; and a colorant which contains at least a color developable compound and a color developing agent and is covered with an outer shell so as to have a capsule structure, wherein the number ratio of particles having an equivalent circle diameter of 0.6 ?m or more and 2.5 ?m or less of the toner when measured using a flow particle image analyzer after the toner is dispersed in an aqueous medium at a ratio of 0.08% by weight and the resulting dispersion is subjected to a stirring treatment in which stirring is performed at 5000 rpm for 30 minutes using a homogenizer (T-25 digital ULTRA-TURRAX (manufactured by IKA Japan K.K., provided with a shaft generator S25N-10G)) is 30% by number or less.Type: ApplicationFiled: October 3, 2011Publication date: April 5, 2012Applicants: TOSHIBA TEC KABUSHIKI KAISHA, THE PILOT INK CO., LTD., KABUSHIKI KAISHA PILOT CORPORATIONInventors: Masahiro Ikuta, Takahito Kabai, Takayasu Aoki, Tsuyoshi Itou
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Publication number: 20120082931Abstract: Disclosed is a producing method of a decolorizable toner, comprising dispersing a mixed composition containing encapsulated colorant particles which are particles containing a color developable compound and a color developing agent and coated with an outer shell, a polymerizable monomer, and a release agent in an aqueous medium, and subjecting the polymerizable monomer to suspension polymerization in the aqueous medium.Type: ApplicationFiled: August 31, 2011Publication date: April 5, 2012Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takahito Kabai, Takayasu Aoki, Masahiro Ikuta
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Publication number: 20110262857Abstract: An electrophotographic toner contains an electron donating color developable agent, an electron accepting color developing agent, and a polyester resin binder which is a polyester resin obtained by polycondensation of a carboxylic acid component and an alcohol component and has a crosslinked structure formed of a crosslinking component including at least either one of a trivalent or higher valent carboxylic acid and a trihydric or higher hydric alcohol, and is decolorized by heating.Type: ApplicationFiled: April 25, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Koji Imamiya, Tsuyoshi Itou
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Publication number: 20110262197Abstract: According to one embodiment, an image forming apparatus includes a mode setting section configured to set an operation mode in a manner that the image forming apparatus is operated in an erasing mode if an erasing operation is instructed, a supplying section configured to supply a medium on which the image formation is completed, and which is set in an designated or specified receiving section, a decoloring section configured to decolor the color of the formed image by carrying the medium to a heating section that includes at least heating and decoloring function, and a return section configured to return the operation mode to a predetermined mode except for the erasing mode from the erasing mode, when the last medium on which the image formation is completed and which is set in the receiving section is decolored.Type: ApplicationFiled: March 17, 2011Publication date: October 27, 2011Applicants: TOSHIBA TEC KABUSHIKI KAISHA, KABUSHIKI KAISHA TOSHIBAInventors: Koji Imamiya, Takayasu Aoki, Tsuyoshi Itou, Hiromichi Mitamura, Noboru Furuyama
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Publication number: 20110262850Abstract: There is provided a method for producing a toner that includes encapsulated erasable colored fine particles aggregated with fine particles that contain at least a binder resin and a release agent. The method includes: mixing a dispersion of erasable fine particles with an aggregating agent to form an aggregating agent-containing colored fine particle dispersion; and mixing the aggregating agent-containing colored fine particle dispersion with a fine particle dispersion that contains at least a binder resin and a release agent, so as to aggregate the aggregating agent-containing colored fine particles with the fine particles that contain at least a binder resin and a release agent. In this way, the encapsulated colored fine particles are prevented from being released from the resultant toner particles, and an erasable toner can be obtained that has a narrow particle size distribution and that produces less fogging.Type: ApplicationFiled: April 14, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki, Koji Imamiya, Masahiro Ikuta
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Publication number: 20110259237Abstract: A decolorizable inkjet ink includes a first particle that contains a color-forming compound, a color-developing agent, and a polar group-containing crystalline binder; and a second particle that contains a decoloring agent and a polar group-containing crystalline binder.Type: ApplicationFiled: April 25, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki, Koji Imamiya
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Publication number: 20110261108Abstract: According to one embodiment, a decolorizable water-based inkjet ink includes a color material, a solvent, and a nonionic surfactant. The color material contains a color developable compound and a color developing agent, and the solvent contains water and a water-soluble organic solvent. The nonionic surfactant is contained in the ink in an amount of 5 wt % or more of the total amount of the solvent.Type: ApplicationFiled: April 20, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Takafumi Hara, Tsuyoshi Itou
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Patent number: 8029962Abstract: A developing agent including a core containing an amorphous polyester resin and a fatty acid ester based wax, a shell provided on the surface of the core and containing a copolymer of an aromatic vinyl monomer and acrylic acid or an acrylic ester, and a coloring agent.Type: GrantFiled: May 13, 2008Date of Patent: October 4, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Motonari Udo, Masahiro Ikuta, Tsuyoshi Itou, Takashi Urabe, Takafumi Hara, Satoshi Araki, Yasuhito Noda
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Patent number: 8012661Abstract: A method for producing a developing agent contains mechanically shearing a mixture containing a polyester resin, a colorant and a releasing agent to form first fine particles, aggregating the first fine particles to form aggregated particles as a core, aggregating second fine particles containing a polyester resin onto the core to form a shell.Type: GrantFiled: October 29, 2008Date of Patent: September 6, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Motonari Udo, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Yasuhito Noda, Satoshi Araki, Masahiro Ikuta, Takafumi Hara
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Publication number: 20110212397Abstract: An electrophotographic toner, which is decolorized by heating and a glossiness after decolorization of which is less than 10, comprising an electron donating color former compound, an electron accepting color developing agent, and a polyester binder resin.Type: ApplicationFiled: April 29, 2011Publication date: September 1, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Yasuhito Noda, Koji Imamiya, Tsuyoshi Itou, Noboru Furuyama
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Publication number: 20110183248Abstract: According to one embodiment, a method of manufacturing a color erasable developing agent including preparing a dispersion containing a fine particle containing a leuco dye and a developer, a fine particle containing a color erasing agent, a toner binder resin fine particle and a medium, aggregating the fine particles in the medium, and heat fusing the aggregate to form a toner particle is provided.Type: ApplicationFiled: December 29, 2010Publication date: July 28, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takahito Kabai, Tsuyoshi Itou, Takayasu Aoki
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Patent number: 7981587Abstract: A method for producing a developing agent including heating a dispersion of a toner particle material containing a binder resin fine particle, a coloring agent particle and a dispersion medium at a temperature of a glass transition point of the binder resin or higher and adding a coagulating agent in the heated dispersion of a toner particle material to coagulate a toner material containing the binder resin fine particle and the coloring agent particle, thereby forming a coagulated particle is disclosed.Type: GrantFiled: October 26, 2007Date of Patent: July 19, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Masahiro Ikuta, Tsuyoshi Itou, Takashi Urabe, Motonari Udo, Satoshi Araki
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Publication number: 20110165507Abstract: An erasable toner is prepared by mixing colored particles containing at least a color former compound, a color developer agent and a binder resin with de-coloring particles having a melting point higher than the fixing temperature of the colored particles. By using this toner, a colored image is formed by electrostatically transferring a toner image onto a medium, and heating the toner image at a temperature lower than the melting point of the de-coloring particles to form a fixed toner image in a color developed state, and the color of the fixed image is erased by heating the image to a temperature not lower than the melting point of the de-coloring particles. In this toner, the color developing function and the color erasing function are assigned to different particles so that the functions are separated from each other, and therefore, the formation of an image in a color developed state and the erasure thereof can be reliably and promptly achieved.Type: ApplicationFiled: November 24, 2010Publication date: July 7, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki
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Publication number: 20110165509Abstract: Disclosed is a decolorable toner containing a binder resin and a coloring agent which contains a color former compound and a color developing agent and has a capsule structure such that it is covered with an outer shell, and having a volume average particle diameter of from 5.0 to 15.0 ?m and a number-based particle size distribution CV of 35% or less.Type: ApplicationFiled: December 27, 2010Publication date: July 7, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Junichi Ishikawa, Tsuyoshi Itou
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Patent number: 7960086Abstract: A coarse particle containing a polyester based resin and a coloring agent is added in an aqueous medium containing a surfactant, a basic substance and an inorganic water-soluble electrolyte, and dispersion and coagulation are carried out to form a toner particle.Type: GrantFiled: November 6, 2008Date of Patent: June 14, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Takashi Urabe, Takafumi Hara, Tsuyoshi Itou, Masahiro Ikuta, Motonari Udo, Yasuhito Noda, Satoshi Araki, Asumi Matsumoto
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Publication number: 20110123921Abstract: An electrophotographic toner contains an electron donating color former compound, an electron accepting color developing agent, and a polyester binder resin having a weight average molecular weight Mw of 6000 or more and 25000 or less, and the toner is decolorized by heating.Type: ApplicationFiled: November 19, 2010Publication date: May 26, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Yasuhito Noda, Koji Imamiya, Tsuyoshi Itou, Noboru Furuyama
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Patent number: 7901862Abstract: It is intended to provide a method includes the step of forming agglomerated particles by agglomerating fine particulate mixture containing a binder resin and a colorant. In the step of forming agglomerated particles, a cationic organic coagulating agent having an average molecular weight of from 1000 to 100000 is added to a liquid dispersion containing fine particles.Type: GrantFiled: October 2, 2008Date of Patent: March 8, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Tsuyoshi Itou, Takayasu Aoki, Takashi Urabe, Motonari Udo, Yasuhito Noda, Satoshi Araki, Masahiro Ikuta, Takafumi Hara
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Publication number: 20110014558Abstract: According to one embodiment, a method for producing a developing agent including aggregating fine particles of a toner material containing a binder resin and a coloring agent in a dispersion liquid in which the fine particles are dispersed in an aqueous medium to form aggregated particles, and washing the aggregated particles and drying the washed aggregated particles, forming toner particles is provided. An electrical conductivity of the toner particles is measured by a toner electrical conductivity evaluation method. A sample toner is prepared by adhering an additive to surfaces of the toner particles, and a content ratio of a sodium element to a carbon element in a region to which the additive is not adhered of the toner is measured. The washing of the toner particles is repeated until each of the measurement values becomes a predetermined reference value or less.Type: ApplicationFiled: July 8, 2010Publication date: January 20, 2011Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Masahiro Ikuta, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Motonari Udo, Satoshi Araki, Takafumi Hara, Yasuhito Noda, Taishi Takano, Yasuo Goto, Junichi Ishikawa